I am using an app called farsite that outputs shapefiles that show how forest fires will grow. I am getting output in coordinates as X and Y values rather than (lon,lat) and am looking for a conversion routine to (lon, lat). If I knew the name of the coordinate system it might help my search, but I do not even know that. I have gone to google maps and have looked at the expected (lon, lat) so I have a rough translation equation, but I am sure that someone else has a better one (mine is linear with a scale and offset, which I fear is too simplistic)
Here is a sample point (X, Y): 162206 386691 (Lon,Lat): -115.326662 47.582952
Can someone please steer me to a reference or conversion routine?
Thanks in Advance - Steve Tufty