The equidistant conic projection was described by the Greek philosopher Claudius
Ptolemy about A.D. 150. It is neither conformal or equal-area, but serves as a
compromise between them. The scale is true along all meridians and the
The projection is set with d or D. The projection center is set by lon0/lat0
and two standard parallels for the map are set with lat1/lat2. The figure size is set
with scale or width.