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Re: Georeferencing Errors [message #41509 is a reply to message #41507]

Tue, 02 November 2004 12:57

mperrin+news
Messages: 81
Registered: May 2001

Member

Will McCarty <will.mccarty@msfc.nasa.gov> 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

If you really care about that many significant figures, you need to
declare these as doubles, not floats:

IDL> dx = 0.00833333333333333333333333333
IDL> print,dx,format="(F25.21)"
0.008333333767950534821
IDL> dx = 0.00833333333333333333333333333d
IDL> print,dx,format="(F25.21)"
0.008333333333333333218

- Marshall

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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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