Oracle Spatial User's Guide and Reference - InfoLab

Spatial Java Interface
tolerance NUMBER);
The tolerance value in the SDOAGGRTYPE definition should be the same as the
SDO_TOLERANCE value specified in the DIMINFO column in the xxx_SDO_
GEOM_METADATA views for the geometries, unless you have a specific reason for
wanting a different value. For more information about tolerance, see Section 1.5.5;
for information about the xxx_SDO_GEOM_METADATA views, see Section 2.4.
The tolerance value in the SDOAGGRTYPE definition can affect the result of a
spatial aggregate function. Figure 1–8 shows a spatial aggregate union (SDO_
AGGR_UNION) operation of two geometries using two different tolerance values:
one smaller and one larger than the distance between the geometries.
Figure 1–8 Tolerance in an Aggregate Union Operation
In the first aggregate union operation in Figure 1–8, where the tolerance is less than
the distance between the rectangles, the result is a compound geometry consisting
of two rectangles. In the second aggregate union operation, where the tolerance is
greater than the distance between the rectangles, the result is a single geometry.
1.11 Spatial Java Interface
This section describes the sdoapi Java client interface for general Spatial
operations. In addition to the sdoapi interface, Spatial provides other specialized
interfaces, which are documented in other manuals:
1-20 Oracle Spatial User’s Guide and Reference
Note: Do not use SDOAGGRTYPE as the data type for a column
in a table. Use this type only in calls to spatial aggregate functions.
geom1
tolerance
tolerance
geom2
geom1 geom2
SDO_AGGR_
UNION
SDO_AGGR_
UNION