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Re: Subset point data using shape file [message #85069 is a reply to message #85068]

Mon, 01 July 2013 06:13

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Justin Beckers writes:

> Accessing the polygons vertices and bounds has been relatively straightforward, I am just unsure of how to proceed to subset the data using this information. I did subset the tracks using the latitude range of the bounding box, but this still leaves me with points that are outside my shapefile (e.g. for tracks that cut diagonally across near the top left of the bounding box/shape)

You can find an article, with a couple of functions, for finding whether
a point is inside a polygon here:

http://www.idlcoyote.com/tips/point_in_polygon.html

Ronn Kling also has an algorithm that I hear is very good:

http://www.rlkling.com/cool-stuff.htm

Cheers,

David

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

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[Message index]

		Subset point data using shape file By: Justin Beckers on Mon, 01 July 2013 05:58
		Re: Subset point data using shape file By: David Fanning on Mon, 01 July 2013 06:13
		Re: Subset point data using shape file By: Justin Beckers on Wed, 03 July 2013 04:17

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