Merge branch 'gl35_coordinateless' into 'develop'

MAINT: model WPS data as coordinate-less DataArray

Closes #35

See merge request !35

docs/install.rst

@@ -2,6 +2,19 @@
 Installing emiprep
 ==================
 
+Required dependencies
+---------------------
+
+* Python 2.7, 3.4, 3.5, or 3.6
+* `numpy <http://www.numpy.org/>`__ (1.7 or later)
+* `pandas <http://pandas.pydata.org/>`__ (0.15.0 or later)
+* `xarray <http://xarray.pydata.org/>`__ (0.9.0 or later)
+* `netcdf4-python <https://unidata.github.io/netcdf4-python/>`__ (1.2.1 or later)
+
+
+Instructions
+------------
+
 The recommended way to install emiprep is using the Anaconda_ platform.  If you
 don't have Anaconda installed on your system yet, you can use the minimal
 miniconda_ installation.

emiprep/regrid/cdo.py

@@ -65,17 +65,13 @@ def _metgrid_to_cdo_grid_info_extraction(fn_metgrid):
     lat_corner = xr.DataArray(
         np.zeros((lat_center.shape[0], lat_center.shape[1], 4),
                  dtype=np.float32),
-        {'grid_ysize': lat_center['grid_ysize'],
-         'grid_xsize': lat_center['grid_xsize'],
-         'grid_corners': np.arange(1, 5)},
-        ['grid_ysize', 'grid_xsize', 'grid_corners'], name='grid_corner_lat')
+        dims=['grid_ysize', 'grid_xsize', 'grid_corners'],
+        name='grid_corner_lat')
     lon_corner = xr.DataArray(
         np.zeros((lat_center.shape[0], lat_center.shape[1], 4),
                  dtype=np.float32),
-        {'grid_ysize': lat_center['grid_ysize'],
-         'grid_xsize': lat_center['grid_xsize'],
-         'grid_corners': np.arange(1, 5)},
-        ['grid_ysize', 'grid_xsize', 'grid_corners'], name='grid_corner_lon')
+        dims=['grid_ysize', 'grid_xsize', 'grid_corners'],
+        name='grid_corner_lon')
 
     for ii, jj in product(range(lat_center.shape[0]),
                           range(lat_center.shape[1])):
@@ -87,9 +83,7 @@ def _metgrid_to_cdo_grid_info_extraction(fn_metgrid):
     # need to include data variable in nc file, else CDO will complain
     dummy = xr.DataArray(
         np.zeros((lat_center.shape[0], lat_center.shape[1]), dtype=np.float32),
-        {'grid_ysize': lat_center['grid_ysize'],
-         'grid_xsize': lat_center['grid_xsize']},
-        ['grid_ysize', 'grid_xsize'], name='dummydata')
+        dims=['grid_ysize', 'grid_xsize'], name='dummydata')
     dummy.attrs['coordinates'] = 'grid_center_lon grid_center_lat'
 
     # fix metadata

setup.py

@@ -23,7 +23,7 @@ def _check_requirements():
     try:
         import xarray
     except ImportError:
-        requirements += ['xarray>=0.8']
+        requirements += ['xarray>=0.9']
 
     try:
         import netCDF4