| Re: map projection and map on XY plane in 3D [message #9724] |
Wed, 06 August 1997 00:00 |
davidf
Messages: 2866
Registered: September 1996
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Senior Member |
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Martin Schultz writes:
> Maybe someone can answer the following 2 questions:
>
> (1) how can I project map continents onto a 3D graph, i.e. the
> continents should be drawn in the XY plane ?
Set up a 3D coordinate space. Use the Map_Set or Map_Continents
command with the T3D keyword set. Like this:
Surfr ; Or some such routine that puts a matrix in !P.T.
Map_Set, /Cylindrical, /Continents, /T3D
If you want to put the continents some place other than flat in
the XY plane the documentation says to use the ZValue keyword.
But I think this is broken. (I seem to recall dimly a workaround
that involved using data coordinates rather than normalized
coordinates, as the documentation suggests, but I don't remember
the details and I don't have time tonight to fool around with it.)
And if you want filled continents, forget that too. Ain't gonna
happen in IDL 4.1 in 3D space. The good news is that both of
these problems are fixed in IDL 5. :-)
> (2) how can I get a simple cylindrical projection that is centered
> around 180 (i.e. the pacific) ? Setting LIMIT=[-60,150,60,240] does
> *not* work !
I tried this. It looks like it is centered on the Pacific to me. ;-)
Map_Set, 0, 180, /Cylindrical, /Continents
Cheers,
David
------------------------------------------------------------ --
David Fanning, Ph.D.
Fanning Software Consulting
Customizable IDL Programming Courses
Phone: 970-221-0438 E-Mail: davidf@dfanning.com
Coyote's Guide to IDL Programming: http://www.dfanning.com
IDL 5 Reports: http://www.dfanning.com/documents/anomaly5.html
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