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MAP_PROJ_INIT [message #78194]

Sat, 29 October 2011 03:09

lecacheux.alain
Messages: 325
Registered: January 2008

Senior Member

In order to process some GPS data, I logically write:
IDL> map = map_proj_init(101, ELLIPSOID=24, ZONE=31)
wanting to use WGS84 ellipsoid and UTM projection (zone 31 is for
Paris), for further use of the "map_proj_forward" function. Then :
IDL> print, map.A, map.E2, map.PROJECTION
6370997.0 0.00000000 20
shows that IDL rather chooses the SPHERE and the projection n°20.
Moreover this projection is not referenced in the IDL_help, the
projection index ranging from 0 to 19.
Forcing GCTP keyword to 1 does not change anything.
What does it mean ?
alain.

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