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Re: Over-PLOT() on MAP()? [message #73921 is a reply to message #73920]

Sat, 11 December 2010 16:55

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Paulo Penteado writes:

> plot() seems to have inherited the same limitation as iplot with
> respect to overplotting on maps:
>
> ttp://groups.google.com/group/comp.lang.idl-pvwave/browse_th read/thread/7dad5b4234801dea
>
> You need to use its map projection to convert the coordinates to
> Cartesian:
>
> m=map('sinusoidal')
> lats=[60.,30.,0.,-60.,-45.,60.]
> lons=[-60.,0.,120.,30.,-60.,-60.]
> xy=map_proj_forward(lons,lats,map_structure=m.map_structure)
> p=plot(xy,/over,color='red')

I'm not sure this is a "limitation" so much as just
a poorly documented feature. I think it is absolutely
correct that the "data space" of a map projection should
be in projected XY coordinates, rather than in lat/lon
space. It is just about the only thing about the new
graphics that actually makes a lot of sense to me. :-)

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]

		Re: Over-PLOT() on MAP()? By: David Fanning on Sat, 11 December 2010 18:22
		Re: Over-PLOT() on MAP()? By: penteado on Sat, 11 December 2010 18:01
		Re: Over-PLOT() on MAP()? By: David Fanning on Sat, 11 December 2010 16:55
		Re: Over-PLOT() on MAP()? By: penteado on Sat, 11 December 2010 13:56
		Re: Over-PLOT() on MAP()? By: Matt Haffner on Mon, 13 December 2010 11:23

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