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Re: subset an image by roi in idl [message #50468 is a reply to message #50330]

Fri, 29 September 2006 10:34

Jean H.
Messages: 472
Registered: July 2006

Senior Member

> ;Prepare the subset dimensions
> dims[0]=-1L
> dims[1]=min(xf)-1
> dims[2]=max(xf)-1
> dims[3]=min(yf)-1
> dims[4]=max(yf)-1

Do not do the -1 here.
Envi_convert_file_coordinates already returns the pixel locations
starting at 0 and therefore doing -1 induces a shift of 1 pixel in the
subseted image.

This method only returns rectangular subset. You might want to mask the
pixels outside of your polygon.

Jean H.

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[Message index]

		subset an image by roi in idl By: gis_learner on Mon, 25 September 2006 07:55
		Re: subset an image by roi in idl By: peter.eddy@shaw.ca on Tue, 03 October 2006 08:00
		Re: subset an image by roi in idl By: Jean H. on Fri, 29 September 2006 10:34
		Re: subset an image by roi in idl By: peter.eddy@shaw.ca on Fri, 29 September 2006 08:45

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