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Difference between LL83 and LL-83

H

Hello Everyone,

I have a very simple question regarding Coordinate Systems. I found out there were "LL83" and "LL-83" which looked pretty much same.

Do you guys know what is the major difference between those two systems?

Thank you!

Sean

Best answer by david_r

While in FME Workbench, open Tools / Browse Coordinate Systems. You can then locate both coordinate systems and compare their definitions.

I'm no expert on the matter, but since their OGC/ESRI WKT description is identical I would assume there's no difference between them.

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david_r
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  • david_rCelebrity
  • Best Answer
  • July 21, 2017

While in FME Workbench, open Tools / Browse Coordinate Systems. You can then locate both coordinate systems and compare their definitions.

I'm no expert on the matter, but since their OGC/ESRI WKT description is identical I would assume there's no difference between them.

redgeographics
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david_r wrote:

While in FME Workbench, open Tools / Browse Coordinate Systems. You can then locate both coordinate systems and compare their definitions.

I'm no expert on the matter, but since their OGC/ESRI WKT description is identical I would assume there's no difference between them.

The only difference I can see is that LL83 is limited to a certain geographic area: 

 

MAX_LAT: 88.450000000000003 MAX_LNG: -45.733333333333334 MIN_LAT: 12.933333333333334 MIN_LNG: -194.34999999999999
I.e. "North America".

 

 

LL-83 does not have that limitation so it can be used globally (but it may not be the best option.

 

 

And just to clarify, if you have data that falls outside of that envelope and you want to reproject it to LL83 FME won't actually stop you from doing that, or warn you.
fmelizard
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  • fmelizardSafer
  • Safer
  • July 25, 2017
david_r wrote:

While in FME Workbench, open Tools / Browse Coordinate Systems. You can then locate both coordinate systems and compare their definitions.

I'm no expert on the matter, but since their OGC/ESRI WKT description is identical I would assume there's no difference between them.

Yep, they are the same. They live on only for historical reasons. I think we used to have UTM83-10 and UTM10-83 too. And yep, they were the same.

 

 

In modern times we're *much* more careful. But that said we do sync our definitions with some open source folks and occasionally get names we might not have completely desired.

 

 

Sorry for the ambiguity.

 

 

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