| Re: Question: Graphing Radar? [message #34442] |
Sun, 16 March 2003 15:41 |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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Karl Schulze (kschulze@ariel.tamu.edu) writes:
> I am wondering if IDL allows one to plot radar data. Basically, it is just
> a simple polar type of graph...HOWEVER...each point to be graphed needs to
> have a width of one degree. In other words, the size of the point expands
> radially outwards with a width of one degree.
>
> Is there a way to do this on IDL?
Yes, you can plot radar data in IDL. Unfortunately, it is
not as straightforward as RADAR_PLOT. :-)
My experience is with NEXRAD radar, but typically you have
to convert the polar radar data into rectangular coordinates
with CONVERT_COORD, and then do some re-griding to get things
right (I used TRIANGULATE and TRIGRID). Finally, I remember
having to fool around for quite a long time to get the
rotations exactly right so that north was north on a map.
The NEXRAD folks are not real big on documentation. :-)
Here is an example of the NEXRAD radar data plotted on a
map:
ftp://ftp.dfanning.com/pub/dfanning/outgoing/misc/nexrad_rad ar.jpg
Cheers,
David
--
David W. Fanning, Ph.D.
Fanning Software Consulting, Inc.
Phone: 970-221-0438, E-mail: david@dfanning.com
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Toll-Free IDL Book Orders: 1-888-461-0155
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