I’m trying to write a script that can automatically use GDAL to crop the informational border from the FAA’s published sectional charts (GeoTIFF) found here:
I know that I can use gdal_translate -projwin ulx uly brx bry to crop it to a coordinate range, but I’m not sure where to get the values for the map area aside from by hand, or if there is possibly a better way to crop it.
Is the information necessary to crop the chart extractable from the files they provide?