CHANGELOG.md

Changelog

All notable changes to this project will be documented in this file.

[Unreleased]

Added

• ATA has been added to the list of known telescopes.

[3.1.2] - 2024-11-21

Added

• New keyword check_kw to new_uvdata that lets the user specify options to the checking of the created object.
• New keyword all_times_unique to calc_app_coords that short-cuts the calculation when it is known that all input times are unique.
• New convenience methods on BeamInterface to simplify the handling of analytic vs UVBeam objects.
• Added support for partial read for MWA correlator FITS files.
• Added antenna_names, time_range, lsts and lst_range parameters to UVFlag.select to match UVData and UVCal select methods.

Changed

• Made it possible to not return the interp_basis_vector array from beam interpolators.

Fixed

• Initialization of analytic beams with single feed.

[3.1.1] - 2024-10-28

Fixed

• New test failures related to incorrect tolerances for floating point comparisons in tests. Floating point comparisons have been updated throughout the code base.

[3.1.0] - 2024-10-22

Added

• New analytic beam classes: AiryBeam, GaussianBeam, ShortDipoleBeam, UniformBeam that support evaluating either the efield or power beam in any direction and frequency.
• A new BeamInterface class that provides a unified interface to UVBeam and analytic beam objects to get beam responses in any direction and frequency (via interpolation or evaluation as appropriate).
• New optional spatial interpolation method, interpolation_function="az_za_map_coordinates" that improves the linear interpolation speed for data in az_za coordinates.
• New UVParameter pol_convention on UVData and UVCal. This specifies the convention assumed for converting linear to stokes polarizations -- either "sum" or "avg". Also added to uvcalibrate to apply from the UVCal to the UVData.
• New ignore_telescope_param_update_warnings_for function that globally ignores warnings for specific telescopes.
• New .telescope cached property on the FastUVH5Meta object that auto-creates a telescope object from the metadata.
• UVData.get_enu_data_ants method to get east, north, up positions only for antennas with data.

Changed

• Updated minimum optional dependency versions: lunarsky>=0.2.5, pytest>=8.2.0

Fixed

• A bug in the MWA beam reader that resulted in the wrong polarization response (the azimuthal-aligned response was swapped with the zenith angle-aligned response).
• A bug in reading UVH5 files with antenna names saved as variable length strings that was introduced in v3.0.0.

[3.0.0] - 2024-7-1

Added

• Several new methods on Telescope objects, including the classmethods from_known_telescopes and new to instantiate new objects and the get_enu_antpos method to get antenna positions in East, North, Up coordinates.
• Support for writing "MODEL_DATA" and "CORRECTED_DATA" columns has been added to the UVData.write_ms method.
• Support for "flexible-Jones" UVCal objects -- where different spectral windows can contain different Jones vectors/polarization information -- has been added, along with methods for converting UVCal objects to and from flex-Jones format (remove_flex_jones, _make_flex_jones, and convert_to_flex_jones). Support for flex-Jones has been added to MSCal and CalH5 subclasses.
• A new class called MSCal has been added as a subclass of UVCal, which adds support for reading and writing of CASA Measurement Set gains, bandpass, and delays tables. To support this, several new optional parameters have been added to the UVCal class, including phase_center_catalog, phase_center_id_array, antenna_diameters, scan_id_array, and ref_antenna_array (which affords the ability to record a different reference antenna per time-axis entry).
• A new HDF5 file format for calibration solutions called calh5, which supports writing out all types of UVCal objects and supports partial reads (select on read).
• A UVCal.get_lst_array method similar to the get_time_array method that either returns the LST of the mean of the start and stop time for each time range or the lst_array (if there's a lst_array and no lst_range).
• A UVCal.get_time_array method that either returns the mean of the start and stop time for each time range or the time_array (if there's a time_array and no time_range).
• Added new keyword handling for v.6 of the MIR data format within MirParser.

Changed

• Updated minimum dependency versions: scipy>=1.8, setuptools_scm>=8.1
• Updated minimum optional dependency versions: lunarsky>=0.2.4
• Restructured utils.py into a new submodule utils with functions split among several submodules. Utility functions used widely are still available from pyuvdata.utils, although this access pattern is deprecated for some of them.
• Modified UVBeam.interp to speed up processing when check_azza_domain=True.
• Updated minimum dependencies: setuptools>=64, setuptools_scm>=8.0
• Restructured to a src layout. This should not affect most users, but the check_warnings function has moved from pyuvdata.tests to pyuvdata.testing.
• Most packaging information has now moved to the pyproject.toml.
• Future array shapes are now the only supported standard for UVData, UVCal, UVFlag, UVBeam classes.
• UVCal objects where the cal type is delay must now have wide_band=True.
• The flex_spw_id_array is now required for UVCal objects were wide_band=False.
• UVCal objects with wide_band=True may only have the freq_range parameter set and the freq_arrayand channel_width parameters. If wide_band=False, then the freq_arrayand channel_width parameters must be set, while the freq_range parameter must be left unset.
• For UVCal objects, only one of the time-based parameters (time_array and time_range) may be set on a given object.
• Telescope-related metadata (including antenna metadata) on UVData, UVCal and UVFlag have been refactored into a Telescope object (attached to these objects as the telescope attribute) and most of the code related to these attributes from the three objects has been consolidated on the Telescope object. These attributes are still accessible via their old names on the objects, although accessing them that way is now deprecated. Note that the telescope locations are now stored under the hood as astropy EarthLocation objects (e.g. UVData.telescope.location) (or as MoonLocation objects for simulated arrays on the moon if lunarsky is installed).
• The UVData.new and UVCal.new methods now accept a telescope object for setting the telescope-related metadata (the older parameters are still accepted but deprecated.)
• When FHD calibration solutions are read in, the time_range is now set to be one quarter of an integration time before and after the earliest and latest times respectively. This is a change from extending it by half an integration time to prevent apparent overlaps in neighboring calibration solutions due to jd precision loss.
• Improved performance for antpair2ind and _key2inds by using the blts_are_rectangular parameter, and also by caching the results. To improve performance of the cache, the resulting indices are returned as slices whenever possible.
• Changed the way files are passed for reading FHD files. Rather than one list including all the types of files, each file type (e.g. params, obs, layout) must be passed to their own parameter. This makes the API for reading FHD data files more similar to the API for reading FHD cal files. Also removed the use_model parameter because it is no longer needed (only data or model files should be passed as visibility files).
• Require keyword arguments rather than allowing for passing arguments by position for functions and methods with many parameters.
• Only one of time_array and time_range (and similarly lst_array and lst_range) can be set on a UVCal object.
• If time_range is set it must be 2D with a shape of (Ntimes, 2) where the first axis gives the number of different time solutions and the second axis gives the start/stop times for those solutions.

Deprecated

• The future_array_shapes attribute on UVBase objects has been deprecated, as pyuvdata now exclusively uses future array shapes.
• The use_future_array_shapes keyword in several different class methods, as well as the use_future_array_shapes method on UVBase objects.
• Accessing the telescope-related metadata through their old attribute names on UVData, UVCal and UVFlag rather than via their attributes on the attached Telescope object (e.g. UVData.telescope_name -> UVData.telescope.name and UVData.antenna_positions -> UVData.telescope.antenna_positions).
• Passing telescope-related metadata as separate parameters to UVData.new and UVCal.new rather than Telescope objects.
• The UVData.get_ENU_antpos method in favor of UVData.telescope.get_enu_antpos.
• The Telescope.telescope_location and Telescope.telescope_name attributes in favor of Telescope.location and Telescope.name.
• The get_telescope function in favor of the known_telescope_location function and the Telescope.from_known_telescopes classmethod.
• The KNOWN_TELESCOPE dict in favor of the known_telescope_location function and the Telescope.from_known_telescopes classmethod.

Fixed

• Fixed a minor bug in utils._check_freq_spacing that raised issues which raised an error when evaluating a "flex-spw" dataset where Nspws was 1.
• Fixed a bug in UVBase where allowed_failures was being ignored if a parameter had required=True set.
• Fixed a bug where selection and addition/concat methods did not operate correctly on flex-spw UVCal objects where Nspws>1.

