[postgis-users] Lambert72 to WGS84

[Obe, Regina]

Guy,

You would use the ST_Transform function. I see two Lambert 72 in my
database (31300 and 31370).  I assume one of them is right for you, but
if not -- use http://spatialreference.org to find the right one

SELECT * FROM spatial_ref_sys where srtext ilike  '%Lambert 72%'

WGS 84 has an SRID of 4326 so to transform a table you would do
something like

SELECT ST_Transform(the_geom, 4326)
FROM sometable

If you brought your data in with SRID = -1 or the wrong SRID, then you
would need to do

SELECT ST_Transform(ST_SetSRID(the_geom, 31300), 4326) As the_geom_wgs84
FROM sometable

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: Tuesday, April 28, 2009 8:39 AM
To: postgis-users at postgis.refractions.net
Subject: [postgis-users] Lambert72 to WGS84

1. Which postGis methods do I use for converting Lambert72 coordinates 
to WGS84 coordinates and vice-versa?

2. Does anybody know of a Java library that implements this conversion 
or which I can use to implement it?

-- 
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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