[fdo-internals] About distance and spatial operations

[Gavin Cramer]

Hi, Mateusz.  CoveredBy and Inside correspond to the same-named Oracle
Spatial SDO operators.  See
http://download-east.oracle.com/docs/cd/B19306_01/appdev.102/b14255/sdo_
intro.htm#i880253 .  Inside selects geometries that are strictly inside
the filter's boundaries.  CoveredBy selects geometries that are both
inside and touching the boundaries (which I find a bit odd).

All of the other SpatialCondition operators are intended to be the same
as the respectively named OGC operators.

As for the DistanceOperations, "Within" should be the same as the
SpatialOperations_Within, except allowing for the offset distance.  See
SDO's SDO_WITHIN_DISTANCE.  "Beyond" is everything else (i.e. Disjoint
from the filter geometry's boundary, plus the offset distance).

Gavin


-----Original Message-----
From: fdo-internals-bounces at lists.osgeo.org
[mailto:fdo-internals-bounces at lists.osgeo.org] On Behalf Of Mateusz
Loskot
Sent: Saturday, May 26, 2007 8:30 PM
To: fdo-internals
Subject: [fdo-internals] About distance and spatial operations

Hi,

Where can I find detailed specification/requirements of following
operations:
FdoDistanceOperations_Within
FdoDistanceOperations_Beyond
FdoSpatialOperations_CoveredBy
FdoSpatialOperations_Inside

I'm also interested in differences between these two last operations
and OGC spatial predicates, ie. what's differences between Within and
FdoSpatialOperations_Inside?

Thanks in advance!
-- 
Mateusz Loskot
http://mateusz.loskot.net
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