INITVC

Name

initvc

Purpose

Compute unit vectors for a spherical surface map.

Description

Calling Sequence

initvc,nx,ny,xn,yn,zn

Inputs

nx - Size of map in x direction (same as longitude)
ny - Size of map in y direction (same as latitude)
If nx & ny are non-zero, the map is assumed to be a rectangular
projection map. If ny is zero, then nx is the total number of
annuli and the "optimal" tiling scheme is assumed.

Optional Input Parameters

Keyword Input Parameters

Outputs

xn,yn,zn - Unit vector for each tile in the map. These will have the
same dimensionality as the map, ie., nx by ny or just nx.

Keyword Output Parameters

Common Blocks

Side Effects

Restrictions

Procedure

Modification History

Written by Marc W. Buie, Lowell Observatory, 1998 Sep 7
2003/09/18, MWB, added rectangular map option code