[geos-devel] [GEOS] #982: Postgis ST_ConcaveHull Runtime GEOS Problem?

GEOS geos-trac at osgeo.org
Sun Aug 25 08:59:45 PDT 2019

#982: Postgis ST_ConcaveHull Runtime GEOS Problem?
 Reporter:  tsw         |       Owner:  geos-devel@…
     Type:  defect      |      Status:  reopened
 Priority:  major       |   Milestone:
Component:  Default     |     Version:  3.7.0
 Severity:  Unassigned  |  Resolution:
 Keywords:              |

Comment (by komzpa):

 @dbaston PostGIS is calling GEOSUnion in natural way as part of higher
 level algorithm.

 Single GEOSUnaryUnion call is working unexpectedly slow. This manifests as
 slow PostGIS. That manifestation is problem of PostGIS. The slowness of
 GEOSUnaryUnion is GEOS problem, will be there whether ST_ConcaveHull is
 rewritten or not, and this ticket has everything to reproduce it.

 If GEOS is not concerned of performance of overlay ops then this ticket
 can be closed together with #867. I hope this is not the case.

Ticket URL: <https://trac.osgeo.org/geos/ticket/982#comment:9>
GEOS <http://trac.osgeo.org/geos>
GEOS (Geometry Engine - Open Source) is a C++ port of the Java Topology Suite (JTS).

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