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Re: IDL projections (MAP_PROJ_IMAGE) and ENVI projections, Select spatial substets of images [message #71201]

Mon, 07 June 2010 05:06

d.poreh
Messages: 406
Registered: October 2007

Senior Member

On Jun 7, 4:59 am, David Fanning <n...@dfanning.com> wrote:
> sh writes:
>> I already saw your example of how to warpe images, but this only shows
>> how to project already projected images. And my image is "raw"
>> lat,lon.
>
> I'm not sure what "raw" means. But these are
> probably just geographic coordinates. This is
> sometimes called a plate carree map projection,
> or--in GCTP parlance--an equirectagular projection.
>
>
>
>> Anyway, at least I found a (very old) program which does and can
>> exactly what I want. Maybe someone could take a look, if the results
>> are correct!? Or where is room for improvement?!
>
> "Correct" in what sense? It is certainly not the
> kind of projected data you can do science with, as
> Liam points out in his notes. It is a "display"
> solution. In this sense, if it "looks good" it is
> probably correct enough.
>
> 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.")

As Liam point out, this routine is not working for high latitudes
(weird) too!!!

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[Message index]

		Re: IDL projections (MAP_PROJ_IMAGE) and ENVI projections, Select spatial substets of images By: d.poreh on Mon, 07 June 2010 05:06
		Re: IDL projections (MAP_PROJ_IMAGE) and ENVI projections, Select spatial substets of images By: David Fanning on Mon, 07 June 2010 04:59
		Re: IDL projections (MAP_PROJ_IMAGE) and ENVI projections, Select spatial substets of images By: sh on Mon, 07 June 2010 01:50
		Re: IDL projections (MAP_PROJ_IMAGE) and ENVI projections, Select spatial substets of images By: David Fanning on Tue, 08 June 2010 06:20
		Re: IDL projections (MAP_PROJ_IMAGE) and ENVI projections, Select spatial substets of images By: sh on Tue, 08 June 2010 06:13

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