Hello Charles :)
[EMAIL PROTECTED] a écrit :
> Recently New Caledonia has updated its official coordinate reference
> system, just updated by the EPSG in the early of August.
>
> This CRS is unavoidable for my country, is it possible and easy for
> someone to support it in all the necessary Geootols libs. It is the 3163
> EPSG code "RGNC91-93 / Lambert New Caledonia".
It depends which gt2-epsg-???.jar factory you use.
1) If you use gt2-epsg-access (why implies that an Access database version 6.11
is installed and
registered as an ODBC datasource under "EPSG" name), you already have it. You
can test using the
following (chdir in a directory containing all Geotools JARs). I tested it and
it work on my machine.
java -ea -cp gt2-epsg-access-2.3-SNAPSHOT.jar
org.geotools.referencing.factory.epsg.DefaultFactory 3163
2) If you use gt2-epsg-hsql (which is bundled with a copy of the EPSG database,
so users don't have
to install it), then it is not yet available because gt2-epsg-hsql still
contains the EPSG database
version 6.8. I have not yet upgrated it to version 6.11. The upgrate should be
approximatively one
or two hours work. I just need to take the time to do it (or find a volunter
for that):
java -ea -cp gt2-epsg-hsql-2.3-SNAPSHOT.jar
org.geotools.referencing.factory.epsg.DefaultFactory 3163
3) If you use gt2-epsg-wkt, then the issue is more tricky. This plugin contains
only a subset of the
EPSG database (approximatively half of all EPSG's CRS), and I'm not sure that
it is going to evolve
much. The best thing may be to update it yourself: unzip the JAR file, find the
epsg.properties file
and open it in an editor, and add the following line:
3163=
PROJCS["RGNC91-93 / Lambert New Caledonia",
GEOGCS["RGNC91-93",
DATUM["Reseau Geodesique de Nouvelle Caledonie 91-93",
SPHEROID["GRS 1980", 6378137.0, 298.257222101, AUTHORITY["EPSG","7019"]],
TOWGS84[0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0],
AUTHORITY["EPSG","6749"]],
PRIMEM["Greenwich", 0.0, AUTHORITY["EPSG","8901"]],
UNIT["degree", 0.017453292519943295],
AXIS["Geodetic latitude", NORTH],
AXIS["Geodetic longitude", EAST],
AUTHORITY["EPSG","4749"]],
PROJECTION["Lambert Conic Conformal (2SP)", AUTHORITY["EPSG","9802"]],
PARAMETER["central_meridian", 166.0],
PARAMETER["latitude_of_origin", -21.5],
PARAMETER["standard_parallel_1", -20.666666666666668],
PARAMETER["false_easting", 400000.0],
PARAMETER["false_northing", 300000.0],
PARAMETER["standard_parallel_2", -22.333333333333332],
UNIT["m", 1.0],
AXIS["Easting", EAST],
AXIS["Northing", NORTH],
AUTHORITY["EPSG","3163"]]
You will have to put everything on a single line. I posted it as an indented
WKT in this email for
readability. Be carefull about axis order. The above WKT use
(latitude,longitude) - you may need to
swap the two "AXIS[...]" lines in order to force (longitude,latitude) axis
order if you plan to use
this CRS with GeoServer. You can also just ommit all AXIS lines; the default is
(longitude,latitude)
or (x,y). I believe that all other lines in the epsg.properties file just ommit
the AXIS infos.
For reference, more on axis order issue here:
http://docs.codehaus.org/display/GEOTOOLS/The+axis+order+issue
The future
----------
As far as I know, current Geoserver and uDig releases avoid epsg-hsql and use
epsg-wkt instead
because of the above-cited axis order issue. We would like to abandon completly
epsg-wkt and get
Geoserver / uDig to work on epsg-hsql or epsg-access instead. One benefit is
that you would get the
CRS for your country (assuming that we updated epsg-hsql, or you use
epsg-access or
epsg-postgresql). However we still have some issues to resolve before we get
there. Those issues are
tracked there:
http://jira.codehaus.org/browse/GEOT-364
Martin
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