This is an overview of the SPCS83 program files. The core of this is the conversion from latitude/longitude ("geodetic position" or GP) to X/Y ("planar coordinates" or PC). The command-line interactive FORTRAN program reads in the values, then reads in the constants for that grid section from a data file, then calculates the change. The core equations are in the code file lamd1.for.


drgppc.for = underlying GP to PC algorithm
drpcgp.for = underlying PC to GP algorithm
John H. Kim <jhkim@darkshire.net>
Last modified: Fri May 21 16:44:00 2004