| Re: IDL5.2: map_proj_info [message #13813 is a reply to message #13801] |
Wed, 09 December 1998 00:00  |
davidf
Messages: 2866
Registered: September 1996
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Senior Member |
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Andy Loughe <afl@cdc.noaa.gov> used his secret decoder ring
to write:
> <!doctype html public "-//w3c//dtd html 4.0 transitional//en">
> <html>
>
> <p>Hello,
> <p>I have tried to use "map_proj_info" within IDL5.2
> <br>(see page 67 of What's New in IDL 5.2), but have
> <br>had no luck with it.
> <p>Can someone give me a hint on how this potentially
> <br>useful routine works? There is no entry for this routine
> <br>in the online help, and I cannot find the source in
> <br>$IDL_DIR/lib (bad sign).
This is from my IDL 5.2 on-line help. Sure you are
using the correct help file?
Cheers,
David
The MAP_PROJ_INFO routine returns information about the current map and/or the
available projection. Mapping parameters should be setup via a call to MAP_SET
before using MAP_PROJ_INFO.
Calling Sequence
Result = MAP_PROJ_INFO [, iproj]
Arguments
Iproj
The projection index. If the CURRENT keyword is set, then the index of the
current map projection is returned in Iproj.
Keywords
AZIMUTHAL
Set this keyword if the projection is azimuthal. If the projection is not
azimuthal, set this keyword to zero (the default).
CIRCULAR
Set this keyword for a circular or elliptical projection.
CURRENT
Set this keyword to use the current projection index and return that index in
Iproj.
CYLINDRICAL
Set this keyword for a cylindrical or pseudo-cylindrical projection.
LL_LIMITS
The geocoordinate rectangle of the current map in degrees (Lonmin, Latmin,
Lonmax, Latmax). This range may not always be available, especially if the
LIMIT keyword was not specified in the call to MAP_SET. If either or both the
longitude and latitude range are not available, the minimum and maximum values
will be set to zero.
NAME
Set this keyword to the name of the projection.
PROJ_NAMES
Set this keyword to a string array containing the names of the available
projections, ordered by their indices. The first projection name is stored in
element one.
UVRANGE
The UV coordinate limits of the selected map projection (umin, vmin, umax,
vmax). UV coordinates are mapped to normalized coordinates using the system
variables !X.S and !Y.S. These limits are dependent upon the selected
projection, but independent of the current map.
UV_LIMITS
The UV bounding box of the current map (Umin, Vmin, Umax, Vmax).
--
David Fanning, Ph.D.
Fanning Software Consulting
Phone: 970-221-0438 E-Mail: davidf@dfanning.com
Coyote's Guide to IDL Progamming: http://www.dfanning.com/
Toll-Free IDL Book Orders: 1-888-461-0155
[Note: This follow-up was e-mailed to the cited author.]
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