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Re: Overlaying gridded winds on satellite data [message #44806 is a reply to message #44805]

Wed, 20 July 2005 09:53

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Chris writes:

> Thanks for your help...when I run the cursor command...I run it right
> after the imagemap procedure...then after that I run it after the
> windbarb procedure...and when I do that...the result is differing
> latitudes and longitudes of only about .05 degrees. When I use the
> cursor command...this is how I write it.
>
> cursor, long, lat
> print, lat, long
>
> I see you mention something about DOWN and DATA keywords...what exactly
> do they do? Thank you again for all of your support.

The DOWN keyword makes sure you only get DOWN cursor
events, not up or movement events. DATA makes sure your
results are in data coordinates (you hope lat and lon in
this case). I would definitely try this again with DOWN
set. Cursor does DATA coordinates by default.

I just don't see where the error could be. I actually
draw the wind barbs in normalized coordinates, but I
use Convert_Coord to convert from data to normalized
coordinates, and I have never had the least bit of trouble
with that.

Don't know. Sorry. It is a pretty small error, it seems
to me. Are you certain the continental outlines are in the
right place?

Cheers,

David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/

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[Message index]

		Re: Overlaying gridded winds on satellite data By: David Fanning on Wed, 20 July 2005 10:39
		Re: Overlaying gridded winds on satellite data By: Chris[3] on Wed, 20 July 2005 10:03
		Re: Overlaying gridded winds on satellite data By: David Fanning on Wed, 20 July 2005 09:53
		Re: Overlaying gridded winds on satellite data By: Chris[3] on Wed, 20 July 2005 09:33
		Re: Overlaying gridded winds on satellite data By: David Fanning on Wed, 20 July 2005 09:14
		Re: Overlaying gridded winds on satellite data By: Chris[3] on Wed, 20 July 2005 08:47
		Re: Overlaying gridded winds on satellite data By: Chris[3] on Wed, 20 July 2005 08:45
		Re: Overlaying gridded winds on satellite data By: David Fanning on Wed, 20 July 2005 06:08
		Re: Overlaying gridded winds on satellite data By: James Kuyper on Wed, 20 July 2005 05:44
		Re: Overlaying gridded winds on satellite data By: Chris[3] on Wed, 20 July 2005 13:31

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