Lat 0, Long 0 is at X -850000, Y -780000
Lat 1, Long 1 is at X -833000, Y -764000
X Scale (Longitude Divisor) is 17000
Y Scale (Latitude Divisor) is 16000
X 0, Y 0 is at Lat 48.75, Long 50
Also, using TPCoords to set Lat and Long, then checking X and Y with CopyCoordinatesToClipboard seems to be the most accurate way to map the two coordinate systems. It seems odd to then translate the accurate, integer x and y diffs and scale into derived, floating point latitude and longitude shifts in the source. The X/Y shift is just your ccc output at "TPCoords 0 0 40000"
The X/Y scale is the diff in x and y between 0,0 and 1,1
Lat 0, Long 0 is at X -850000, Y -780000
Lat 1, Long 1 is at X -833000, Y -764000
X Scale (Longitude Divisor) is 17000
Y Scale (Latitude Divisor) is 16000
X 0, Y 0 is at Lat 48.75, Long 50
Also, using TPCoords to set Lat and Long, then checking X and Y with CopyCoordinatesToClipboard seems to be the most accurate way to map the two coordinate systems. It seems odd to then translate the accurate, integer x and y diffs and scale into derived, floating point latitude and longitude shifts in the source. The X/Y shift is just your ccc output at "TPCoords 0 0 40000"
The X/Y scale is the diff in x and y between 0,0 and 1,1