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Re: MAP_SET vs MAP_PROJ_* [message #41670 is a reply to message #41668]

Wed, 10 November 2004 08:37

Liam Gumley
Messages: 473
Registered: November 1994

Senior Member

Ken Mankoff wrote:
> In a different thread, I mentioned MAP_SET, and David Fanning wrote:
>
>> Well, the MAP_PROJ_*** routines are quite good and can be used with
>> either direct or object graphics. And of course you get a much more
>> complete set of map projections and options when you use them.
>
>
> I hadn't know about the MAP_PROJ_* routines, as I haven't used IDL since
> 5.6 when they were introduced.
>
> I don't need the extra projections, nor the fine-grained detail of the
> major/minor planet axes, etc.
>
> Can anyone recommend one over the other? Is there a speed difference?
>
> Also, this is an educational product, and it would be great for the kids
> to be able to print & make globes out of their maps. Here are some
> possibilities:
> http://www.progonos.com/furuti/MapProj/Normal/ProjPoly/Foldo ut/foldout.html
>
> Has anyone added map projections to the IDL routines and can offer
> advice? I am comfortable modifying the routines, and in the past have
> added magnetically-aligned continents as an option to MAP_CONTINENTS.
>
> Thanks,
>
> -k.

I'd love to see a simple example of how the MAP_PROJ routines may be
used with direct graphics. The object graphics example in the IDL
documentation is beyond me...

For example, how do do you define a Lambert Azimuthal Equal Area
Projection in direct graphics centered at a given lat/lon with a
specified resolution, such as 1000 meters per pixel?

Cheers,
Liam.
Practical IDL Programming
http://www.gumley.com/

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[Message index]

		Re: MAP_SET vs MAP_PROJ_* By: JD Smith on Mon, 15 November 2004 11:01
		Re: MAP_SET vs MAP_PROJ_* By: btt on Mon, 15 November 2004 09:11
		Re: MAP_SET vs MAP_PROJ_* By: James Kuyper on Wed, 10 November 2004 20:04
		Re: MAP_SET vs MAP_PROJ_* By: Liam Gumley on Wed, 10 November 2004 13:20
		Re: MAP_SET vs MAP_PROJ_* By: James Kuyper on Wed, 10 November 2004 10:05
		Re: MAP_SET vs MAP_PROJ_* By: Liam Gumley on Wed, 10 November 2004 08:37
		Re: MAP_SET vs MAP_PROJ_* By: Gadhavi on Tue, 08 February 2005 08:29

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