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Re: Shape to raster [message #78138 is a reply to message #78123]

Wed, 26 October 2011 10:02

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Fabzou writes:

> My apologies if this question has been posted before.
>
> I have a polygon vector file from which I know the coordinates within a
> grid (subpixel precision) and I would like to make a mask from this
> information (within the polygon = 1, outside = 0).
>
> The only idea I have to make this would be to use the polyfill command
> and use the produced image as a mask. This would be easy to do, but I am
> worried about the precision I would reach by doing so (I am concerned
> about the line thickness, for example, and all the things that make of
> POLYFILL and DRAW_ROI a plot routine and not a "shape to raster" routine).
>
> Maybe there is an IDL equivalent to the ENVI "Build mask from a ROI" tool?

I wouldn't worry about it. I'd put my polygon
into an IDLanROI object and use the ComputeMask
method to create the mask. I'm pretty sure this
is exactly what ENVI does, or pretty close to it. :-)

Cheers,

David

--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.idlcoyote.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")

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[Message index]

		Re: Shape to raster By: MarioIncandenza on Thu, 27 October 2011 09:55
		Re: Shape to raster By: David Fanning on Thu, 27 October 2011 05:30
		Re: Shape to raster By: Fabzou on Thu, 27 October 2011 02:40
		Re: Shape to raster By: David Fanning on Wed, 26 October 2011 10:02
		Re: Shape to raster By: Fabzou on Mon, 31 October 2011 07:18

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