DCL:GRPH1:STPACK: Transformation Function
STPACK is a collection of functions that handle transformation between coordinates. The coordinate transformation can be divided into the following three steps:
The normalization transformation can further be divided into the following transformations.
Here, basic transformation refers to the essential part of normalization transformation, and in a rectangular coordinate, is the normalization transformation itself. In a map projection coordinate, the basic transformation is the transformation after the rotation of the coordinates (transformation by MATH1/maplib). In a basic transformation, the angle is always represented in radians.