| Re: IDL5.2: map_proj_info [message #13803 is a reply to message #13801] |
Thu, 10 December 1998 00:00   |
Andy Loughe
Messages: 174
Registered: November 1995
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Senior Member |
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David Fanning wrote:
>
>
> 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.
It sounds like this is an informational routine, but for most
of the keywords listed I am asked to give (or set) a value.
I don't quite understand that.
I could not find help for map_proj_info by viewing the alphabetical
listings. Apparently the routine is embedded within map_set.pro.
I am running IDL 5.2 on a Sun Solaris system.
Thanks for sending the help file. :-)
>
> Calling Sequence
>
> Result = MAP_PROJ_INFO [, iproj]
>
Does this calling sequence work for you?
If so, that would be great-- for an informational
routine could simply pass into "Result" a structure
variable from which "information" is gleaned.
Unfortunately, I don't think map_proj_info works that way.
Please educate me if I am wrong (is that fee-based?).
> 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.
This is unfortunate. In IDL, limits are normally given by
[latmin,lonmin,latmax,lonmax].
It seems like this particular keyword is nearly useless if
I must provide the necessary limits in a call to map_set anyway.
>
> [Note: This follow-up was e-mailed to the cited author.]
Ditto.
--
Andrew F. Loughe | afl@cdc.noaa.gov
University of Colorado, CIRES Box 449 | http://cdc.noaa.gov/~afl
Boulder, CO 80309-0449 | phn:(303)492-0707 fax:(303)497-7013
------------------------------------------------------------ ---------------
"I do not feel obliged to believe that the same God who has endowed us with
sense, reason, and intellect has intended us to forego their use." -Galileo
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