Removed

• Support for current array shapes has been removed on UVData, UVCal, UVFlag, and UVBeam objects, as well as the use_current_array_shapes method for these classes.
• The flex_spw attribute has been removed on UVData and UVCal objects.
• Support for using the old phasing attributes (phase_center_ra, phase_center_dec, phase_center_frame, phase_center_epoch, phase_type, and object_name) in UVData.
• Support for handling of the input_flag_array parameter for UVCal objects.
• Support for providing capitalized variants of UVBeam.feed_array.
• Support for 'unknown' cal type in UVCal objects.

[2.4.5] - 2024-6-28

Changed

• numpy c-api for 2.0 compatibility
• numpy.string_ calls to numpy.bytes_, np.in1d to np.isin and a few other changes for numpy 2.0 compatibility.

Fixed

• Fixed #1445 in which in some corner cases the antpairs array was not correctly interpreted as int.

[2.4.4] - 2024-6-7

Changed

• updated minimum cython dependency to 3.0.
• Updated minimum optional dependency versions: astropy-healpix>=1.0.2

Fixed

• Fixed a bug where UVFITS header parameters RDATE and DATE-OBS were being improperly set.
• Fixed a bug with calculating Miriad antenna and baseline numbers, which properly accounts for MIRIAD antennas being 1-indexed not 0-indexed.
• Fixed a bug writing UVData objects to UVFITS formats with extra phase center catalog entries resulted in an error on read.
• Fixed a bug where calling UVData._set_app_coords_helper with extra phase center catalog entries resulted in an error.
• Bug in which correct_cable_len defaulted to None instead of True for read_mwa_corr_fits.

[2.4.3] - 2024-3-25

Added

• Support for new lunar ellipsoids in lunarsky version 0.2.2.
• Added new keyword handling for v.6 of the MIR data format within MirParser.

Changed

• Updated minimum dependency versions: astropy>=6.0, h5py>=3.4, numpy>=1.23, pyerfa>=2.0.1.1, scipy>=1.7.3, python>=3.10
• Updated minimum optional dependency versions: hdf5plugin>=3.2.0, pytest>=6.2.5, python-casacore>=3.5.2, pyyaml>=5.4.1, lunarsky>=0.2.2
• Speed up for reading MWA correlator FITS files into UVData.
• Now compatible with pytest>=8.0 but require pytest-cases>=3.8.3.

Fixed

• Fixed a bug where SMA-based coordinates were recorded as FK5 for sidereal sources (should be ICRS).
• Bug in which passing 'ee' or 'nn' pols to UVData.new() would error, even if x_orientation was passed.

[2.4.2] - 2024-2-22

Added

• Added a new redundancy finding algorithm based on the HERA gridding algorithm. This new algorithm is used by default but the older clustering algorithm is still available.
• Added support for initializing MirParser and MirMetaData objects from Path objects.
• Added a brief tutorial on how to convert SMA MIR data into MS format (with some notes on SMA specific keywords than can be used).
• Added the Mir.generate_sma_antpos_dict method for reading in SMA-formatted antenna position files into a dict (which can be passed to UVData.update_antenna_positions).
• Added handling for older formatted (so called "ASIC-era") MIR files from SMA, as well as more recent file formats that preceded pyuvdata support (circa 2020, v1/v2 of the MIR file format).
• Added the ability to save/load selection masks in MirParser objects.
• Fixed a bug when trying to write a MS with a legacy array shape (but note legacy shape will be deprecated in upcoming releases).
• Improved support for MIRIAD UV files, and added use_miriad_convention flag to the UVFITS writer code, so files with the MIRIAD BASELINE convention can be created.
• A new freq_interp_kind parameter to UVBeam.interp, UVBeam._interp_az_za_rect_spline and UVBeam._interp_healpix_bilinear to allow the frequency interpolation specification to be passed into the methods. Note this defaults to "cubic" rather than "linear" (the old default for the attribute of the same name on UVBeam objects) because several groups have found that a linear interpolation leads to nasty artifacts in visibility simulations for EoR applications.
• A new UVBeam.new() method (based on new function new_uvbeam) that creates a new, self-consistent UVBeam object from scratch from a set of flexible input parameters.
• Added a the UVData.update_antenna_positions method to enable making antenna position updates with corresponding updates the uvw-coordinates and visibility phases.
• Added a switch to UVData.write_ms called flip_conj, which allows a user to write out data with the baseline conjugation scheme flipped from the standard UVData convention.
• Added the utils.determine_pol_order method for determining polarization order based on a specified scheme ("AIPS" or "CASA").
• Added a check_surface_based_positions positions method for verifying antenna positions are near surface of whatever celestial body their positions are referenced to (either the Earth or Moon, currently).

Changed

• Made the determination of whether or not to create a flex-pol dataset when reading in a MIR more robust (particularly with pre-V3 data formats).
• Reading in of MIR data sets into UVData objects will now use pyuvdata-calculated values for lst_array via (UVData.set_lsts_from_time_array) instead of those read in from the file due to known precision issues in the later (~25 ms), so long as the two agree within this known precision limit.
• UVFlag.to_baseline and UVFlag.to_antenna are now more robust to differences in antenna metadata sorting.
• Made MirParser more robust against metadata indexing errors.
• Made MirParser handling of autocorrelation data more robust.
• Improved hooks for handling and loading of COMPASS solutions into MirParser objects.
• Fixed handling of weights to be consistent with tsys scaling method in MirParser.
• Changed MWACorrFits.corrcorrect_simps method to use the scipy.integrate.simpson method rather than the scipy.integrate.simps method to fix deprecation warnings.
• added support for python 3.12, dropped support for python 3.8.
• Updated minimum dependency versions: pyyaml>=5.3
• Changed UVData.write_ms to sort polarizations based on CASA-preferred ordering.
• Added some functionality to the utils._convert_to_slices method to enable quick assessment of whether an indexing array can be replaced by a single slice.
• Increased the tolerance to 75 mas (equivalent to 5 ms time error) for a warning about values in lst_array not conforming to expectations for UVData, UVCal, and UVFlag (was 1 mas) inside of check. Additionally, added a keyword to check enable the tolerance value to be user-specified.
• Changed the behavior of checking of telescope location to look at the combination of antenna_positions and telescope_location together for UVData, UVCal, and UVFlag. Additionally, failing this check results in a warning (was an error).

Deprecated

• The freq_interp_kind attribute on UVBeams.
• The spw_array and Nspws attributes on UVBeam objects. Also the unset_spw_params and set_spw_params parameters to the use_future_array_shapes and use_current_array_shapes methods on UVBeam objects.
• Upper case feed names (e.g. "N" or "E") in UVBeam.feed_array. This was never fully tested and didn't work properly.
• Having freq_range defined on non-wide-band gain style UVCal objects.
• Having freq_array and channel_width defined on wide-band UVCal objects.

Fixed

• A bug where time_array was not being correctly calculated for older (pre-V3) MIR data formats.
• A small bug in UVFlag that could occur when reading in an older UVFlag HDF5 file with missing antenna metadata.
• A small bug (mostly affecting continuous integration) that threw an error when the IERS service was down and when tests were using test.check_warnings to look for no warnings thrown (i.e., where match=None).
• A couple of small bugs related to handling of the freq_range parameter in the reorder_freqs and __add__ methods on UVCal.

[2.4.1] - 2023-10-13

Added

• Added a uvw_track_generator method within utils for calculating the expected uvws (and a few other values) without needing to instantiate a whole UVData object.
• Added a convenience function called compare_value in UVParameter that enables one to do value checking with tolerances accounted for.
• New mwa_metafits_file and telescope_name optional parameters to UVFlag.read and UVFlag.__init__ to help with setting telescope metadata for old UVFlag files that are missing it.
• MWA antenna metadata to our known telescopes to allow them to be filled in for old UVFlag files. This is a stopgap solution, a better approach is to pass an MWA metafits file to the new mwa_metafits_file parameter.
• Support for recarrays in UVParameter objects and in UVBase, needed for pyradiosky.
• Support for setting the astrometry library for various object methods including set_lsts_from_time_array, file read methods and others.
• Properly round-trip the telescope frame through UVH5, UVFITS and MS files.

