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Re: Velocity vectors on maps [message #17359 is a reply to message #17337]

Thu, 07 October 1999 00:00

wmc
Messages: 117
Registered: February 1995

Senior Member

Kenneth P. Bowman <bowman@null.edu> wrote:
> Can anyone give me pointers to IDL procedures to making correct velocity
> vector plots on maps, notably azimuthal polar projections?

This is a code fragment:

fx1=fx*cosd(lo)+fy*sind(lo)
fy1=-fx*sind(lo)+fy*cosd(lo)

which works OK for polar stereo... [fx,fy] are the original arrow sizes,
lo the longitudes at the arrow positions, and [fx1,fy1] the rotated arrows.

-W.

--
William M Connolley | wmc@bas.ac.uk | http://www.nbs.ac.uk/public/icd/wmc/
Climate Modeller, British Antarctic Survey | Disclaimer: I speak for myself

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		Re: Velocity vectors on maps By: m218003 on Fri, 08 October 1999 00:00
		Re: Velocity vectors on maps By: wmc on Thu, 07 October 1999 00:00

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