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Subroutine: IRCO_TORECT.

Purpose: Transform from spherical to rectangular coordinates.

Category WORLD COORDINATES, IRAS

File: irco.shl

Author: 85 Jul 17 Uwe Peppel.

Use:
call IRCO_TORECT (
lon, lat I doubleprecision arrays (n),
xyz O doubleprecision array (3,n),
n I integer.
)
lon, lat (in radian:) longitudes and latitudes,
xyz rectangular coordinates,
n number of coordinates to transform.
Description:
Transformation according to:
x = cos(lat) * cos(lon),
y = cos(lat) * sin(lon),
z = sin(lat).
In this module (psi, theta) is not applicable, use:
call IRCO_TORECT ( psi, pi/2 - theta, xyz, n) !!
Updates:
90 Apr 24 Sjag Steensma; documentation changed, n-coordinates,
87 May 25 Timo Prusti; unification of versions,
87 May 25 Romke Bontekoe; documentation changed.