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Re: Display radar data? [message #62858]

Thu, 09 October 2008 00:40

Dave[4]
Messages: 38
Registered: December 2007

Member

On Oct 8, 10:32 pm, David Fanning <n...@dfanning.com> wrote:
> Dave writes:
>> I have some weather radar data, whose coordinates are distances
>> (kilometers) and angles to the radar station. So how can I convert
>> these local coordinates to longitude/latitude cordinates? Please give
>> any clue.
>
> Set up a map projection of the area of interest with MAP_SET
> or MAP_PROJ_INIT. Then use CV_COORD to convert your data
> from polar coordinates to rectangular coordinates (which
> will be the data or lat/lon coordinates, in this case).
>
> 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.")

Fanning, very thanks for your reply. Your answer is simple, but not
suit for my problem.
As Ciao says, high-precision is very important for radar data. Many
things should be considered, such like earth radius,
altitude of radar station and so on. Things going complex.
I find SPRINT code at http://www.mmm.ucar.edu/pdas/pdas.html, which is
a program to interpolate radar measurements taken at spherical
coordinates (range, azimuth, and elevation) to regularly-spaced
Cartesian or longitude-latitude grids. May be I should try it. Thanks
again.

DAVE

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[Message index]

		Re: Display radar data? By: Dave[4] on Thu, 09 October 2008 00:40
		Re: Display radar data? By: Kenneth P. Bowman on Wed, 08 October 2008 07:59
		Re: Display radar data? By: Kenneth P. Bowman on Wed, 08 October 2008 06:41
		Re: Display radar data? By: David Fanning on Wed, 08 October 2008 08:35
		Re: Display radar data? By: pgrigis on Wed, 08 October 2008 08:33
		Re: Display radar data? By: pgrigis on Wed, 08 October 2008 08:13
		Re: Display radar data? By: David Fanning on Wed, 08 October 2008 07:32

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