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Re: Objects in ENVI ROI files [message #48833 is a reply to message #48822]

Mon, 22 May 2006 09:56

David Streutker
Messages: 34
Registered: June 2005

Member

I don't have a huge amount of experience writing ROI-related code, but
here's how I would go about it. (I'm assuming that you have a ENVI
license as well, as many of these functions are ENVI-only.)

1. If necessary, use ENVI_RESTORE_ROIS to open an ROI file.
2. Use ENVI_GET_ROI_IDS to get the ID of the ROI you're interested in.
3. Use ENVI_GET_ROI to get the indices associated with your ROI.

I'm not sure what your final goal is - this may be all you need. You
can use ARRAY_INDICES to convert the 1-D ROI indices to 2-D image
coordinates and ENVI_CONVERT_FILE_COORDINATES to get the geographic
coordinates.

If you need a true polygon boundary object, you can use QHULL to find
the boundary points (note that this creates a convex hull, which may
not be optimal, depending on the shape of the ROI). You can then
create an IDLgrPolygon or IDLanROI object, if that's what you need.

Hope that at least points you in the right direction. Much of it is
covered in the *ENVI* help files.

-David

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[Message index]

		Re: Objects in ENVI ROI files By: Bradley Wallet on Tue, 23 May 2006 00:57
		Re: Objects in ENVI ROI files By: Bradley Wallet on Tue, 23 May 2006 00:55
		Re: Objects in ENVI ROI files By: David Streutker on Mon, 22 May 2006 09:56

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