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Re: Map Function Question [message #79865 is a reply to message #79860]

Thu, 19 April 2012 05:35

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

alx writes:

> Well, it seems that the IMAGE function implicitly uses ASPECT_RATIO=1
> and then adjust the position.
> You can get the correct position by forcing ASPECT_RATIO=0 in the
> call.
>
> im = IMAGE(scaledData, x, y, RGB_TABLE=rgb, XRANGE=xrange,
> YRANGE=yrange, GRID_UNITS='degrees', POSITION=[0.1,0.1,0.9,0.9])
> print,im.convertCoord(x[0],y[0],/DATA,/TO_NORMAL)
> 0.10000000 0.24925925 0.00000000
> im = IMAGE(scaledData, x, y, RGB_TABLE=rgb, ASPECT_RATIO=0,
> XRANGE=xrange, YRANGE=yrange, GRID_UNITS='degrees',
> POSITION=[0.1,0.1,0.9,0.9])
> print,im.convertCoord(x[0],y[0],/DATA,/TO_NORMAL)
> 0.10000000 0.10000000 0.00000000
>
> One more thing being not clearly documented and which cannot be
> guessed !

Well, putting ASPECT_RATIO=0 in the call certainly
changes the aspect ratio to *something*, although
God only knows what it is. It is certainly not to
what I asked for. And, whatever it is, the map
I'm trying to put on top of the image seems
to ignore it, too.

Tell me again how you are using these routines
to do science. It does seem a wonder to me!

Cheers,

David

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

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[Message index]

		Re: Map Function Question By: lecacheux.alain on Thu, 19 April 2012 08:10
		Re: Map Function Question By: David Fanning on Thu, 19 April 2012 07:31
		Re: Map Function Question By: lecacheux.alain on Thu, 19 April 2012 07:16
		Re: Map Function Question By: David Fanning on Thu, 19 April 2012 07:16
		Re: Map Function Question By: David Fanning on Thu, 19 April 2012 07:14
		Re: Map Function Question By: David Fanning on Thu, 19 April 2012 06:58
		Re: Map Function Question By: lecacheux.alain on Thu, 19 April 2012 06:27
		Re: Map Function Question By: David Fanning on Thu, 19 April 2012 05:35
		Re: Map Function Question By: lecacheux.alain on Thu, 19 April 2012 02:34
		Re: Map Function Question By: David Fanning on Wed, 18 April 2012 09:20

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