projection.tcl.
projection code
p0
p1
p2
…
projection_x and projection_y
for specified map projection.
code is map projection code (default: CylindricalEquidistant) as follows:
CylindricalEquidistant: p0 = x-origin (default: "")
Mercator: p0 = x-origin (default: "")
NorthPolarEquidistant: North Polar azimuthal equidistant
SouthPolarEquidistant: South Polar azimuthal equidistant
SouthPolarStereographic: As used by IASOS
p0 p1 p2 … define parameters of the projection.
Some projections use p0 to specify an "x-origin". This is the
minimum result to be returned by projection_x. If x-origin is "" then
there is no defined minimum result.