CoveredBy
[Spatial Relationships]
OGC Definition
There is none.
Oracle Spatial Definition
[OSUGR] defines CoveredBy as follows. "The opposite of COVERS. A.COVEREDBY B implies B COVERS A."
The FDO Oracle Provider implements this definition:
CoveredBy = coveredby as used in the third argument to the sdo_relate spatial operator, for example,
sdo_relate(a.GEOMETRY, MDSYS.SDO_GEOMETRY(2002, NULL, NULL, MDSYS.SDO_ELEM_INFO_ARRAY(1,2,1), MDSYS.SDO_ORDINATE_ARRAY(4,1, 8,1)), 'mask=coveredby').
PHP Code Implementation
The equivalent of the CoveredBy predicate can be expressed using MgGeometry methods as follows.
<?php
function CoveredBy ($geom1, $geom2) {
$withinBool = $geom1->Within($geom2);
if (!$withinBool) return $withinBool;
$boundary1 = $geom1->Boundary();
$boundary2 = $geom2->Boundary();
$intersectBool = $boundary1->Intersects($boundary2);
return $intersectBool;
}
?>
A Point and MultiPoint cannot be covered because they do not have boundaries.
Illustration
An endpoint of d and an endpoint of e intersect.
