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Re: Amazingly accurate UTM <-> Lat/Lon transformations [message #85918 is a reply to message #85915]

Wed, 18 September 2013 06:04

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Tom Grydeland writes:

> So -- the information was intended for those who persist in doing this, even when told that it may not be the best of ideas, and to show them that the transformations _can_ be made in an invertible way, using the expressions from Wikipedia rather than IDL's mapping routines. Furthermore: IDL's routines will happily accept the task of transforming to UTM projections a quarter of a globe away, even if the morality of such action can be questioned. Given that the task
will be performed, I think an accurate result is to be preferred over a wildly inaccurate one. Don't you agree?

I agree that wildly inaccurate results should be avoided. ;-)

I'm not totally convinced the way to avoid them in this case is to roll
your own software. I'd rather see folks fix the problem by using map
projection software correctly. My guess is that both of our efforts will
prove to be for naught for most users. :-)

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]

		Amazingly accurate UTM <-> Lat/Lon transformations By: tom.grydeland on Tue, 17 September 2013 01:50
		Re: Amazingly accurate UTM <-> Lat/Lon transformations By: David Fanning on Tue, 17 September 2013 11:16
		Re: Amazingly accurate UTM <-> Lat/Lon transformations By: Fabzi on Wed, 18 September 2013 02:13
		Re: Amazingly accurate UTM <-> Lat/Lon transformations By: David Fanning on Wed, 18 September 2013 06:19
		Re: Amazingly accurate UTM <-> Lat/Lon transformations By: Andy Sayer on Wed, 18 September 2013 07:20
		Re: Amazingly accurate UTM <-> Lat/Lon transformations By: tom.grydeland on Wed, 18 September 2013 02:15
		Re: Amazingly accurate UTM <-> Lat/Lon transformations By: David Fanning on Wed, 18 September 2013 06:04
		Re: Amazingly accurate UTM <-> Lat/Lon transformations By: tom.grydeland on Thu, 19 September 2013 05:40
		Re: Amazingly accurate UTM <-> Lat/Lon transformations By: David Fanning on Thu, 19 September 2013 05:47

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