[geos-devel] supporting filters

[Kralidis,Tom [Burlington]]

Hi,

We're going to use geos to support Filter Encoding 1.0.0:

specification: http://portal.opengeospatial.org/files/?artifact_id=1171

schema: http://schemas.opengis.net/filter/1.0.0/filter.xsd)

...spatial predicate functions in MapServer
(http://trac.osgeo.org/mapserver/ticket/2105).

Since geos supports SFSQL, we know the following are supported by geos:

Equals
Disjoint
Touches
Within
Overlaps
Crosses
Intersects
Contains

Filter 1.0.0 also supports the following spatial predicate functions:

DWithin
Beyond
BBOX

BBOX is easy (and implemented) enough, but how about DWithin and Beyond?
Are these supported in any way from geos?

Any advice is much appreciated.

Thanks

..Tom