I need to convert an old-style projection file (created with Global Mapper) to a WKT format for use in my GIS program (ArcMap or GDAL or whatever). The problem is that my old-style projection file has an additional parameter called "State plane scale factor" which does not seem to be recognized. My old-style projection file is in the following format:
Projection STATE_PLANE Datum NAD83_NEW_MEXICO_HPGN Zunits NO Units FEET Zone 3002 Xshift 0.000000 Yshift 0.000000 Parameters 1.000210000 /* state plane scale factor
I can get GDAL (and probably ArcMap) to recognize that this file contains a New Mexico Central NAD83 projection, but neither does anything with the state plane scale factor. I found this link that describes multiplying the false easting, northing, and scale factor by the local scale factor but this did not seem to fix the problem (though I think it's on the right track). GlobalMapper will only save to the above format and will not convert this to a WKT format that can be used by other software programs. The New Mexico Central projection is based on the Transverse Mercator projection, I'm trying to figure out a way to use the base parameters for this projection with Transverse Mercator and change them using the state plane scale factor. Does anybody have any idea of the correct way to convert this old-style projection to the correct WKT?