[geos-devel] [GEOS] #896: Many (all?) GEOS operations do not preserve SRID

GEOS geos-trac at osgeo.org
Fri Jul 6 13:56:58 PDT 2018

#896: Many (all?) GEOS operations do not preserve SRID
 Reporter:  dbaston     |       Owner:  geos-devel@…
     Type:  defect      |      Status:  new
 Priority:  major       |   Milestone:  3.7.0
Component:  Default     |     Version:  3.6.2
 Severity:  Unassigned  |  Resolution:
 Keywords:              |

Comment (by dbaston):

 It looks like the problem is unique to the C API, and affects all
 functions that produce a geometry as an output.

 When a GEOS Geometry is created, it is given the SRID of its
 GeometryFactory. However, the C API does not use the concept of a
 GeometryFactory and provides no access to it. When the C API function
 GEOSSetSRID is called, it sets the SRID of an individual geometry, but
 leaves the GeometryFactory untouched.

 Any objections to resolving this at the C API level, by setting the SRID
 of created geometries to match their inputs?

Ticket URL: <https://trac.osgeo.org/geos/ticket/896#comment:4>
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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