update offset when cropping since we crop from the top/left more than from the bottom/right
update offset when cropping since we crop from the top/left more than from the bottom/right

USGS-Astrogeology/GDAL_scripts,thareUSGS/GDAL_scripts,thareUSGS/GDAL_scripts,thareUSGS/GDAL_scripts,USGS-Astrogeology/GDAL_scripts,USGS-Astrogeology/GDAL_scripts,thareUSGS/GDAL_scripts,USGS-Astrogeology/GDAL_scripts