comp.lang.idl-pvwave archive: archive » Find out which area is covered in a map plot

Home » Public Forums » archive » Find out which area is covered in a map plot

Show: Today's Messages :: Show Polls :: Message Navigator
E-mail to friend

Find out which area is covered in a map plot [message #70089]

Fri, 12 March 2010 07:28

M. Suklitsch
Messages: 12
Registered: August 2008

Junior Member

Hi, everybody!

Once in a while I run into the problem that I want to know which area
is actually displayed in a map projection.

For example, I have a Lambert projection displaying Europe and want to
plot wind barbs (using Coyote's WINDBARB routine) on top of it.
Problem is, the wind data is on a regular grid, which means that at
least in the corners (depending on the projection etc.) wind barbs
outside the map get plotted (see http://martin.suklitsch.at/img/1.1999051700.png
for an example of what I mean).

Therefore my question: is there a way to get the outermost lat/lon
values of the projection? If I had this information I could use
IDLgrROI to obtain the indices within my wind array which are located
within the map, set all others to NaN and plot the barbs as usual....

Any help is appreciated!
Best regards,
Martin

Report message to a moderator

[Message index]

		Find out which area is covered in a map plot By: M. Suklitsch on Fri, 12 March 2010 07:28
		Re: Find out which area is covered in a map plot By: M. Suklitsch on Tue, 16 March 2010 00:55
		Re: Find out which area is covered in a map plot By: David Fanning on Mon, 15 March 2010 05:48
		Re: Find out which area is covered in a map plot By: David Fanning on Mon, 15 March 2010 05:45

Previous Topic:	IDL out of range error
Next Topic:	SIGN function: signof(num or array of num)

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Thu Oct 09 22:49:08 PDT 2025

Total time taken to generate the page: 1.68525 seconds