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Re: Get pixel info from an geotiff ROI (lat long) [message #57599 is a reply to message #57591]

Sun, 16 December 2007 06:19

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

aleks.franca@gmail.com writes:

> I have a problem with georreferenced tiff files. I need to get pixel
> information from a geotiff image. I have the coordinates LAT LONG of a
> ROI. Inside the Region of interest I need to get information about the
> pixels, such as the many of pixels, and their values.
> It seems to be very simple, but I can't find the right function. I've
> tried to use CONTOUR, but it doesn't give pixel values. I've also
> tried POLYFILL, but it just draws the polygons.
> Could somebody please advise me with a function in IDL, so I could
> work on?

POLYFILLV will return all the pixel indices inside your
polygon. But I would really think about putting these
ROIs into IDLanROI objects. That way you get methods that
do just about everything you can think of to do with an
ROI.

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.")

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		Re: Get pixel info from an geotiff ROI (lat long) By: David Fanning on Sun, 16 December 2007 17:36
		Re: Get pixel info from an geotiff ROI (lat long) By: aleks.franca@gmail.co on Sun, 16 December 2007 17:10
		Re: Get pixel info from an geotiff ROI (lat long) By: David Fanning on Sun, 16 December 2007 06:19

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