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Re: mapcontinents with /hires option failing [message #83318 is a reply to message #83317]

Fri, 22 February 2013 09:51

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Chris Torrence writes:

> It looks like there are a couple of things going on. By default, the MAP() function is assigning the center_longitude of the projection to the center of the map, instead of 0 degrees. I'm not sure if this is correct or not, but regardless, the map_proj_forward is then having trouble clipping the polygon.
>
> I'll look into both issues, but in the meantime, if you specify CENTER_LONGITUDE=0 in your map() call, it should give you a nice looking map.

Yes, I think the problem is that Map_Proj_Init returns incorrect UV
coordinates if the center longitude is anything other than zero. I've
had to correct this myself in my cgMap object because I haven't been
able to get anyone at ExcelisVis to understand what the hell I was going
on about. :-)

Here is the article that describes the problem:

http://www.idlcoyote.com/map_tips/uvrange.php

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]

		Re: mapcontinents with /hires option failing By: PMan on Fri, 22 February 2013 10:00
		Re: mapcontinents with /hires option failing By: David Fanning on Fri, 22 February 2013 09:51
		Re: mapcontinents with /hires option failing By: chris_torrence@NOSPAM on Fri, 22 February 2013 09:37
		Re: mapcontinents with /hires option failing By: David Fanning on Fri, 22 February 2013 07:22
		Re: mapcontinents with /hires option failing By: David Fanning on Fri, 22 February 2013 06:41

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