Winkel Tripel projection.
The WINKEL command has these optional parts:
Parameter Description 1 Latitude of standard parallels N&S
2 Latitude of standard parallels N&S
3 Latitude of standard parallels N&S
In MicroCAM versions 1.4 and greater. Not in CAM.
The Winkel Tripel is constructed by averaging the X then the Y outputs of the Equirectangular & Aitoff projection formulas.
If not specified, the standard parallels for the Equirectangular portion of the projection are set to 50.467° (50° 28') North & South as used by Winkel; Bartolomew used a value of 40° for his atlases.
This projection as been adopted by the National Geographic Society for its World Reference Map.
Selects the Winkel Tripel projection as specified by Winkel.
Selects the Winkel Tripel projection as used by Bartholomew.