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Re: ROI on map [message #50204 is a reply to message #50194]

Mon, 18 September 2006 10:55

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

catwithhat writes:

> Does anyone have a routine that allows you to define a region of
> interest. ROI on a map projection? (direct graphics). For example,I
> would define a map project, overlay a contour plot and then want to
> interactively select region. The routine would return the vertices of
> the perimeter of the polygon.

And the problem is....what!?

This is no different from drawing any other line on
a draw widget. Convert your positions (returned in
DEVICE coordinates) to your map coordinates with
CONVERT_COORD. Just be sure you save your data
coordinate space (!X, !Y, and !MAP) after you
draw your map so you can restore it before you
do the coordinate conversion.

This article might help:

http://www.dfanning.com/widget_tips/line_on_image.html

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: ROI on map By: David Fanning on Tue, 19 September 2006 04:56
		Re: ROI on map By: catwithhat on Mon, 18 September 2006 22:29
		Re: ROI on map By: David Fanning on Mon, 18 September 2006 10:55

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