| Re: Where can I find a description of the !MAP structure tags? [message #69374] |
Fri, 15 January 2010 06:51 |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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Nicolas writes:
> I actually make use of both the MAP_PROJ*** routines and the Snyder
> book,
> but I wanted to make sure to understand what IDL does and the meaning
> of each tag in the !MAP structure.
Well, mostly what IDL does (at least with the MAP_PROJ_*** routines)
is implement the USGS GCTP map projection routines. These are
quite old now and are showing their age. In our shop we are moving
in the direction of Python for our data visualization needs,
where we can take advantage of proj4 and gdal mapping tools.
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")
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| Re: Where can I find a description of the !MAP structure tags? [message #69375 is a reply to message #69374] |
Fri, 15 January 2010 06:11  |
Nicolas
Messages: 15
Registered: September 2007
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Junior Member |
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Hi David,
I actually make use of both the MAP_PROJ*** routines and the Snyder
book,
but I wanted to make sure to understand what IDL does and the meaning
of each tag in the !MAP structure.
Thank you anyway,
Nicolas
On Jan 14, 3:54 pm, David Fanning <n...@dfanning.com> wrote:
> Nicolas writes:
>> I'm trying to use and adapt IDL mapping module to produce planetary
>> map products.
>> Where can I find a description of the !MAP structure tags?
>> IDL documentation doesn't say a word and I can't find anything
>> anywhere. :'(
>
> I think you are looking in the wrong place. If I were going
> to produce planetary map products, I would be studying the
> MAP_PROJ_**** routines. These will create the map structure
> that you can use for any of your needs without knowing
> anything much about it.
>
> In any case, if you want to know more about it, you
> will have to study Snyder or some other, equally
> technical, book on map projections. Nothing in the
> IDL documentation will help.
>
> Cheers,
>
> David
>
> --
> David Fanning, Ph.D.
> Fanning Software Consulting, Inc.
> Coyote's Guide to IDL Programming:http://www.dfanning.com/
> Sepore ma de ni thui. ("Perhaps thou speakest truth.")
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| Re: Where can I find a description of the !MAP structure tags? [message #69388 is a reply to message #69375] |
Thu, 14 January 2010 06:54 |
David Fanning
Messages: 11724
Registered: August 2001
|
Senior Member |
|
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Nicolas writes:
> I'm trying to use and adapt IDL mapping module to produce planetary
> map products.
> Where can I find a description of the !MAP structure tags?
> IDL documentation doesn't say a word and I can't find anything
> anywhere. :'(
I think you are looking in the wrong place. If I were going
to produce planetary map products, I would be studying the
MAP_PROJ_**** routines. These will create the map structure
that you can use for any of your needs without knowing
anything much about it.
In any case, if you want to know more about it, you
will have to study Snyder or some other, equally
technical, book on map projections. Nothing in the
IDL documentation will help.
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")
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