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CONTOUR problem [message #7115]

Tue, 01 October 1996 00:00

Reginald Tang
Messages: 1
Registered: October 1996

Junior Member

Hello,

I would appreciate helpful suggestions to a problem i've been having
with plotting contour lines in IDL.

I am plotting over a stereographic projection of the Northern hemisphere
centered on the North Pole and I am getting a weird "jump" of all levels
of the contour lines towards the pole around latitude -10 degrees. My
plot looks a bit like a pie-chart with a 10-degree slice taken out of
it. Otherwise, the plot is perfectly acceptable (as compared with output
using DISPLAA). I use the following statement:

CONTOUR, H, LON, LAT

where H is height data to be contoured and is a 36x16 array and LON is a
36-vector containing the longitude lines going from 0 to 180 and -170 to
-10. LAT is a 16-vector going from 90 (North pole) to 0 (Equator).

There are only 455 data points to be plotted, and their positions are
concentric and regularly spaced wrt longitude and latitude. however,
data from latitude 90 to 66 are spaced 20 degrees apart in longitude, as
opposed to 10 at lower latitudes than 66.

I've tried giving H, LON and LAT as three arrays of the same dimensions
to CONTOUR (an alternative suggested in the Reference) but this
inexplicably gave me a chaotic mess. A colleague and I have checked and
double-checked the contents of the parameters to make sure they are OK.

Any help, hints or clarifying questions will be appreciated. I hope it's
not a bug in IDL but just something i overlooked!

Reg
------------------
Environment Canada
4905 Dufferin
Downsview, Ontario
M3H 5T4
(416)739-4711

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[Message index]

		CONTOUR problem By: Reginald Tang on Tue, 01 October 1996 00:00
		Re: Contour Problem By: btt on Mon, 26 April 2004 06:22
		Re: Contour Problem By: Christopher Lee on Sat, 24 April 2004 04:39
		Re: Contour Problem By: Jeff Patrick on Mon, 26 April 2004 09:04
		Re: Contour Problem By: James Kuyper on Mon, 26 April 2004 11:14
		Re: CONTOUR problem By: xiao zhang on Wed, 27 August 2008 07:09
		Re: CONTOUR problem By: David Fanning on Wed, 27 August 2008 07:14
		Re: CONTOUR problem By: xiao zhang on Wed, 27 August 2008 07:02
		Re: CONTOUR problem By: David Fanning on Wed, 27 August 2008 07:13
		Re: CONTOUR problem By: Wox on Wed, 27 August 2008 01:06
		Re: CONTOUR problem By: xiao zhang on Wed, 27 August 2008 08:02
		Re: CONTOUR problem By: Wox on Wed, 27 August 2008 08:00
		Re: CONTOUR problem By: David Fanning on Wed, 27 August 2008 07:51
		Re: CONTOUR problem By: xiao zhang on Wed, 27 August 2008 07:41
		Re: CONTOUR problem By: xiao zhang on Wed, 27 August 2008 07:16
		Re: Contour Problem By: David Fanning on Mon, 25 July 2011 11:13

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