Options: Reprojection
In reproject mode, Sanchez reprojects geostationary IR images into plate carrée projection. In this mode, the following additional options are available:
All modes support optional auto-cropping (-a / --autocrop) to crop target images to a tight rectangle. This option loses some source imagery, but maximises the total area.
The example below is without and with autocrop enabled:
When rendering a single image with no underlay and a .png output file is specified, the image is rendered on a transparent background.
If you already have a full colour composite, use the -U / --nounderlay mode combined with -L / --noadjustlevels to create an image which has no colour correction or underlay applied.
The following example also preserves the original 2km spatial resolution (5424x5424px image) by using the -r 2 flag.
sanchez reproject -s C:\images\goes17\fd\fc\2020-09-12\GOES17_FD_FC_20200912T210031Z.jpg -o output.jpg -ULa -r 2