I am trying to work with several aerial photos which are in Maine State Plane West, NAD83, US feet. This is a commonly-used projection in Maine (along with Maine East), yet it is not found in the pcs.csv file that comes with FWTools/GDAL. In fact although there are several iterations of state plane for Maine in that file, none are in feet.
I have hacked around a bit without success. The two EPSG codes I am trying to add are 26847 http://spatialreference.org/ref/epsg/26847/ and 26848 http://spatialreference.org/ref/epsg/26848/. I added the values below to the table based on what I saw as examples in other entries: COORD_REF_SYS_CODE COORD_REF_SYS_NAME UOM_CODE SOURCE_GEOGCRS_CODE COORD_OP_CODE COORD_OP_METHOD_CODE SHOW_CRS DEPRECATED PARAMETER_CODE_1 PARAMETER_VALUE_1 PARAMETER_UOM_1 PARAMETER_CODE_2 PARAMETER_VALUE_2 PARAMETER_UOM_2 PARAMETER_CODE_3 PARAMETER_VALUE_3 PARAMETER_UOM_3 PARAMETER_CODE_4 PARAMETER_VALUE_4 PARAMETER_UOM_4 PARAMETER_CODE_5 PARAMETER_VALUE_5 PARAMETER_UOM_5 26847 NAD83 / Maine East (ftUS) 9003 4269 11831 9807 1 0 8801 43.4 9110 8802 -68.3 9110 8805 0.9999 9201 8806 300000 9001 8807 0 9001 26848 NAD83 / Maine West (ftUS) 9003 4269 11832 9807 1 0 8801 42.5 9110 8802 -70.1 9110 8805 0.999967 9201 8806 900000 9001 8807 0 9001 Yet when I use those EPSG codes the imagery does not align correctly (way way off) in GIS software including ArcGIS. I tried two other methods, one using the PROJ4 description and secondly using the ESRI projection file for NAD_1983_StatePlane_Maine_West_FIPS_1802_Feet. In all cases the imagery is way way way out of Maine. Examining the image in ArcGIS shows it is Transverse Mercator and has the same parameters as State Plane feet, but it's screwed up. Yet if I'm in ArcGIS and I assign the projection file to the image manually, it works fine. I intend to put the imagery in MapServer WMS, so I need to get this worked out in GDAL first. Any suggestions? ********** Michael Smith State GIS Manager Maine Office of GIS
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