Martin Desruisseaux wrote:
Jody Garnett a écrit :
Martin - could epsg-hsql support this format right now? It does
produce a CRS with the ordinates in the correct order ... or does
this break our assumptions about "Authority".
I'm not sure to understand. Does epsg.xml#4326 have axis in the
(EAST,NORTH) axis order instead of the "official" (NORTH,EAST)?
The one that looks like a URI follows the "offical" use. The traditional
AUTHORY one does not.
http://www.opengis.net/gml/srs/epsg.xml#4326
-(NORTH,EAST)
EPSG:4326 aka "SRS AUTHORITY"
-(EAST,NORTH)
Even if the epsg.xml#4326 file does not exists, I guess that it is
defined in some document? Does the document said something about axis
order?
Note that the files does not have to exist - this is simply an URI.
Anyway, to come back on the issue of axis order with epsg-hsql, I
realize that some users will wants (EAST,NORTH) order anyway (no
matter what the EPSG database said), and that some mechanism may be
needed in order to give this control to users. I also suspect that
axis order is not the only issue. EPSG sometime uses some particular
units like gradians instead of degrees. I guess that some users will
want to force usage of degrees for all angular measurements.
One possible approach is to create a wrapper around authority
factories. This is the subject of
http://jira.codehaus.org/browse/GEOT-694
Interesting idea, however the interpritation of
http://www.opengis.net/gml/srs/epsg.xml#4326 is clear and could be
supported right away. It is the traditional use that is illspecified,
and the best fix seems to be define something else clearly.
Evil idea - consider it the "http:" Authority ....
Yes, we can do that. Not sure what the name should be, but I think
that considering a new authority may be a good solution.
Right now I'm a little bit stuck with my attempt to create a release.
I try to create a release with both Maven 1 and Maven 2 (the later
being an experimental release), because I really want transitive
dependencies. Maven 2 work well except for the jjtree and javacc
plugins (required for building module/main) which are giving me a lot
of trouble. Once the release is out, I will look at this axis order
issue.
Okay, thanks for working on the release BTW. It is good to share some
of this work around.
Jody
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