Fixed

• A bug in apparent coordinate calculation that resulted in small errors/loss of precision due to the way times were passed when using erfa astrometry library.
• A small correction due to polar drift for LST calculation when using the erfa astrometry library.
• Fixed a bug in utils.calc_app_coords that occurred when supplying an astropy Time object for the time_array argument.
• Fixed a bug in UVData.write_ms that caused the writer to crash if prior measurement set history was not formatted in the currently expected fashion.

[2.4] - 2023-07-12

Added

• Support for multiple spectral windows in UVData.frequency_average, including a new parameter respect_spws for controlling whether averaging crosses spectral window boundaries.
• Better handling in UVData.frequency_average when averaging by a number of channels that does not divide evenly into the number of channels in each spectral window.
• Compatibility with Python 3.11

Changed

• The following UVFlag parameters are now required: Nspws, channel_width, spw_array, telescope_name, telescope_location, antenna_names, antenna_numbers, and antenna_positions.
• The quality_array on UVCal objects is no longer required.

Deprecated

• The sky_field attribute on UVCal.

Fixed

• A bug in LST calculation that led to small discontinuities in LSTs calculated using the erfa or novas astrometry libraries.
• Error when setting UVBeam.freq_interp_kind to an integer.
• Error when reading mwa_corr_fits files from the new MWAX correlator

Removed

• The phase_uvw and unphase_uvw utility methods associated with old style phasing.
• The with_conjugates option to the get_baseline_redundancies utility method in favor of the include_conjugates option.
• Support for the interpolation_function attribute on UVBeams.
• Support for the "unphased" catalog type in UVData.phase_center_catalog in favor of the "unprojected" catalog type.
• The UVData.unphase_to_drift method in favor of UVData.unproject_phase method.
• Support for using old style phasing on UVData objects (the UVData.fix_phase method to fix datasets that were phased with the old style of phasing remains as well as the fix_old_proj option on read for uvfits, miriad and uvh5 file types).
• Phasing related keywords in the following UVData methods: __add__, __iadd__, fast_concat, read and from_file. Multiple phase centers are now fully supported so datasets can always be combined without phasing. If desired, the full object can be rephased to a single phase center afterwards.
• The use_cotter_flags and flag_small_sig_ants options to the UVData.read and UVData.from_file methods for MWA correlator fits files in favor of the use_aoflagger_flags and flag_small_auto_ants options respectively.
• The spoof_nonessential option to UVData.write_uvfits method as the previously spoofed parameters are now properly calculated.

[2.3.3] - 2023-05-25

Added

• New dependency docstring-parser to enable dynamic docstring generation for methods that mostly wrap other methods.
• A new UVCal.new() method (based on new function new_uvcal) that creates a new, self-consistent UVCal object from scratch from a set of flexible input parameters.
• A new UVData.new() method (based on new function new_uvdata) that creates a new, self-consistent UVData object from scratch from a set of flexible input parameters.
• A new fast_concat method on UVCal.
• A new generic read method on UVCal that, like the read methods on our other objects, supports all file types and a new from_file class method to allow one-line reading of UVCal files.

Deprecated

• The input_flag_array attribute on UVCal.
• Support for the 'unknown' cal_type in UVCal.
• Reading in multiple files to UVCal using file-type specific read methods (e.g. read_calfits) in favor of the generic read method.

Fixed

• Removed error when time_axis_faster_than_bls=True and Ntimes=1. In the case of Ntimes=1, it is inconsequential whether time-axis moves first or not, so it should not be an error.

[2.3.2] - 2023-04-10

Added

• The catalog_name keyword has been added to the UVData.read and UVData.select methods to allow users to select on source name.

Changed

• The keywords for UVData.read have been changed for MIR-specific values to more generally match those founds with other data types.
• The UVData.read_mir method has been overhauled to mak reading in of MIR data more efficiency in memory/processor usage.

Fixed

• Frequency frame information for MS datasets is now correctly recorded as "TOPO".

[2.3.1] - 2023-04-03

Added

• A new FastUVH5Meta object that enables quick partial reading of uvh5 file metadata. This is used by default in the UVData.read_uvh5 method to initialize a UVData object, without any apparent change for the user. To get the benefits of the new class, use it directly to interface with the metadata portion of a .uvh5 file.

Changed

• Updated numpy requirements to >=1.20.
• Updated scipy requirements to >=1.5.

Fixed

• Handling of antenna_names and antenna_numbers in read_fhd and read_fhd_cal.

[2.3.0] - 2023-03-13

Added

• A new interpolation_function parameter to UVBeam.interp and UVBeam.to_healpix to allow the function name to be passed into the methods, with sensible defaulting.
• Support for selecting on phase center IDs, including on read.
• Several new attributes to UVFlag: telescope_name, telescope_location, antenna_names, antenna_numbers, antenna_positions, channel_width, spw_array, flex_spw_id_array, enabling support for flexible spectral windows. All of these except flex_spw_id_array will eventually be required for all UVFlag object types, as will Nspws (which used to only be required for baseline and antenna types). These parameters all already exist on UVData and UVCal objects and UVFlag objects initialized from them will inherit them. UVFlag objects will also inherit these parameters when they are converted between types using UVData and UVCalobjects.
• The UVFlag.set_telescope_params method, similar to the ones on UVData and UVCal, to set several of these new parameters.

Changed

• Increases the h5py minimum version to 3.1.
• Increase the minimum compatible version for lunarsky to 0.2.1 to fix astropy deprecation warnings.

Fixed

• Fixed some bugs related to handling of the UVCal.time_range parameter in UVCal.__add__ and other methods. Ensured that it is a list when UVCal.future_array_shapes is False.
• Fixed a bug in UVCal.__add__ when data are sorted differently along any axis or interleaved along an axis.
• Fixed a bug in reading MS files with non-UTC time scales.
• Fixed some bugs in UVData, UVFlag and UVCal __add__ and select methods for objects with only one spectral window and flex_spw_id_array defined. Also fixed some handling in those methods on UVFlag for objects with multiple spectral windows.
• Fix a bug when reading FHD files into UVData objects when the layout file was not passed but the antenna_positions are in the known telescopes.
• Fixed a bug where the beamfits partial read parameters were not available in the UVBeam.from_file class method and were not passed properly when reading multiple files.
• Fixed a bug where objects created from scratch with the old phase attributes weren't properly getting converted to the new phase_center_catalog representation. That conversion now happens in the check so will happen before any write. There could still be errors if some methods are called before a check is done (or if the check is turned off).
• Fix a bug in how frame_pa was calculated in phase and _set_app_coords_helper for multi_phase_center objects (it was using the old phase_center_frame attribute).
• Fix a bug where trying to select lsts or lst_ranges on read didn't work for some file types.
• Severe performance hit when calling polnum2str and its variants for many baselines.

Deprecated

• Reading files into objects without setting use_future_array_shapes now results in deprecation warnings.
• The utility functions phase_uvw and unphase_uvw associated with the deprecated old phasing method.
• The flex_spw_id_array will be required on all UVData and UVFlag and all non-wide-band UVCal objects in version 3.0.
• Deprecated the interpolation_function attribute on UVBeams.
• Deprecated the older phase attributes (phase_type, phase_center_ra, phase_center_dec, phase_center_frame, phase_center_epoch, object_name) in favor of the phase_center_catalog. The older phase attributes will be removed in version 3.0.
• The lst_from_uv function in the uvflag module.

Removed

• Removed deprecated handling for UVCal objects without telescope_location, antenna_positions and lst_array parameters defined.

[2.2.12] - 2022-12-07

Changed

• Updated how wheels for PyPI are built.

[2.2.11] - 2022-11-30

Added

• A frame attribute to the telescope_location parameters on UVData, UVCal and UVFlag objects to support observatories on the moon (or anywhere not on earth).

Fixed

• A bug in UVData.read_uvh5 where multi_phase_center was being used to imply the existence of the phase_center_catalog header item, rather than checking for the presence of that item. This conflicted with the uvh5 memo.

[2.2.10] - 2022-10-20

Added

• A new subclass of UVParameter for SkyCoord objects, needed in pyradiosky.
• Added UVData.convert_to_flex_pol method to enable writing uvh5 files with the polarization axis changing slowest as desired by HERA. Also updated UVData.remove_flex_pol to properly undo the UVData.convert_to_flex_pol operation.
• Added an option to UVData.read and UVData.from_file methods when reading uvh5 type files to call remove_flex_pol as part of the read. This is defaulted to True so that when HERA data is written with flex_pol the change will not disrupt users, but other users of uvh5 may want to set it to False.
• Added support to make bitshuffle compression easier when writing UVData objects to uvh5 files
• Support for partial reads on beamfits files. This can be done on frequency, azimuth or zenith angle (if beam is in az/za coordinates).
• Logging statements (INFO level) in UVData.check.

