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Re: Confusions with map_image! [message #66866 is a reply to message #66865]

Fri, 12 June 2009 05:37

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

hethomas writes:

> Having spend the last couple of weeks trying to figure this out, I
> gather this isn't an uncommon problem, but hope that someone might be
> able to clarify -
>
> I have taken some global satellite data, and rebinned this into
> 0.25x0.25 degree pixels. Now I want to plot my data as an image for
> display. The data was originally in the format lat, long, data, but I
> formed data into a grid of 1440 x 720 in order to plot.
>
> The issue I am having is that there appears to be so many variables
> regarding the use of MAP_IMAGE, which seem to change my values
> significantly that I am not unsure what the "right" answer is! For
> example, the maxiumum value in my original grid could be 50, yet after
> using MAP_IMAGE this is reduced to say 35. The main factor which
> seems to affect this is the window size - I have set this to
> xsize=1453, ysize=749 in order to have a resulting image size of
> x=1440, y=720, but the values (although close) are still different.
>
> If anyone can shed any light on this I would be really greatful!

I think it is likely that this is completely the wrong
approach. :-)

Why don't you tell us more about the image (where you
got it, etc.) and maybe we can suggest something that
will work.

Cheers,

David

--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")

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[Message index]

		Re: Confusions with map_image! By: hethomas on Fri, 12 June 2009 08:20
		Re: Confusions with map_image! By: David Fanning on Fri, 12 June 2009 08:05
		Re: Confusions with map_image! By: hethomas on Fri, 12 June 2009 07:48
		Re: Confusions with map_image! By: David Fanning on Fri, 12 June 2009 07:32
		Re: Confusions with map_image! By: hethomas on Fri, 12 June 2009 07:02
		Re: Confusions with map_image! By: David Fanning on Fri, 12 June 2009 06:39
		Re: Confusions with map_image! By: hethomas on Fri, 12 June 2009 06:24
		Re: Confusions with map_image! By: David Fanning on Fri, 12 June 2009 05:37
		Re: Confusions with map_image! By: jameskuyper on Fri, 12 June 2009 17:49

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