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Re: Amazingly accurate UTM <-> Lat/Lon transformations [message #85914 is a reply to message #85909]

Wed, 18 September 2013 02:13

Fabzi
Messages: 305
Registered: July 2010

Senior Member

On 09/17/2013 08:16 PM, David Fanning wrote:
> I agree that IDL's map projection software is probably overdue for an
> update. But, I'm not convinced this is any kind of a deal breaker.

I forwarded Tom's post to my colleagues, because many of them are not
aware of these problems and Tom nicely showed the huge discrepancies
that can occur when using UTM. Having said this, I am also concerned
that even if the LonLat->EastingsNothings->LonLat transforms work better
with Tom's code, it might still not be a good idea to use UTM for large
maps.

Regarding the map projections in IDL, it seems that IDL is far behind
many other GIS softwares (correct me if I'm wrong):
- the panel of "out of the box" projections is small
- there is no datum shift transformation tool (!)
- the accuracy, as shown by Tom, could be higher

I believe this is due to the fact that Exelis wants to sell ENVI to IDL
users in need for more complete/accurate projection engines...

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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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