Changed

• Significantly increased uvh5 reading and writing speed.
• Added use_future_array_shapes method to UVBeam to allow users to convert to using the future array shapes now, with support throughout UVBeam methods and related utility functions. Also added use_current_array_shapes to revert to the standard shapes.
• Major performance improvement in the UVBeam.to_healpix method.
• Performance improvement when doing a UVData.select using the bls parameter (~70% improvement in the _select_preprocess function)

Fixed

• A bug in UVData.check when check_autos is True and the object is a flex pol object.

[2.2.9] - 2022-8-23

Added

• Added use_future_array_shapes method to UVFlag to allow users to convert to using the future array shapes now, with support throughout UVFlag methods and related utility functions. Also added a use_future_array_shapes parameter to UVFlag's __init__, read, from_uvdata and from_uvcal methods to allow the conversion to be done at the time the object is made. Added use_current_array_shapes to revert to the standard shapes.
• Baseline number calculations for antenna numbers > 2047.
• New uvh5 version 1.1 definition in memo and code to use the future phasing info (i.e. the phase_center_catalog) rather than the older parameters.
• Added the normalize_by_autos method to UVData, which allows one to normalize cross-correlations (i.e., covert values from arbitrary scale to correlation coefficients) if auto-correlations are present in the data.
• Added the write method to MirParser, which allows for MirParser to write out Mir-formatted data to disk.
• Added the select method to MirParser, which provides a much simpler interface for selecting subsets of data to load.
• Added the rechunk method to MirParser, which allows data to be spectrally averaged (either after already loading or to be averaged "on-the-fly" when data are read from disk).
• Added the redoppler_data method to MirParser, which enables frequency shifting of the data.
• Added new __add__ and __iadd__ methods to MirParser for combining data sets.
• Added new functionality to UVBeam.check to verify that power beams for the auto polarizations (and pstokes) are real-only, along with an option to force them to be real-only if non-zero imaginary components are detected.
• Coarse band correction for mwax to mwa_corr_fits
• Reordering methods for UVCal: reorder_antennas, reorder_freqs, reorder_times and reorder_jones.

Changed

• Always write out uvh5 version 1.0 or greater files (which use the future array shapes) with UVData.write_uvh5.
• Use "unprojected" rather than "unphased" for the cat_type in the phase_center_catalog to describe zenith driftscan data that have no w-projections applied.
• The MirParser class has been significantly overhauled, which significantly reduces memory usage and improves processing speed.
• Updated minimum dependency versions: numpy>=1.19, scipy>=1.3, optional dependencies: python-casacore>=3.3, pyyaml>=5.1, astropy-healpix>=0.6
• UVBase object now require that individual attribute names match that given in UVParameter._name.
• UVData.fix_phase now raises a warning when called.
• Changed UVData.write_uvfits to allow for one to write out datasets in UVFITS format without "spoofing" (via setting spoof_nonessential=True) UVFITS-specific values.
• Methods that ensure that attributes are set up properly on UVBeam are now called in the UVBeam.check method, making it easier to fill in UVBeam objects from scratch.
• Changed uvfits reading and writing to no longer subtract/add 1 to the antenna numbers. The subtraction/addition of 1 was initially done because FITS uses one-based indexing but antenna numbers are physical numbers not indices, so the numbers should not be adjusted.
• Changed the way baseline numbers are calculated from antenna numbers to conform to the standard in uvfits and miriad. The inconsistency with those files was noticed when we corrected the handling of antenna numbers in uvfits.
• The spw_order parameter for the UVData.reorder_freqs method now accepts an index array rather than an array of spw numbers, making it match the other reorder methods.
• Updated the astropy requirement to >= 5.0.4
• Dropped support for python 3.7

Fixed

• Store the phase_center_catalog as a set of nested datasets in uvh5 files rather than as a json blob.
• A bug in UVData.__add__ where flexible spectral window datasets were not combined correctly if they contained overlapping frequencies in different spectral windows.
• A bug in UVData.print_phase_center_info that occasionally resulted in incorrect values being reported for RA/Az/Longitudinal coordinates.
• A bug in UVData.select that could cause UVData.check to fail if UVData._scan_number_array was set.
• A bug in UVBeam.select where after selecting down to only auto polarization power beams the UVBeam.data_array remained complex instead of real.
• A bug in UVBeam.__add__ where adding an object with cross pol power beams to an object with only auto pol power beams could result in loss of the imaginary part of the cross pol power beams.
• Testing of piping keywords through read by test_mwa_corr_fits.
• Incorrect piping of flag_dc_offset keyword.
• mwa_corr_fits handing of the BSCALE keyword in gpubox files.

Deprecated

• The "unphased" cat_type in phase_center_catalog.

[2.2.8] - 2022-2-15

Added

• Parameter check_azza_domain in UVBeam.interp(), which can turn off the (relatively expensive) check on input az/za values.

[2.2.7] - 2022-02-09

Added

• The UVCal.initialize_from_uvdata method to initialize a UVCal object using metadata from a UVData object.
• An option to UVData.reorder_blts to sort the autos before the crosses.
• Added new functionality to UVData.check to verify that auto-correlations are real-only, along with an option to force them to be real-only if non-zero imaginary components are detected.

Changed

• UVFlag.to_baseline() uses internal time tolerances (both rtol and atol) stored in the UVParameter _time_array.tols to check whether times in the UVFlag object and the input UVFlag/UVData object match.

Deprecated

• The with_conjugates keyword in favor of the include_conjugates keyword in the utils.get_baseline_redundancies function.

[2.2.6] - 2022-01-12

Added

• A new attribute to UVData called flex_spw_polarization_array, of type=int and shape=(Nspws,), which allows for individual spectral windows to carry different polarization data.
• Added the _make_flex_pol and remove_flex_pol methods to UVData, which allows for one to convert a standard UVData object to one with "flexible-polarization".
• Added a new method to MirParser called _apply_tsys, which will convert MIR visibility data from correlation coefficients to pseudo-Jy.
• Added a method to Mir called _init_from_mir_parser, which allows for one to pass a MirParser object to be converted into a UVData object (rather than reading from a file on disk).
• Added the flex_spw attribute to the UVCal class, which can be set to True by using the new _set_flex_spw method.
• Added the optional flex_spw_id_array attribute to UVCal class, of type=int and shape=(Nfreqs,), which indexes individual channels along the frequency axis to spw_array.
• Added use_future_array_shapes method to UVCal to allow users to convert to using the future array shapes now, with support throughout UVCal methods and related utility functions. Also added use_current_array_shapes to revert to the standard shapes.
• Added support for wide-band gain calibrations via the wide_band attribute on the UVCal class, which can be set using the new _set_wide_band method.
• Added time_range, lsts, and lst_range kwargs from UVH5.write_uvh5_part() to UVData.write_uvh5_part().
• Added time_range, lsts, and lst_range kwargs from UVH5.write_uvh5_part() to UVData.write_uvh5_part().

Changed

• General performance improvements in the read_mir method.
• Enabled read_mir to read in dual- and full-polarization data.

Fixed

• Fixed a bug where UVData.compress_by_redundancy sometimes produced incorrectly conjugated visibilities.
• Fixed a bug where lsts and lst_range got ignored when doing partial i/o with multiple files.

[2.2.5] - 2021-12-21

Added

• Support for reading MWAX correlator fits files.
• Added a warning when using UVData.write_uvfits when the vis_units attribute is anything other than Jy.
• Added a warning when using UVData.write_uvfits if a UVData object has > 256 antennas, recommending use of UVData.write_ms if intending to import the data into CASA.
• Reading writing of scan numbers for MS files as UVData.scan_number_array.
• Grouping of contiguous integrations for a phase center into "scan numbers" in UVData._set_scan_numbers. This grouping defines UVData.scan_number_array when not originally present in the data (e.g. reading in a non-MS file) and is used when writing to an MS file.
• Added a filename attribute to UVCal, UVBeam and UVFlag objects.
• Support for reading MWAX/birli uvfits files.
• Flexible spectral windows to read_mwa_corr_fits.

