#859: Voronoi issue
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Reporter: jjgreen | Owner: geos-devel@…
Type: defect | Status: new
Priority: major | Milestone: 3.5.2
Component: Default | Version: 3.5.1
Severity: Unassigned | Keywords:
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OSGEO Voronoi issue
Further to a posting on the PostGIS mailing list
in February 2018, this directory contains scripts
to generate data for the bug report for OSGEO.
The scripts generating the data can only be used
against a copy of the seadb DB which is not open
source, but the `reproduce.sh` script can be used
(with minimal modifications) to reproduce the issue
with the CSV file output from the DB.
For my setup, which is Ubuntu Xenial with PostGIS
from apt-postgresql.org and
- POSTGIS="2.3.3 r15473"
- GEOS="3.5.0-CAPI-1.9.0 r4084"
- PROJ="Rel. 4.9.2, 08 September 2015"
- GDAL="GDAL 1.11.3, released 2015/09/16"
- LIBXML="2.9.3"
- LIBJSON="0.11.99" RASTER
the `reproduce.sh` script reports
CREATE TABLE
COPY 1322
CREATE INDEX
ERROR: GEOSVoronoiDiagram: TopologyException: Input
geom 1 is invalid: Self-intersection at or near point
444332.38647522771 8548816.0569835864 at
444332.38647522771 8548816.0569835864
As discussed in the PostGIS forum thread mentioned above, we
find that `ST_SnapToGrid` with dyadic grid step fixes the
issue.
The original data for these points was the EuroROSE project,
an EU-funded experiment on the feasibility of the use of
HF-radar for measuring ocean waves, currents and so on. The
experiment took place at Fedje, Norway in early 2000. More
details can be found at
http://wera.cen.uni-hamburg.de/EuroROSE/EuroROSE_Intro.shtml
--
Ticket URL: <https://trac.osgeo.org/geos/ticket/859>
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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