comp.lang.idl-pvwave archive: archive » contour over a map and 180 degrees off or problems with dateline

Home » Public Forums » archive » contour over a map and 180 degrees off or problems with dateline

Show: Today's Messages :: Show Polls :: Message Navigator
E-mail to friend

contour over a map and 180 degrees off or problems with dateline [message #53740]

Wed, 02 May 2007 10:51

teich
Messages: 33
Registered: May 2007

Member

Hi,

I want to contour data on a map projection and have something like
this:

field=fltarr(72,46)
lon=fltarr(72)
lat=fltarr(46)

My lon arrary is indexed from -177.5 to +177.5. My lat array is
indexed from -89.0, -86.0, ..., +86.0, +89.0.

After mapset (using default map and centered at 0,0), I do
contour,field,lon,lat. What I get is displaced by 180 degrees. If I
change my lon to go from 0.25 to 357.5, then the map looks correct,
but the contours do not connect at the dateline.

Can anyone help with this?

Thanks,

Howie

Report message to a moderator

[Message index]

		contour over a map and 180 degrees off or problems with dateline By: teich on Wed, 02 May 2007 10:51
		Re: contour over a map and 180 degrees off or problems with dateline By: David Fanning on Wed, 02 May 2007 12:51
		Re: contour over a map and 180 degrees off or problems with dateline By: teich on Wed, 02 May 2007 12:48
		Re: contour over a map and 180 degrees off or problems with dateline By: David Fanning on Wed, 02 May 2007 12:32
		Re: contour over a map and 180 degrees off or problems with dateline By: teich on Wed, 02 May 2007 12:20
		Re: contour over a map and 180 degrees off or problems with dateline By: David Fanning on Wed, 02 May 2007 11:52
		Re: contour over a map and 180 degrees off or problems with dateline By: teich on Wed, 02 May 2007 11:41
		Re: contour over a map and 180 degrees off or problems with dateline By: David Fanning on Wed, 02 May 2007 11:07

Previous Topic:	ENVI does a dumb thing reading a TIFF file with a palette included
Next Topic:	crazy contour

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Sat Oct 11 13:17:47 PDT 2025

Total time taken to generate the page: 0.08381 seconds