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Re: CGMAP_GRID: Lattitude lines [message #88203 is a reply to message #88201]

Thu, 27 March 2014 08:20

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Oliver Angelil writes:

>
> Yes I tried that, but it gives me exactly the same image produced when using my original line:
>
> cgMap_Grid, /cgGrid, Map_structure=map, color='white', thick=2
>
> I have emailed you the image so you can see what exactly about the latitude lines I am trying to correct.

cgMap_Grid tries to figure out which latitude and longitude lines are
passing trough the image "scene" by sampling the image at 25 points
around its perimeter. When the lines are at angles, as these are, the
algorithm can become confused about the lat and lon range that it uses
to create default grid lines. In these cases, you pretty much have to
abandon the automatic grid lines and define them specifically yourself.
Pass them into the program with LONS and LATS keywords.

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]

		CGMAP_GRID: Lattitude lines By: Oliver Angelil on Thu, 27 March 2014 05:27
		Re: CGMAP_GRID: Lattitude lines By: Oliver Angelil on Thu, 27 March 2014 05:45
		Re: CGMAP_GRID: Lattitude lines By: David Fanning on Thu, 27 March 2014 06:14
		Re: CGMAP_GRID: Lattitude lines By: Oliver Angelil on Thu, 27 March 2014 06:30
		Re: CGMAP_GRID: Lattitude lines By: Oliver Angelil on Thu, 27 March 2014 06:42
		Re: CGMAP_GRID: Lattitude lines By: David Fanning on Thu, 27 March 2014 06:54
		Re: CGMAP_GRID: Lattitude lines By: Oliver Angelil on Thu, 27 March 2014 07:00
		Re: CGMAP_GRID: Lattitude lines By: David Fanning on Thu, 27 March 2014 07:04
		Re: CGMAP_GRID: Lattitude lines By: Oliver Angelil on Thu, 27 March 2014 07:28
		Re: CGMAP_GRID: Lattitude lines By: David Fanning on Thu, 27 March 2014 07:39
		Re: CGMAP_GRID: Lattitude lines By: Oliver Angelil on Thu, 27 March 2014 07:53
		Re: CGMAP_GRID: Lattitude lines By: David Fanning on Thu, 27 March 2014 08:20

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