On Tue, Oct 4, 2016 at 9:20 AM, Rahkonen Jukka (MML) <
[email protected]> wrote:
> Hi,
>
> I thought that it would be simple find an answer from the internet but it
> was not: How can I tell for CQL_FILTER the SRID of the geometry? Or is it
> just that I can't?
>
I just can't.
>
> All the examples I have seen are without SRID
> DISJOINT(the_geom, POLYGON((-90 40, -90 45, -60 45, -60 40, -90 40)))
>
> https://github.com/geotools/geotools/blob/master/modules/
> library/cql/ECQL.md
>
> Mail thread https://sourceforge.net/p/geoserver/mailman/message/29234799/
> suggests that SRID support has been considered useful and patches welcome.
> Am I right that SRID is not supported for WKT geometries? I can see that
> for BBOX it is supported as an optional argument
> <crs> ::= ... (* default: EPSG:4326. *)
> from http://old.geotools.org/ECQL-Parser-Design_110493908.html#
> ECQLParserDesign-GeometryLiteral
>
> BTW, where is the specification of the CQL language? It is said to belong
> to Web catalog service but I could not find it from the list of
> http://www.opengeospatial.org/standards/cat.
>
It's somewhere in a CSW abstract spec as far as I remember.... yes, section
6.2.2, "OGC_Common catalogue query language".
It's really defined as a BNF, really tight, no examples.
What we are using today is ECQL, which is more general, but still does not
allow to setup the SRID:
http://docs.geoserver.org/latest/en/user/filter/ecql_reference.html
If I had to add SRID support, instead of altering the syntax, I would
create a filter function that mimics the equivalent
postgis one:
http://postgis.net/docs/ST_SetSRID.html
Maybe giving it a signature like setSRS(geom, epsgCode), or something like
that, so that your filter would become:
DISJOINT(the_geom, setSRS(POLYGON((-90 40, -90 45, -60 45, -60 40, -90
40)), 'EPSG:4326'))
Cheers
Andrea
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