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Re: Understanding IDLanROI [message #73004 is a reply to message #72911]

Tue, 19 October 2010 10:38

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

kBob writes:

> To answer my own question ...
>
> Yes, IDLanROI is NOT the IDL routine to perform this check.
>
> After pondering on this for a couple of weeks, I figure what I needed
> to do.
>
> IDLgrROI is the prefer IDL routine to use.
>
> It is a tessellation thing, especially when dealing with State and
> Country Shapefiles that may contain gaps. You may get away with very
> simple polygons using IDLanROI when dealing with a handful of
> vertices, but IDLgrROI and IDLgrROIGroup are the routines you should
> be using along with incorporating IDLgrTessellator in the code.

Can you elaborate a bit on why this "is a tessellation thing"?
I don't really understand what that means. And, supposing
I did understand what it means, what would it have to do
with choosing IDLgrROI over IDLanROI. Isn't IDLgrROI a
subclass of IDLanROI?

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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[Message index]

		Understanding IDLanROI By: KRDean on Fri, 08 October 2010 14:13
		Re: Understanding IDLanROI By: KRDean on Tue, 19 October 2010 08:02
		Re: Understanding IDLanROI By: David Fanning on Tue, 19 October 2010 10:38
		Re: Understanding IDLanROI By: guillermo.castilla.ca on Wed, 20 October 2010 10:01
		Re: Understanding IDLanROI By: KRDean on Fri, 22 October 2010 07:16
		Re: Understanding IDLanROI By: Matt[2] on Mon, 25 October 2010 09:17
		Re: Understanding IDLanROI By: guillermo.castilla.ca on Wed, 27 October 2010 08:44
		Re: Understanding IDLanROI By: guillermo.castilla.ca on Mon, 01 November 2010 06:23
		Re: Understanding IDLanROI By: guillermo.castilla.ca on Mon, 01 November 2010 06:24
		Re: Understanding IDLanROI By: David Fanning on Tue, 19 October 2010 14:02
		Re: Understanding IDLanROI By: KRDean on Tue, 19 October 2010 13:19

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