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DCL:GRPH2:UMPACK: Map Projection Routines: Explanation of Subroutines: Control

12.2.1 UMSCNT

1.

Function

Specifies the "contact" of the plane of projection.

2.

Call

CALL UMSCNT(UXC, UYC, ROT)

3.

Explanation of Parameters

UXC,UYC	(R)	The longitude and latitude of the contact.
ROT	(R)	The inclination of the central meridian. (clockwise)

4.

Notes

(a)

This information is used by UMPFIT.

(b)

In a normal cylindrical projection (normal aspect),  UYC=0 and ROT=0. Otherwise, it is in an oblique aspect.

(c)

In a conical projection, UYC becomes the standard meridian unless the standard meridian (STLAT1) is specified. When the standard meridian is specified, a cone corresponding to it is set, and the cone is inclined so that it comes into contact at (UXC, UYC). Such a projection is in an oblique aspect.

(d)

In the azimuthal projection, (UXC,UYC,ROT) is synonymous with the pole of the map projection (PLX,PLY,PLROT).