Changed

• Changed the UVData.write_ms to reduce processing time and memory footprint.
• Changed the order in which data are written in Measurement Set format via the method UVData.write_ms, where data are now first grouped together by scan_number_array.
• Changed the defaults by which the UVData.antenna_names attribute is set when reading measurement sets (used to default to station names, now uses antenna names if available and the MS file was not written using the CASA importuvfits routine).
• Fixed a bug where UVData.x_orientation and UVData.vis_units were not being written to / read from measurement sets.
• Updated the astroquery requirement to >= 0.4.4, due to changes in the API handling for calls to JPL Horizons.
• Assumes uvfits files are in ITRF frame unless explicitly stated otherwise. Consistent with AIPS 117.
• Improved readability, functionality, and memory usage in read_mwa_corr_fits.

Fixed

• A bug in writing calfits files when the optional time_range parameter is not set.
• A bug where the TIME_CENTROID field was not being filled in data sets written by UVData.write_ms, which caused odd behavior in some CASA routines (e.g., gaincal).
• A bug in reading in uvfits files with baseline coordinates that have suffixes of '---SIN' or '---NCP' which are allowed in uvfits files.
• A bug that could cause some routines in CASA to fail when using data sets written by UVData.write_ms.
• A bug that could have resulted in UVData.__add__ combining objects together incorrectly when containing overlapping time-baselines/polarization/frequency channels together that were ordered differently for the two UVData objects.
• A bug that prevented extra_keywords keys with a value of None from being saved to UVH5 files.
• A bug that resulted in the wrong expected shapes for data-like arrays when metadata only UVData objects were set to use future array shapes.
• A bug that caused an error when writing non-double antenna diameters to measurement set files
• Added a warning in utils.uvcalibrate when uvdata x_orientation is not set.
• Fixed a bug in UVBeam.efield_to_power when there is only one feed.

[2.2.4] - 2021-10-14

Fixed

• Fixed a bug in converting non-crosspol power beams to real in UVBeam.efield_to_power.

[2.2.3] - 2021-10-13

Fixed

• A bug that resulted in coordinate queries via for solar-system objects utils.lookup_jplhorizons to throw an error. The workaround temporarily requires the precision for ephemerides to be limited to 0.05 arcseconds.
• A bug that resulted in a potential error when attempting to write out multi-phase-center data sets into the UVH5 file format.

[2.2.2] - 2021-9-30

Added

• Added the UVData.write_ms method, a UVData measurement set writer.
• Added an option to the UVData.check method to flip the uvws and conjugate the data_array to align with the UVData convention on baseline orientation.
• Added the flip_gain_conj option to utils.uvcalibrate to use the opposite gain conjugation convention in calibration.
• Support for selecting on polarization strings on UVData, UVCal, UVBeam and UVFlag.
• from_file class function on UVData and UVBeam. Allows users to instantiate an object from a file directly from each Class.
• Generic 'read' function for UVBeam objects.
• UVData methods set_data, set_flags, and set_nsamples which allow the user to update values in the corresponding arrays.
• pyERFA was added as an explicit dependency (previously it was implicit because it is an astropy dependency).

Fixed

• A bug in the way times were written to uvfits files that could cause a loss of precision.
• A bug that allowed the check to pass on UVData, UVCal and UVFlag objects if the flag_array contained integers instead of booleans.
• A bug in equality testing for UVParameter objects with strict types when the parameters contain arrays.
• Provide a more useful error message if UVCal.read_fhd_cal is called with read_data=False and a settings file is not provided.
• Fixed a bug in UVCal.read_fhd_cal where the reader crashed on a metadata only read if the settings file had an empty field for the diffuse model.
• Fixed a bug in UVBeam.efield_to_power where a the data_array remained complex rather than real because the tolerance was too low in the numpy real_if_close call.

[2.2.1] - 2021-7-21

Changed

• The __eq__ method on UVBase objects (and subclasses) now supports an allowed_failures keyword for parameters which are allowed to be unequal without failing the check. This includes the filename parameter of UVData objects by default.

[2.2.0] - 2021-6-26

Added

• Added filename attribute for UVData objects.
• Added support for multiple sources/phase centers in a single UVData object, which can be enabled using the _set_multi_phase_center method. Using this method will set the new attribute multi_phase_center to True (otherwise set to False.).
• Added the optional attribute Nphase, of type int and required if multi_phase_center=True, which records the number of different phase centers recorded in the UVData object.
• Added the optional attribute phase_center_catalog, a dictionary of dictionaries that is required if multi_phase_center=True, which records various meta-information about the different phase centers used within the UVData object. The keys of individual entries of phase_center_catalog are strings representing the names of the individual phase centers. These keys are matched to individual dictionaries which store various information about the phase centers, including coordinate information (e.g., cat_lat, cat_lon, cat_frame, cat_epoch) and a unique identification number (cat_id, type int). Catalog information can be printed to the terminal using the method print_phase_center_info.
• Added the optional attribute phase_center_id_array, of type int and shape (Nblts,) required if multi_phase_center=True, which records which phase center the individual baseline-time record is phased to. The individual values of are matched to cat_id from the individual dictionary entries of phase_center_catalog.
• Added the attributes phase_center_app_ra and phase_center_app_dec, which records he topocentric apparent positions of the phase center as seen from the position telescope_location. Both are of type float, shape (Nblts,).
• Added the attribute phase_center_frame_pa, of type float, shape (Nblts,), which encodes the position angle between the topocentric apparent frame and the celestial frame of phase center coordinates, as recorded in phase_center_frame (e.g., FK5, ICRS). UV-coordinates are rotated by phase_center_frame_pa, such that
• Added a switch called ignore_name to __add__ which allows one to ignore whether the object_name attribute matches when attempting to combine objects (default is ignore_name=False, which will cause an error to be thrown if object_name does not match). This parameter is also available with the read method, when reading in multiple files.
• Added a switch called make_multi_phase to the __add__ method, which will convert the data to a multi-phase-center-enabled dataset, allowing for UVData objects with different phase centers to be combined. This parameter is also available with the read method, when reading in multiple files.
• Added the fix_phase method, which converts UVData objects from the "old" phasing framework to the "new' phasing framework.
• Added support for looking up ephemeris information of solar system objects from JPL-Horizons via the optionally required astroquery packaged.
• Added option to select based on LST or an LST range in UVData objects.
• Added get_lsts method on UVData objects for retrieving LST corresponding to data.

Changed

• utils.uvcalibrate will error rather than warn if some of the newly added checks do not pass, including if antenna names do not match between the objects.
• Phasing methods (e.g., UVData.phase, UVData.unphase_to_drift, UVData.set_uvws_from_antenna_positions) have undergone a significant revision, which change the way in UVW coordinates are calculated. Specifically, these methods will now use the topocentric apparent positions (stored in the attributes phase_center_app_ra, phase_center_app_dec). As a result, phasing of data and calculating of uvw-coordinates are significantly faster.
• phase method now supports phase centers of different types, specified by the cat_type parameter. Supported types include "sidereal" (default; fixed position in RA/Dec), "ephem" (position in RA/Dec which moves with time), and "driftscan" (fixed position in Az/El, NOT the same as phase_type=“drift”). The "ephem" and "driftscan" types can only be used when multi_phase_center=True.
• phase now uses antenna positions for deriving uvw-coordinates by default.
• Decreased the standard tolerances for angle-based parameters to 1 mas (was 10 mas).
• Updated the astropy requirement to >= 4.2.1
• Unknown phasing types (i.e., phase_type="unknown") are no longer supported, read (and the associated file-reading methods) will default phase_type to "drift" when unable to definitively ascertain the phasing type.

Fixed

• A bug in aipy_extracts.pipe that caused an error when using raw=True.
• A bug in aipy_extracts.write which caused an error when using certain masked arrays.
• Phasing accuracy/UVW coordinate calculation no longer limited to 2 cm on a 3 km baseline (i.e.,~1 part in 1e5; new accuracy is better than 1 part in 1e8).
• A bug in reading DSB data from Mir filetypes, that resulted in visibilities being matched to the wrong baselines.
• A bug in UVData.phase_to_time which prevented users from rephasing phased objects.
• A bug in UVBeam.read_cst_beam when specifying beams with a single file using a yaml.

