[postgis-users] Conversion of Lambert72 to WGS84 and vice-versa

[Paragon Corporation]

Guy,

I'm not sure what Geotools uses, but ogr2ogr and PostGIS both use the proj4
library.  So the differences between ogr2ogr and PostGIS there might be how
you are calling them or the data files they are using.  So short answer they
should all be about the same accuracy assuming you are really using the same
projections and all the files needed are in place.

As far as whether geotools is better than proj4, I have no clue though I
assume it depends on what transforms you are trying to do.  

What does your command line statement and calls look like for each?
What kind of discrepancy are you seeing?

Hope that helps,
Regina

-----Original Message-----
From: postgis-users-bounces at postgis.refractions.net
[mailto:postgis-users-bounces at postgis.refractions.net] On Behalf Of Guy
Thomas
Sent: Monday, May 04, 2009 2:15 AM
To: postgis-users at postgis.refractions.net
Subject: [postgis-users] Conversion of Lambert72 to WGS84 and vice-versa

Thanks to all who replied to my questions about the conversion.

In the mean time I have tried 3 methods for converting coordinates:

- Postgis
- The java package Geotools
- The Linux command-line utility ogr2ogr

Unfortunately, I get three different results.

Which of the three tools/utilities/... produces the most reliable results?

-- 
Guy Thomas                                    guy.thomas at fks.be
fks bvba - Formal and Knowledge Systems       http://www.fks.be/
Stationsstraat 108                            Tel:  ++32-(0)11-21 49 11
B-3570 ALKEN                                  Fax:  ++32-(0)11-22 04 19
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