[geos-devel] supporting filters

[Mateusz Loskot]

Kralidis,Tom [Burlington] wrote:
>> Tom,
>>
>> I'm also interested in some info about internals of DWithin 
>> and Beyond operations.
>> These both operations are supported by FDO 
>> (http://fdo.osgeo.org) but unfortunately I've not found much 
>> information about their specification.
> 
> True.  The only info I found was from FES 1.0.0, section 8.2:
> 
> "The spatial operators DWithin and Beyond test whether the value of a
> geometric property is within or beyond a specified distance of the
> specified literal geometric value."
> 
> So both DWithin and Beyond take as inputs a geometry and distance value.

Right.

But I'd like to get more details, some math declarations or geometries
examples.
I asked on the FDO list about them:

http://lists.osgeo.org/pipermail/fdo-internals/2007-May/001072.html

Cheers
-- 
Mateusz Loskot
http://mateusz.loskot.net