Removed

• The UVBeam methods set_cs_params, set_efield, set_power, set_simple, and set_phased_array have been removed.
• The UVCal methods set_gain, set_delay, set_unknown_cal_type, set_sky, and set_redundant have been removed.
• The UVData methods set_phased and set_drift have been removed.
• The functions utils._str_to_bytes and utils._bytes_to_str have been removed.
• The flag_missing keyword of the utils.uvcalibrate function has been removed.

[2.1.5] - 2021-4-02

Added

• Added use_future_array_shapes method to allow users to convert to using the future array shapes now, with support throughout UVData methods and related utility functions. Also added use_current_array_shapes to revert to the standard shapes.
• Added versioning to UVH5 files. Files with future array shapes are version 1.0, files with the current shapes are are version 0.1.
• Added UVData.reorder_freqs method to reorder the data along the frequency axis.
• Better re-initialization of UVParameters on UVBase objects when using pickle. Improves compatibility of UVBase objects with MPI.
• Added option to apply a Van Vleck correction to mwa_corr_fits files.

Fixed

• A bug in mwa_corr_fits that resulted in an error when using memap=true while reading files containing the 'BSCALE' keyword.
• A bug in mwa_corr_fits that didn't properly test against 2015 data, and so didn't catch the error when using memap=true while reading files containing the 'BSCALE' keyword.
• A bug in mwa_corr_fits that didn't round start_flag to the nearest multiple of integration time when using goodtime, resulting in an error when reading data taken at 2 seconds.
• A bug in reading in the MWA beam that caused the beam to be rotated by 90 degrees.

[2.1.4] - 2021-2-04

Added

• Added propagate_coarse_flags option to read_mwa_corr_fits, as well as new flagging defaults.
• Added support for extra_keywords in UVFlag construction from UVData objects (and paths)

Changed

• Improved memory usage in reading MWA correlator fits files.
• Speed improvement in redundant group finder.

Fixed

• Fixed a bug in compress_by_redundancy with method='average' that resulted in more unique times on the compressed object than on the original object.
• Fixed bug causing MemoryError when finding redundant baselines for over 100 antennas.

[2.1.3] - 2020-12-15

Added

• Added support for telescope_location, antenna_positions and lst_array in UVCal objects and file types.
• Added support for a metadata_only mode in UVCal, including options to only read the metadata when reading in calibration files.
• Added a copy method for UVCal objects.
• Added antenna_positions, antenna_names and antenna_numbers as optional metadata to our known telescopes list and added HERA antenna position information.
• Added handling for extra_keywords in UVFlag objects, including read/write to/from files.
• Added handling for object_name and extra_keywords to sum_vis and diff_vis methods and added the override_params option to override other parameters.

Changed

• Changed to use Astropy sites for telescope locations when avaliable. This results in a small change for our known position for the MWA.
• Modified UVData.read to do faster concatenation of files, changed the interface to UVData.fast_concat to allow lists of UVData objects to be passed in.

Fixed

• Fixed a bug where telescope positions from MWA uvfits files created by Cotter were not identified as being in the ITRF frame because of a missing FITS keyword.
• Fixed a bug where antenna_positions from FHD files were interpreted as being in the relative ECEF frame rather than the rotated ECEF frame
• Fixed a bug where the lst_array was not updated in compress_by_redundancy when using method='average'.
• Fixed an undefined parameter bug when interpolating beams that do not cover the sky.
• Fixed an indexing error bug in compress_by_redundancy when using method='average'.

Deprecated

• UVCal objects now require telescope_location, antenna_positions and lst_array parameters. Not setting them will cause an error starting in pyuvdata 2.3.

[2.1.2] - 2020-10-07

Added

• Added support for multiple spectral windows for UVH5, UVFITS, MIR, and MIRIAD files.
• Added the flex_spw attribute to the UVData class, which can be set to True by using the new _set_flex_spw method.
• Added the optional flex_spw_id_array attribute, of type=int and shape=(Nfreqs,), which indexes individual channels along the frequency axis to spw_array.
• Adjustment to digital gain removal from mwa_corr_fits files to account for a division by 64 due to a bit selection shift.
• Options to remove coarse band shape and digital gains from mwa_corr_fits files.
• Support for cotter flags in mwa_corr_fits files.

Changed

• When flex_spw=True, the channel_width attribute of UVData is expected to be an array of type=float and shape=(Nfreqs,). Individual channels are allowed to have different channel widths.
• Changed freq_array to be of shape (1, Nfreqs) (formerley (Nspws, Nfreqs)).
• Changed data_array, flag_array, nsample_array to be of shape (Nblts, 1, Nfreqs, Npols) (formerly (Nblts, Nspws, Nfreqs, Npols)).
• Changed UVH5 metadata byte conversion method from tobytes() to bytes()

[2.1.1] - 2020-8-07

Added

• Added read-only support for MIR files, adding the Mir class to UVData.
• Added the MirParser class, which allows for python access to MIR files.
• A new check_warnings method in our test module that behaves like pytest.warns but adds the ability to check for multiple warnings.
• The 'ant_str' option when making selects on UVFlag objects
• A check that the uvws match the antenna positions, as part of the acceptability checking.

Changed

• Updated the numpy requirement to >= 1.18
• Moved parse_ants to utils.py to allow any UVBased object the potential to use it.

Deprecated

• The checkWarnings function in our test module, use the new check_warnings function instead.

[2.1.0] - 2020-7-08

Added

• UVFlag can now take PosixPath objects as input.
• An option to average rather than select a single baseline in UVData.compress_by_redundancy, controlled by the method keyword.
• nsample_array_dtype keyword for UVData.read, which sets the datatype for the nsample_array. Currently only used for mwa_corr_fits files.
• utils cython module to speed up some common utility functions.
• Added support for installing the package on Windows.
• 'background_lsts' keyword in uvdata.read to calculate lsts in the background while reading. Defaults to True.
• background keyword in uvdata.set_lsts_from_time_array to allow lst calculation in a background thread.
• read_data keyword to read_mwa_corr_fits, allows from metadata only reads of MWA correlator fits files.
• propagate_flags keyword for UVData.frequency_average which flags averaged samples if any contributing samples were flagged

Changed

• Nants data calculation changed to use numpy functions for small speed up.
• Changed input variable to indata in UVFlag to avoid shadowing python builtin.
• select now also accepts a list of baseline indices for the bls parameter.
• data_array_dtype keyword for UVData.read is now also respected by mwa_corr_fits files. Previously it was only used by uvh5 files.
• The time_range parameter on UVCal is no longer required and it is suggested to only set it if the Ntimes axis is length one.
• FHD now supports metadata only reads.
• Updated formatting and added more explicit typing in corr_fits.pyx
• Updated Nants calculations for speed up.
• updated HERA telescope location to match the HERA defined center of array.
• utils.uvcalibrate now incorporates many more consistency checks between the uvcal and uvdata object. The new keywords time_check and ant_check were added to control some of these checks.

Deprecated

• The UVBeam methods set_cs_params, set_efield, set_power, set_simple, and set_phased_array have been made private. The public methods will be removed in version 2.2.
• The UVCal methods set_gain, set_delay, set_unknown_cal_type, set_sky, and set_redundant have been made private. The public methods will be removed in version 2.2.
• utils.uvcalibrate will error rather than warn if some of the newly added checks do not pass, including if antenna names do not match between the objects, starting in version 2.2. In addition, the flag_missing keyword is deprecated and will be removed in version 2.2.

Fixed

• UVFlag.add now properly concatenates all existing data-like parameters of the object, including optional ones.
• A bug in UVData.downsample_in_time where the data were not being properly weighted by the nsample array and the nsample_array was not being properly weighted by the integration times.
• A bug in UVData.downsample_in_time that lead to duplicated data on the final object if a baseline had varying integration times and some integration times were greater than or equal to the requested minimum integration time.

