| Re: Filled Contour Colors on Maps Incorrect [message #26800 is a reply to message #26799] |
Wed, 26 September 2001 08:27   |
Martin Downing
Messages: 136
Registered: September 1998
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Senior Member |
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Ok your right enough, its not a bug! Inspired by Reimar's excellent example
of actually reading the manual, I noted that under the CELL_FILL section of
the CONTOUR routine it states:
"Tip - In order for CONTOUR to fill the contours properly when using a map
projection, the X and Y arrays (if supplied) must be arranged in increasing
order. This ensures that the polygons generated will be in counter clockwise
order, as required by the mapping graphics pipeline."
Sure enough David's data had the Y data (LATS) in decreasing order. So all
we need to do to fix David's puzzle is reverse the Y data before the plot
routines:
lats = reverse(lats)
data = reverse(data, 2)
The example then works fine (and actually gives yet another different result
if you just replace /FILL with /CELL_FILL)!
Cheers
Martin
Funny that RSI considers information that would have prevented this whole
diversion a *tip* :)
--
----------------------------------------
Martin Downing,
Clinical Research Physicist,
Orthopaedic RSA Research Centre,
Woodend Hospital, Aberdeen, AB15 6LS.
Tel. 01224 556055 / 07903901612
Fax. 01224 556662
m.downing@abdn.ac.uk
"David Fanning" <david@dfanning.com> wrote in message
news:MPG.161b9484d4bf047b9896cb@news.frii.com...
> Reimar Bauer (r.bauer@fz-juelich.de) writes:
>
>> You should use /CELL_FILL instead of /FILL with maps.
>
> Oh, right. Well, there you go! I learn something
> new nearly every day with IDL. :-)
>
> Thanks, Reimar.
>
> Cheers,
>
> David
>
> --
> David W. Fanning, Ph.D.
> Fanning Software Consulting
> 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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