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Re: IDL projections (MAP_PROJ_IMAGE) and ENVI projections, Select spatial substets of images [message #71313 is a reply to message #71201]

Tue, 08 June 2010 06:13

sh
Messages: 26
Registered: April 2010

Junior Member

On Jun 7, 2:06 pm, Dave Poreh <d.po...@gmail.com> wrote:
> 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!!!

Finally it works like your example on your webpage David. (http://
www.dfanning.com/map_tips/warpimage.html)

The image was flipped horizontally and I just changed this at TV not
before I'm reprojecting the image!!
Stupid mistake!

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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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