| Re: polar contour plot [message #69352 is a reply to message #26116] |
Mon, 04 January 2010 09:49   |
Hassan
Messages: 48
Registered: October 2009
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Member |
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On Dec 30 2009, 2:12 pm, David Fanning <n...@dfanning.com> wrote:
> Hassan writes:
>> I have 3 arrays, a zenith angle array, a azimuth angle array and DN
>> values. each DN is related to specific zenith and azimuth. I need to
>> draw a contour of DNs on polar plot which is a circle as the distance
>> from the center of the circle is zenith and distance from North is
>> azimuth . I assume there should be a .pro file or sth that does this
>> work. I used polar_contour but I think I need to add other commands to
>> get the desired results.
>> any help would be appreciated.
>
> Your assumption that there should be a procedure for this
> is a good one, even if it turns out to be entirely wrong.
> I think thing this is one of those should-be-easy-turns-
> out-to-be-hard situations in IDL. (Normally, things are
> the other way around, thank goodness.)
>
> I would approach this problem by setting up a Lambert
> Equal-Area map projection and drawing my contour plot
> on that, after scaling my data to the appropriate
> lat/lon values. This will mean you will have to do
> your own plot annotation (with PLOTS and XYOUTS,
> typically), but I don't think this will be particularly
> difficult.
>
> 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.")
thanks David for the help. i think i need to work out how i can scale
the zenith and azimuth angles based on lat/long.
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