SPCS83

         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.

Links:

• http://www.ngs.noaa.gov/PC_PROD/SPCS83/ (zip archive)
• http://www.ngs.noaa.gov/TOOLS/index.shtml#SPCS83 (discussion)

• spcs83.for = Opening Menu
  • tblspc.for
  • gppc83.for = CONVERT GEODETIC POSITIONS TO STATE PLANE COORDINATES
    • tblspc.for
    • intgp.for = convert GP to PC in interactive mode
      • hdgp.for = write an output screen (GP TO PC)
      • drgppc.for = underlying GP to PC algorithm
        • [see below]
    • batgp.for = convert GP to PC in batch mode
      • claim.for
      • hdgp.for = write an output screen (GP TO PC)
      • drgppc.for = underlying GP to PC algorithm
        • [see below]
  • pcgp83.for = CONVERT STATE PLANE COORDINATES TO GEODETIC POSITIONS
    • tblspc.for
    • intpc.for = convert PC to GP in interactive mode
      • hdpc.for = write an output screen (PC TO GP)
      • drpcgp.for
        • [see below]
    • batpc.for = convert PC to GP in batch mode
      • claim.for
      • hdpc.for = write an output screen (PC TO GP)
      • drpcgp.for
        • [see below]
  • lstftn.for = PRINT THE OUTPUT FILE ON THE PRINTER

• lconst.for
• lamd1.for = convert GP (lat and long) to PC (x and y)
• formgp.for = read and interpret the
  • todms.for = convert radians to degrees/minutes/seconds
  • hdgp.for = write an output screen (GP TO PC)
• tconst.for
• tmgrid.for
• formgp.for
  • todms.for = convert radians to degrees/minutes/seconds
  • hdgp.for = write an output screen (GP TO PC)
• oconst.for
• skewd.for
• formgp.for
  • todms.for = convert radians to degrees/minutes/seconds
  • hdgp.for = write an output screen (GP TO PC)

• lconst.for
• lamr1.for
• formpc.for =
  • todms.for = convert radians to degrees/minutes/seconds
  • hdgp.for = write an output screen (GP TO PC)
  • verdms.for
• tconpc.for =
• tmgeod.for =
• formpc.for
  • todms.for = convert radians to degrees/minutes/seconds
  • hdgp.for = write an output screen (GP TO PC)
  • verdms.for
• oconst.for =
• skewr.for =
• formpc.for =
  • todms.for = convert radians to degrees/minutes/seconds
  • hdgp.for = write an output screen (GP TO PC)
  • verdms.for