Options: Reprojection
In reproject mode, Sanchez reprojects geostationary IR images into plate carrée projection. See Reprojection modes for details of the different reprojection options.
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:
All modes support no cropping (--nocrop) to perform no cropping of the target image. With this mode enabled, the output image contains a full plate carrée projection and is suitable for reprojection to a globe using an external tool.
All reprojection modes support custom latitude and/or longitude crop via --lat and --long. Both take an argument of the minimum and maximum values in degrees, of the format <min>:<max>, for example:
sanchez reproject -s C:\images\goes17\fd\fc\2020-09-12\GOES17_FD_FC_20200912T210031Z.jpg -o output.jpg --lat -33.6:-48 --lon 165.1:179.3
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
Give a target timestamp, Sanchez identifies images which are either captured at or near the timestamp. The maximum time tolerance for determining whether an image is included is defined by -d / --tolerance and is specified in minutes. If no tolerance is provided, the default of 30 minutes is used.
Of particular use when producing a timelapse, the minimum number number of required satellites can be specified via -m / --minsatellites. When this is set, only images are produced which contain at least the specified number of satellites.