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Re: IDL 5.0 Observations [message #9183 is a reply to message #9092]

Mon, 09 June 1997 00:00

Andy Loughe
Messages: 174
Registered: November 1995

Senior Member

> Example Code: ---------------------------------------------------------
>
> Map_Set, /Grid, /Continent
> TVLCT, 255, 255, 0, 35
> lon=[-81.2500,83.7500, 83.7500,-81.2500]
> lat=[ 28.7500,28.7500, 31.2500,31.2500]
> Polyfill, lon, lat, Color=35, /Data
>
> Known Workarounds or Fixes: -------------------------------------------
>
> None known.
>
> RSI Technical Support Response: ---------------------------------------
>
> Pending.

Hi Lena, this is your old officemate, Andy!
A known workaround would be to include the Greenwich Meridian when
specifying the coordinates of a polygon which crosses longitude=0.
Your example becomes...

Map_Set, /Grid, /Continent
lon=[-81.25, 0.00, 83.75, 83.75, 0.00, -81.25]
lat=[ 28.75, 28.75, 28.75, 31.25, 31.25, 31.25]
Polyfill, lon, lat, Color=35, /Data

This should work for IDL 4 and 5. A similar workaround is needed
when crossing the dateline and using polyfill in version 5.
Thanks for pointing this out! Let's hope it gets fixed.

--
Andrew F. Loughe |
afl@cdc.noaa.gov
University of Colorado, CIRES Box 449 |
http://cdc.noaa.gov/~afl
Boulder, CO 80309-0449 | phn:(303)492-0707
fax:(303)497-7013
------------------------------------------------------------ ---------------
"I do not feel obliged to believe that the same God who has endowed us
with
sense, reason, and intellect has intended us to forego their use."
-Galileo

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[Message index]

		IDL 5.0 observations By: Phil Williams on Tue, 27 May 1997 00:00
		Re: IDL 5.0 observations By: Gilles Ratel on Wed, 04 June 1997 00:00
		Re: IDL 5.0 observations By: Mirko Vukovic on Tue, 03 June 1997 00:00
		Re: IDL 5.0 observations By: davidf on Tue, 03 June 1997 00:00
		Re: IDL 5.0 observations By: Paul R Smith on Tue, 03 June 1997 00:00
		Re: IDL 5.0 observations By: davidf on Tue, 03 June 1997 00:00
		Re: IDL 5.0 observations By: Mirko Vukovic on Mon, 02 June 1997 00:00
		Re: IDL 5.0 observations By: davidf on Fri, 30 May 1997 00:00
		RE: IDL 5.0 Observations By: davidf on Mon, 09 June 1997 00:00
		Re: IDL 5.0 Observations By: Andy Loughe on Mon, 09 June 1997 00:00
		Re: IDL 5.0 observations By: davidf on Sun, 08 June 1997 00:00
		Re: IDL 5.0 observations By: thompson on Fri, 06 June 1997 00:00
		Re: IDL 5.0 observations By: davidf on Thu, 05 June 1997 00:00
		Re: IDL 5.0 observations By: Stein Vidar Hagfors H on Thu, 05 June 1997 00:00

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