Is it possible to only use a subset of an image that is referenced in a mapfile? In the mapfile below there are two FAA sectional charts. There are borders on the charts that I don't want on the final composite image.
If the "EXTENT" actually clipped the image before rendering, I could get what I'm looking for, but it only seems to be used to determine overlap with the bounds of the output image (and not always then). I'm sure I could use something like gdal_translate to preprocess all of the charts, but that a really tedious sort of task and results in extra images lying around. Would prefer to use source images and have the mapfile pull the correct bits out of them. The charts are available at: http://aeronav.faa.gov/index.asp?xml=aeronav/applications/VFR/chartlist_sect Xander # # MapServer map file for FAA Sectional Raster charts (test case w/ only two charts) # MAP NAME "FAA Sectional Raster" IMAGETYPE PNG SIZE 256 256 DEBUG OFF UNITS DD SHAPEPATH "/MapData/FAA/SectionalRaster" PROJECTION "init=epsg:4269" END WEB METADATA "wms_srs" "EPSG:900913 EPSG:4326" "ows_enable_request" "*" END END LAYER NAME "LA North" DATA "Los Angeles 89 North.tif" STATUS ON TYPE RASTER DUMP TRUE PROJECTION "auto" END END LAYER NAME "LA South" DATA "Los Angeles 89 South.tif" STATUS ON TYPE RASTER DUMP TRUE PROJECTION "+proj=lcc +lat_1=38.66667 +lat_2=33.33333 +lat_0=34.16667 +lon_0=-118.5" END EXTENT -122 32 -119 34 END END END
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