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Re: how to composite a mapcoord object using geographic coordinate(no projection) [message #87713 is a reply to message #87712]

Tue, 25 February 2014 05:26

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Yngvar Larsen writes:

> These files are indeed TIFF 6.0 conformant, but the information in them do not contain enough GeoTIFF tags to have a uniquely defined grid without external information. Thus, you need ugly special cases in your GeoTIFF reader to handle this. Or a specific reader for each. I did the latter for SRTM tiles, which only contain "ModelPixelScaleTag" and "ModelTiepointTag", but no info on the coordinate system.

Thanks for such a detailed explanation. Very helpful.

Cheers,

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

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[Message index]

		Re: how to composite a mapcoord object using geographic coordinate(no projection) By: Jie Zhou on Sat, 22 February 2014 09:14
		Re: how to composite a mapcoord object using geographic coordinate(no projection) By: David Fanning on Sun, 23 February 2014 05:02
		Re: how to composite a mapcoord object using geographic coordinate(no projection) By: Yngvar Larsen on Sun, 23 February 2014 08:12
		Re: how to composite a mapcoord object using geographic coordinate(no projection) By: David Fanning on Sun, 23 February 2014 16:22
		Re: how to composite a mapcoord object using geographic coordinate(no projection) By: Jie Zhou on Mon, 24 February 2014 00:19
		Re: how to composite a mapcoord object using geographic coordinate(no projection) By: David Fanning on Mon, 24 February 2014 05:37
		Re: how to composite a mapcoord object using geographic coordinate(no projection) By: Yngvar Larsen on Mon, 24 February 2014 00:47
		Re: how to composite a mapcoord object using geographic coordinate(no projection) By: David Fanning on Mon, 24 February 2014 05:38
		Re: how to composite a mapcoord object using geographic coordinate(no projection) By: David Fanning on Mon, 24 February 2014 05:58
		Re: how to composite a mapcoord object using geographic coordinate(no projection) By: Fabzi on Mon, 24 February 2014 15:20
		Re: how to composite a mapcoord object using geographic coordinate(no projection) By: David Fanning on Mon, 24 February 2014 15:48
		Re: how to composite a mapcoord object using geographic coordinate(no projection) By: Yngvar Larsen on Tue, 25 February 2014 01:25
		Re: how to composite a mapcoord object using geographic coordinate(no projection) By: David Fanning on Tue, 25 February 2014 05:26
		Re: how to composite a mapcoord object using geographic coordinate(no projection) By: Jie Zhou on Wed, 26 February 2014 00:39
		Re: how to composite a mapcoord object using geographic coordinate(no projection) By: David Fanning on Wed, 26 February 2014 05:21

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