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Re: Need help with map projection conversion in ENVI [message #74658 is a reply to message #74584]

Tue, 25 January 2011 13:42

BLesht
Messages: 89
Registered: March 2007

Member

On Jan 25, 6:46 am, Allard de Wit <allard.de...@wur.nl> wrote:
> Dear Barry,
>
> The approach to be used is first to georeference
> the image in its original projection (the Mercator
> projection) which indeed needs the tie point
> (image row/column number with given lat/lon) and
> the pixel size which is in decimal degrees for
> the Mercator projection. The latter means that
> although coordinates between the pixels step with
> equal degrees, the real pixel size (in m2)
> changes with latitude. Also you need to
> associate the Mercator project with your image.
>
> After having georeferenced the image you can
> check for correctness by overlaying the
> coastlines (see "create World boundaries").
> Converting to a geographic project should then be
> easy.
>
> I would have to look into it to see how this should
> be done from the ENVI API, but in general your
> approach seems OK. Anyway,I would first test
> it from within the ENVI interface.
>
> Allard

Thanks, Allard. I will try that (again). I appreciate your
suggestion. Barry

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[Message index]

		Re: Need help with map projection conversion in ENVI By: BLesht on Sun, 23 January 2011 19:22
		Re: Need help with map projection conversion in ENVI By: Robin Wilson on Sun, 23 January 2011 17:08
		Re: Need help with map projection conversion in ENVI By: wita on Tue, 25 January 2011 04:46
		Re: Need help with map projection conversion in ENVI By: BLesht on Tue, 25 January 2011 13:42

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