[2.0.2] - 2020-4-29

Added

• New _corr_fits C extension for performing the index and conjugation mapping calculation for read_mwa_corr_fits
• copy method to UVCal and UVBeam objects
• chunks to UVH5.write_uvh5 and UVData.write_uvh5 for HDF5 dataset chunking.
• multidim_index to UVH5.read_uvh5 and UVData.read for multidimensional slicing into HDF5 datasets

Changed

• Various serialized calculations in uvdata.py, uvbeam.py, and utils.py to be vectorized with numpy
• Miriad interface was re-written from a hand written CPython interface to a Cython interface which dynamically creates the CPython during package setup/build.
• uvfits, calfits and beamfits files should now be read faster due to a simplified handling of fits header objects, especially when the history is very long.
• The UVData methods set_drift, set_phased, and set_unknown_phase_type have been made private. The public methods will be removed in version 2.2.

[2.0.1] - 2020-3-24

Changed

• UVData allows conjugation of metadata only objects.
• Handling of strings in UVFlag files has been made more widely compatible.

Added

• Option to provide parameters for RectBivariatespline through interp
• weights_square_array (optional) parameter on UVFlag - stores sum of squares of weights when converting to waterfall
• frequency_average method on UVData to average data along the frequency axis.

Fixed

• A bug in select where baseline-polarization tuples would not be conjugated correctly in UVData and UVFlag, and select on read for Miriad files.
• metafits_ppds.fits files can now be passed to mwa_corr_fits.read without throwing an error.
• UVParameters that are array_like and have NaNs are now properly identified as equal if the NaNs are in the same locations and all non-NaN entries are equal.
• A bug in mwa_corr_fits.read in filling flag and nsample arrays.
• A bug in UVData.downsample_in_time in calculating the number of new blts.

[2.0.0] - 2020-2-12

Changed

• All references to Python 2 removed from codebase.

Added

• Routine flagging of MWA coarse band edges and center channels, as well as beginning and end integrations. Only done during read_mwa_corr_fits.
• Added a return_weights_square option to utils.collapse function, which returns the sum of the squares of the weights.

Removed

• Previously deprecated code marked for removal in version > 1.5:
• reading multiple files with file format specific read functions (e.g. read_mirad). Multi-file reads can only be performed with uvdata.read
• read_metadata keyword in various specific read functions (e.g. read_miriad)
• metadata_only keyword in select and get_redundancies
• uvdata.miriad.read_miriad_metadata
• phase_center keyword in uvdata.read_mwa_corr_fits
• phase_data keyword in uvdata.read_mwa_corr_fits
• uvdata.get_antenna_redundancies
• uvdata.get_baseline_redundancies
• uvdata.uvfits.read_uvfits_metadata
• uvdata.uvfits.read_uvfits_data

[1.5.0] - 2020-1-15

Added

• Support for reading the MWA full embedded element beam into a UVBeam object.
• New time_range keyword to select so exact times don't need to be specified (also added to read methods for select on read).
• Support for rephasing phased data including on read, __add__ and fast_concat so that files with different phasing can be read in together.
• sum_vis and diff_vis for summing or differencing visibilities in the data_array.
• read_mwa_corr_fits for reading in MWA correlator gpubox files and applying cable corrections.
• eq_coeffs for storing equalization coefficients and remove_eq_coeffs for removing them.
• utils.apply_uvflag for applying UVFlag objects to UVData objects

Fixed

• Fixed utils.uvcalibrate to handle x_orientation attribute
• Arrays of file names can now be passed to read (not just lists).
• run_check is no longer turned off in read_uvfits and read_uvh5 when read_data is False.
• Redundancy finder will now error if any baselines appear in multiple groups.
• A bug in UVCal objects that prevented them from properly getting data with ee/nn-style polarizations.
• a bug in UVFlag where x_orientation was not set during initialization.
• A bug in UVCal.read_fhd_cal that caused calibration solutions to be approximately doubled.
• A bug in UVFlag where polarization array states were not updated when using force_pol keyword in to_antenna and to_baseline
• A bug in UVFlag.to_baseline() where force_pol kwarg did not work for UVData Npols > 1
• UVData.read_uvfits no longer breaks if there are non-ascii bytes in antenna names (which CASA sometimes writes).

Deprecated

• Reading in multiple files (or file sets) using file-type specific read methods (e.g. read_uvfits) in favor of the generic read method.
• The phase_center and phase_data keywords to read_mwa_corr_fits in favor of phase_to_pointing_center and the phase_center_radec keyword in the generic read method.
• Support for reading only the header (not all the metadata) of uvfits files.
• The read_uvfits_metadata and read_uvfits_data methods on the UVFITS object.
• The read_miriad_metadata method on the Mirad object.

[1.4.2] - 2019-10-15

Added

• copy method for UVData, which can optionally make a copy of just metadata
• upsample_in_time, downsample_in_time, and resample_in_time methods on UVData objects
• utils.uvcalibrate(.., undo=True) kwarg for undo-ing a calibration.
• utils.uvcalibrate updates UVData.vis_units if UVCal.gain_scale is set.
• UVCal.gain_scale non-required attribute
• UVData.get_redundancies method to replace old get_baseline_redundancies and get_antenna_redundancies.
• option for UVBeam.interp to return a new beam object.
• UVFlag information on Read The Docs

Changed

• UVData.phase_to_time now accepts a float as an input. Assumes float represents a JD.
• Added optional acceptability check for utils.LatLonAlt_from_XYZ
• Use astropy_healpix rather than healpy for HEALPix functionality because healpy has a GPL license which is incompatible with ours.
• h5py is now a required package instead of an optional one.
• Phasing now supports metadata only UVData objects
• utils.get_baseline_redundancies uses scipy pdist functions instead of for loops (faster)
• UVData.get_antenna_redundancies will no longer automatically conjugate baselines.
• UVData.get_baseline_redundancies and UVData.get_antenna_redundancies have been combined.
• UVFlag inherits from UVBase object.
• UVFlag objects can now convert from antenna type to baseline type
• UVFlag objects can now be initialized without inputs

Fixed

• A bug in UVBeam._interp_freq where kind parameter was not passed for real-only beams
• A bug in get_antenna_redundancies for nearly N-S baselines.
• A bug where conj_pol could not handle cardinal direction polarizations.
• A bug that gave the wrong error message when calling UVData.phase_to_time without an Astropy Time object.

Deprecated

• UVData.get_baseline_redundancies and UVData.get_antenna_redundancies will be deprecated in version 1.6.1

[1.4.1] - 2019-08-2

Added

• metadata_only property on UVData to automatically detect if data-like arrays are present
• support for combining metadata only objects and reading in multiple files as metadata only
• utils.uvcalibrate flag propagation bug fix
• UVCal.ant2ind indexing bug fix
• UVCal.get_* methods for accessing data arrays with antenna-polarization keys
• utils.uvcalibrate for automated calibration of UVData by UVCal

Fixed

• Fixed a bug in select that caused bls and antenna_names/numbers to be or'ed rather than and'ed together.
• Fixed a bug where baseline_to_antnums could accept a numpy array as input but not other array_like objects.

Changed

• removed new_object keyword from UVBeam._interp_freq in favor of new functionality in UVBeam.interp

[1.4.0] - 2019-05-23

Added

• Option in UVBase.check() to ignore whether required parameters are set.
• made an option to not save the lst_array to uvfits files.
• conjugate_bls option to UVData.get_antenna_redundancies
• UVData.conjugate_bls method to conjugate baselines to get the desired baseline directions.
• UVData.reorder_blts method to reorder the data along the blt axis (and optionally also conjugate baselines), and a new blt_order optional parameter on UVData objects to track the ordering (including through read/writes).
• lst_array is now saved to UVFITS files (even though it's not a standard parameter) so that it doesn't have to be recalculated

Fixed

• Fixed init logic in UVFlag.
• Fixed a bug in how FHD uvw vectors were oriented (and visibilities were conjugated)
• Fixed a bug in UVData.inflate_by_redundancy when Nblts is not equal to Nbls * Ntimes.
• Fixed a bug in UVData when reading in an FHD file with a single time integration.
• Fixed a bug in how the longitudinal branch cut was handled in beam interpolation
• Changed the way interpolation splines are saved in UVBeam to fix errors related to polarization selections.
• Python 3: np.string_ call now uses keepdims=True to guard against antenna_names being cast as an array.

Changed

• Testing framework changed from nose to pytest.
• uvdata.set_lsts_from_time_array only calculates lsts for unique elements in time_array.

