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Re: Need help with map projection conversion in ENVI [message #74584 is a reply to message #74520]

Tue, 25 January 2011 04:46

wita
Messages: 43
Registered: January 2005

Member

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

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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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