In mainline GeoNode we use OWSLib to get this information. Apparently the
coder who added this bit didn't realize that in the WMS capabilities
document the SRS's listed are ones that the server can use for display, not
the native projection for the format. Looking into it, I don't think we can
use WMS for this at all - AFAICT there is no standard way to identify the
native projection of a layer via WMS. (Maybe using the CRS associated with
the BoundingBox for the layer would do it.)
Fortunately we have access to the GeoServer REST API so we can just use *{%
layer.resource.projection %}* instead. Indeed, that is what the Worldmap
guys are copying into the Django database in the snippet you posted. Since
we can fix this problem without modifying the database schema I would like
to, modifying the schema would complicate the upgrade process a bit and our
documentation is lacking already.
--
David Winslow
OpenGeo - http://opengeo.org/
On Mon, Aug 22, 2011 at 3:26 AM, [email protected] <
[email protected]> wrote:
> Hi Stefano,
>
> 2011/8/22 Stefano Menegon <[email protected]>:
> > Hi Luca,
> >
> >
> >> for every data, the Native SRS shown is always 32044. Looking at the
> >> code it seems that the problem is in:
> >> {% if layer.metadata.crsOptions %}<p> <strong>{% trans "Native SRS"
> >> %}:</strong> {{ layer.metadata.crsOptions.0|default:_("No SRS
> >> specified.") }} </p>{% endif %}
> >>
> >> layer.metadata.crsOptions is a big list of CRS and
> >> layer.metadata.crsOptions.0 gives EPSG:32044.
> >>
> >> Any idea?
> >> Thx
> >
> > I investigated it a few weeks ago.
> > The param "layer.metadata.crsOptions" is the list of all the CRS
> > supported by geoserver wms.
> > So, it always displays the first of these CRS, not realy the native SRS.
> >
> > You can configure the "Limited SRS list" option (Geoserver - Services
> > - WMS) in order to change the layer.metadata.crsOptions value,
> > however, I do not know how to get the native SRS value.
> >
> > //stefano menegon
> >
>
> I double checked with World Map and the Layer class has got an srs
> attribute:
>
> https://github.com/cga-harvard/cga-worldmap/blob/master/src/GeoNodePy/geonode/maps/models.py#L842
>
> If I am not wrong the value is set here:
>
> https://github.com/cga-harvard/cga-worldmap/blob/master/src/GeoNodePy/geonode/maps/models.py#L1283
>
> Then in the template you have got layer.srs
>
> Ciao
> Luca
>
>
> --
> Luca Casagrande
> twitter: lucacasagrande
>