[1.3.8] - 2019-05-01

Added

• Optional x_orientation parameter to utils functions polstr2num, polnum2str, jstr2num and jnum2str to allow for E/N based polarization strings (rather than just x/y based ones)
• New optional x_orientation parameter on UVBeam (paralleling UVData and UVCal), with read/write support in beamfits
• Added x_orientation as an optional parameter in read_cst_beam and in cst settings yaml files.
• All str2num or num2str calls on UVData and UVBeam pass the object's x_orientation
• New UVData.fast_concat method to allow fast concatenation of UVData objects (or files) along a particular axis.
• Added preliminary UVFlag module from hera_qm to pyuvdata. Will eventually promote to UVBase object, but for now this is undocumented functionality.

Deprecated

• Defined 'east' and 'north' as the allowed 'x_orientation' values in UVData and UVCal, Backwards compatiblity support exists for 'E' and 'N' values
• UVData.order_pols method in favor of UVData.reorder_pols.

Fixed

• Building pyuvdata on macOS now targets minimum macOS 10.9 if run on macOS 10.9 or above
• Possible bug where check_variables dictionary can change size during read_miriad call

[1.3.7] - 2019-04-02

Added

• Added add_to_history kwarg to UVH5.write_uvh5_part
• _healpix_interp_bilinear as a new interpolation method in UVBeam
• freq_interpolation_kind added as an attribute to UVBeam
• tol added as keyword argument to UVBeam._interp_freq which allows for a fast return of data_array slice if nearest-neighbor frequencies are all within the distance tolerance.
• polarizations added as keyword argument to UVBeam interpolation methods.
• Support for a yaml settings file to collect and propagate metadata for CST beam files.

Changed

• UVBeam._interp_freq returns both interp_data and interp_bandpass, instead of just the former.

Fixed

• Combining overlapping data along multiple axes (most common when reading in multiple files) no longer errors.

[1.3.6] - 2019-02-15

Added

• keep_all_metadata keyword for optionally discarding unused metadata when performing a select operation.

Changed

• Extends run_acceptability_check for UVH5 metadata in check_header function.

Fixed

• Antenna numbering bug in redundancy methods. It wasn't using the correct antenna numbers to make baseline indices.
• Redundancy code returns one group if all baselines are redundant. Previously returned each baseline as a separate group
• Redundancy code finds unique baselines along baseline_array without assuming Nblts = Nbls * Ntimes. Previously assumed Nblts = Nbls * Ntimes and attempted to slice array.
• "inflate_by_redundancy" method errored when phase_type == phased, due to _set_u_positive using phased uvw coordinates. It now uses ENU frame uvw coordinates.

[1.3.5] - 2018-12-20

[1.3.4] - 2018-12-19

Added

• Methods on UVData objects to compress/inflate data by redundant baselines.
• Convenience functions on UVData for finding redundant baselines (calling the corresponding utils functions)
• memo describing the UVH5 format
• read/write support for uvh5 files with integer datatypes for visibilities
• Option to only do the select on the metadata. This is useful for partially defined objects as in pyuvsim setup or after reading only the metadata from a file.
• support for python3.7

Changed

• UVdata.get_ENU_antpos() now defaults to using the telescope_location as the center rather than the median antenna position.
• UVBeam.efield_to_pstokes() no longer restricted to healpix coordinates
• latitude and longitude in uvh5 files are written in degrees instead of radians.
• Fixes a bug in redundancy methods for when there are no redundant baselines.

Fixed

• _key2inds now properly reorders polarization axis for conjugated visibilities. This also effects the get_data function.
• long strings are saved correctly in miriad files from python3

[1.3.3] - 2018-11-01

Added

• option to save splines for reuse in UVBeam.interp function

Changed

• improve string handling for uvh5 files
• changed top-level import structure to exclude file-specific class (e.g. UVFITS, CALFITS) and base classes (UVBase, UVParameter) and to not import utility functions into the top-level namespace

Deprecated

• Support for UVData objects without antenna_positions. Antenna positions will be required in a future version.

[1.3.2] - 2018-09-27

Added

• Utility functions to identify redundant baselines (either by baseline or antenna pair)
• Reading FHD layout files to get antenna positions
• Polarization dict constants and parsing functions in utils.py for mapping between polarization strings and numbers

Changed

• LST array is now optional in uvh5 files
• polarization string capitalization was unified throughout: use lower case except for Stokes parameters
• integration_time is now a vector of length NBlts instead of a scalar

Deprecated

• Support for FHD inputs without layout files (containing antenna positions).

Fixed

• flags are always returned as a boolean array from UVData.get_flags
• integration_time, uvw_array and lst_array are now always checked for consistency when adding UVData objects
• consistency checks on baseline lengths now uses the uvw_array tolerances

[1.3.1] - 2018-07-24

[1.3] - 2018-07-22

Added

• compatibility with python 3 (retaining python 2 compatibility)
• generic UVData.read method for all input file types, including select on read options
• partial write support for uvh5 file format
• partial read support for uvfits, miriad and uvh5 file formats (including only reading metadata and select on read)
• new uvh5 file format: an HDF5 file standard matched to UVData objects
• new method to calculate uvws from antenna positions
• UVBeam.get_beam_area and UVBeam.get_beam_sq_area functions to calculate beam integrals, including for pseudo-Stokes beams
• beam interpolation methods, to any set of points and to healpix pixel centers
• a script to renumber antennas for CASA compatiblity if there are fewer than 256 antennas but numbers higher than that
• memo describing the beam fits file format
• method to peak normalize UVBeam objects
• support for reading FHD calibrations into UVCal objects
• support for sky-based calibration metadata in UVCal and the calfits file format
• method to convert E-field beams to power beams
• UVData.get_ENU_antpos method to get ENU coordinates from antenna positions
• support for extra_keywords on UVCal objects

Changed

• Major overhaul of phasing code, see the phasing memo in docs/references for more details
• Make all earth location coordinate conversions use same axes order (n_points, 3)
• replaced ant_pair_nums keyword in UVData.select and partial read methods with bls which supports lists like [(0,1,'xx'), (2,3,'yy')]
• extracted miriad wrappers from aipy, removing aipy as a dependency

Fixed

• Fixed error when combining auto-correlation only and cross-correlation only UVData objects
• Fixed error with the UVData.select function using a single antenna name
• Fixed bugs with UVData.get_data, UVData.get_flags, and UVData.get_nsamples for conjugated baseline polarizations
• Fixed a bug that caused a memory error in UVData.write_uvfits
• Fixed bugs in interpreting the uvw direction convention for uvfits
• Fixed a bug in reading azimuth locations from CST beam files
• Fixed a bug reading in single frequency uvfits files
• Fixed a bug in reading MWA Cotter measurement sets
• Fixed units errors in cal fits files
• Fixed a serious bug where data was overwritten in the add functions if the axes were out of canonical order
• Fixed scrambled data ordering in add function

[1.2.1] - 2017-11-09

Fixed

• Fixed a bug in parsing frequencies from CST file names

[1.2] - 2017-11-08

Added

• support doctest in the tutorial
• utility functions for converting between Jones numbers and polarization strings
• support for antdiam variable in miriad files
• module for reading a CST file into a UVBeam object
• utility functions for converting to rotated ECEF coordinates from ECEF coordinates
• support reading in a list of calfits files
• include extra_keywords to miriad files
• __add__ method for UVCal objects
• antenna_diameters value to UVData objects
• parse_ants method on UVData objects
• x_orientation value to UVData objects
• "smart slicing" functionality to UVData objects
• convenience methods on UVData objects for easily getting data and metadata
• UVBeam object
• in-place selection for UVData objects
• total_quality_array value on UVCal objects
• __add__ method for UVData objects
• utility functions for converting to local ENU coordinates from ECEF coordinates
• convert_to_gain method on UVCal delay-type objects
• read-only support for CASA measurement sets into UVData objects
• select method on UVCal objects

Changed

• antenna names in miriad saved as strings instead of arrays of ASCII hex values

Fixed

• baseline-time axis mis-ordering in add function
• handling of antenna positions in miriad and uvfits files
• selecting autocorrelation data from UVData objects
• indexing of spectral windows in calfits files
• handling of total_quality_array in UVCal objects when selecting a subset of data

[1.1] - 2017-04-14

(historical information needs to be filled in)