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Re: Georeferencing Errors [message #41512 is a reply to message #41509]

Tue, 02 November 2004 12:07

K. Bowman
Messages: 330
Registered: May 2000

Senior Member

In article <ce4903f3.0411021020.112e251f@posting.google.com>,
will.mccarty@msfc.nasa.gov (Will McCarty) wrote:

> OK, I've posted on this before, and this time I'm using a bit of a
> more common dataset (GTOPO30 terrain elevation), but getting similar
> geolocation errors. Thus I'm interested in seeing what (if anything)
> you guys can come up with. I use the following code:
>
> --test_lat_lon.pro
> ulx = -99.99583333333334
> uly = 39.99583333333333
> dx = 0.00833333333333
> dy = 0.00833333333333
>
> lat = fltarr(4800,6000)
> lon = lat
> for i = 0, 4799 do begin
> for j = 0, 5999 do begin
> lat[i,j] = uly - dy*j
> lon[i,j] = ulx + dx*i
> endfor
> endfor

I don't have the data set, but you might try

ulx = -99.99583333333334D0
uly = 39.99583333333333D0
dx = 0.00833333333333D0
dy = 0.00833333333333D0

lat = DBLARR(4800,6000)

As it is, you are not getting the precision you think you are.

Or, it might be a pixel corner/center thing.

Ken Bowman

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[Message index]

		Re: Georeferencing Errors By: David Fanning on Tue, 02 November 2004 13:06
		Re: Georeferencing Errors By: mperrin+news on Tue, 02 November 2004 12:57
		Re: Georeferencing Errors By: K. Bowman on Tue, 02 November 2004 12:07
		Re: Georeferencing Errors By: Kelly Dean on Wed, 03 November 2004 21:31

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