Oracle Spatial Concavehull Function Does Not Work Return The Expected Result

(Doc ID 1418788.1)

Last updated on FEBRUARY 08, 2017

Applies to:

Oracle Spatial - Version: 11.2.0.2 and later   [Release: 11.2 and later ]
Information in this document applies to any platform.

Symptoms


The result of the SDO_GEOM.SDO_CONCAVEHULL between two polygons is a polygon with a shape not expected.

For example, considering these two geometries

the statement

SELECT SDO_GEOM.SDO_CONCAVEHULL( (SELECT SDO_AGGR_UNION(DSYS.SDOAGGRTYPE(A.GEOLOC, 0.005)) FROM TEST_YAPI_FOR_TAR A) , 0.005 ) FROM DUAL;

returns the following geometry

Cause

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