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Re: GeoTiff- grid [message #58271 is a reply to message #58125]

Tue, 22 January 2008 14:47

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

robinson.inj@gmail.com writes:

> David, I followed your examples but still have problems. In the uv
> space my corners IDL and ENVI aggred
> UpperLeftCoordinate:(-167346.0185E, 3677892.5566N)
> LowerRightCoordinate:(1222128.8184E,2983386.7945N)
> My image has 3000 col x 1500 lin. The pix resolution is 463.3127
> meters.

I get an image resolution of 2999 x 1499 when I take
the corner coordinates, subtract them, and divide
by the pixel resolution. The fact that ENVI and IDL
agree is a good thing, but in all of the GeoTIFF
files I've been working, with doing this arithmetic
gives me the image size exactly. So, that concerns
me.

> However in the lon/lat space i got:
> IDL: UpperLeftCoordinate: (-98.555279E, 45.411655N)
> LowerRightCoordinate: ( -81.568627E,51.346972N)
> ENVI: UpperLeftCoordinate: (-98.09914722E, 33.30501389N)
> LowerRightCoordinate:(-84.82142500E, 27.55810278N)

Unless you are using the *completely* wrong map projection
(how did you determine what this is?), then it looks to me
like you didn't convert the corners you thought you were
converting.

But I would like to see the listgeo output to know
what I am dealing with here.

Cheers,

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

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[Message index]

		Re: GeoTiff- grid By: robinson.inj on Tue, 22 January 2008 14:40
		Re: GeoTiff- grid By: David Fanning on Tue, 22 January 2008 14:23
		Re: GeoTiff- grid By: robinson.inj on Tue, 22 January 2008 14:03
		Re: GeoTiff- grid By: David Fanning on Tue, 22 January 2008 13:12
		Re: GeoTiff- grid By: David Fanning on Mon, 21 January 2008 17:48
		Re: GeoTiff- grid By: robinson.inj on Mon, 21 January 2008 17:03
		Re: GeoTiff- grid By: David Fanning on Mon, 21 January 2008 14:39
		Re: GeoTiff- grid By: David Fanning on Tue, 22 January 2008 14:47

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