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Raster to Vector outlines- Classification Image [message #69531]

Sat, 23 January 2010 06:50

robintw
Messages: 37
Registered: March 2009

Member

Hi,

I've got a classification image consisting of various polygons, each of
a different value (integers, from 1 to about 59,000!). I'd like to
display all of the boundaries of these polygons on the image, either in
an EVF file or just as an ROI with pixels for each of the boundaries so
I can overlay it on the image.

I've tried using RTV_DOIT, but that extracts each boundary to a separate
EVF file. I've written a routine to stitch together all these EVF files,
but the creation of 1000 of the EVF files using RTV_DOIT takes quite a
while - and the 59,000 polygons I have is only for a small image!

Does anyone know of any better way to do this? It can be using an ENVI
procedure or a built-in IDL function, or a simple way to write some IDL
code to do this.

Best regards,

Robin Wilson
University of Southampton

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