Hello All; I have been attempting over the last few months to invert the LVCS projection in a Terrex Terrapage archive (.txp) file to retrieve an accurate latitude, longitude, and altitude given the X, Y, and Z coordinates in the file. I have tried the proj4 library, with a stereographic projection, and an orthographic projection, to no avail. I have had some success with smaller areas, for instance 2 degrees in latitude and 2 degrees in longitude, but with larger areas, the pj_inv function fails to give me accurate results. Does anyone have any information as to just what projection parameters the LVCS projection is, such as "+proj=stere +R=", or the like? For an example, if I have a latitude of 31 North and a longitude of 49 East, I have tried the following two projections, and both fail to give me accurate results: "+proj=ortho +lat_0=31N +lon_0=49E" "+proj=stere +lat_0=31N +lon_0=49E" Thanks for any help, Leonard Smith
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