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Re: coordinates on land [message #18317 is a reply to message #18219]

Wed, 15 December 1999 00:00

wmc
Messages: 117
Registered: February 1995

Senior Member

Mark Hadfield <m.hadfield@niwa.cri.nz> wrote:
> Klaus Scipal <kscipal@ipf.tuwien.ac.at> wrote in message
> news:82p4ia$bf$1@news.tuwien.ac.at...
>> I am looking for an IDL procedure that tells me if a point (given in
>> longitude and latitude) is situated on land or on water.
>> for example the point 10ï¿½N and 20ï¿½E is situated on land (in Africa) the
>> point 10ï¿½N 40ï¿½W is situated on water (the Atlantic)

If you just want something that works rather than elegance, just use the
standard IDL map routines to draw the globe, and ask it to fill in the
continents. Read the pixel value of your lat lon coords, and you know if
its filled or not, hence land or sea. You can do this in a pixmap to
avoid distrubing the screen.

-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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		coordinates on land By: Klaus Scipal on Thu, 09 December 1999 00:00
		Re: coordinates on land By: wmc on Wed, 15 December 1999 00:00

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