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Re: map_set question [message #17272 is a reply to message #6517]

Thu, 16 September 1999 00:00

Harald Frey
Messages: 41
Registered: March 1997

Member

Colin Peterson wrote:

> If anyone still has the IDL 4.0 User's Guide (1995) please look at
> page 19-10 to help in answering my question here. The picture for the
> Oblique Cylindrical Equidistant map projection interests me because I
> would like to see both poles. I'm using IDL 5.2 on UNIX so that might
> make a difference, but if I type the command on page 19-11:
>
> map_set, 0, 0, 45, LONDEL = 20, LATDEL = 20, $
> /GRID, /CONTINENT, /CYL, TITLE='...'
>
> to produce this map, it comes up with a simple cylindrical map, but
> the whole map actually rotates 45 degrees, ie the edges of the map are
> now 45 degrees from their original horizontal and vertical positions.
> I would expect the ROT value of 45 to create the map on page 19-10 as
> the book says, but it does not. Can anyone explain this discrepancy
> in the book, and how I can create that map on page 19-10? Thanks.
>

The best I could come up with on IDL 5.1 was

map_set, 45, 0., 0, LONDEL = 20, LATDEL = 20,/GRID, $

/CONTINENT, /CYL

but one of the pole ends up at the side of the plot.

Even with the limit keyword I could not shift both poles

into the position of figure 19.4.

=========================================================
Harald U. Frey
Space Sciences Lab phone: 510-643-3323
University of California fax: 510-643-2624
Berkeley, CA 94720-7450 email: hfrey@ssl.berkeley.edu

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[Message index]

		map_set question By: gfu on Tue, 09 July 1996 00:00
		Re: Map_Set Question By: gennari on Fri, 21 February 1997 00:00
		Re: Map_Set Question By: gennari on Fri, 21 February 1997 00:00
		Re: Map_Set Question By: davidf on Fri, 21 February 1997 00:00
		Re: Map_Set Question By: Andy Loughe on Mon, 24 February 1997 00:00
		Re: Map_Set Question By: Tim Patterson on Mon, 24 February 1997 00:00
		Re: Map_Set Question By: Andy Loughe on Mon, 24 February 1997 00:00
		Re: map_set question By: Theo Brauers on Thu, 16 September 1999 00:00
		Re: map_set question By: Craig Markwardt on Thu, 16 September 1999 00:00
		Re: map_set question By: Harald Frey on Thu, 16 September 1999 00:00

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