Thank you Mr. Davis for your attention, I tried your suggestion of buffering elements individually then merging the buffers. I buffered several elements without issue, then got the same program stopping error message as before. On the plus side, I did isolate a polygon that was crashing things. Attached is the wkt and wkb of that polygon.
--Christopher On Thu, Aug 18, 2011 at 8:53 PM, Martin Davis <mtncl...@telus.net> wrote: > Incidentally, this is one of those cases where buffering by unioning the > buffers of the components far outperforms the straight buffer (for distance > = 100, 10 s vs 70 s). > > This is something you might be able to try, if your data model permits it. > Split the geometry into its components, and process them all separately. > This should give better performance, and may avoid the GEOS issues. > > On 8/18/2011 8:43 PM, Martin Davis wrote: > > I have tested this in JTS 1.12, and can confirm that both isValid and buffer > work correctly. The buffer operation does take quite a while and requires a > significant amount of memory. > > So the geometry is fine. There may be some issues with GEOS. > > On 8/18/2011 3:44 PM, Christopher DeMars wrote: > > Since the ticket upload function is limited to 256Kb, I thought I > would try to send an example file via this list. > > Attached is water1.wkb, a multipolygon that fubars GEOS buffer or > valid functions. I can supply water2 and/or either file as wkt. > > Thank you for any help you can offer, > --Christopher > > > ---------- Forwarded message ---------- > From: GEOS <geos-t...@osgeo.org> > Date: Thu, Aug 18, 2011 at 3:08 PM > Subject: [GEOS] #468: Geometry breaks valid() and buffer(): "Assertion > failed: (0), function query, file AbstractSTRtree.cpp, line 286" > To: > > > #468: Geometry breaks valid() and buffer(): "Assertion failed: (0), function > query, file AbstractSTRtree.cpp, line 286" > ------------------------+--------------------------------------------------- > Reporter: chdemars | Owner: strk > Type: defect | Status: new > Priority: major | Milestone: 3.3.1 > Component: Core | Version: 3.3.0 > Severity: Unassigned | Keywords: > ------------------------+--------------------------------------------------- > GEOS is pretty far down in the software stack I'm using, but it looks like > my program stopping error lies there. > > Software being used: > geos-config --version 3.3.0 > I'm using GeoDjango and PostGIS on top of GEOS with development taking > place on Mac OSX > > Geometry source: > original source is: > http://www.water.ca.gov/landwateruse/docs/landusedata/shapes/04bu.zip > > After loading that (and the other DWR land use files) into my > PostGIS/GeoDjango database I extracted all the water features using: > water = DWRlanduse.objects.filter(class1__contains='NW', > survey_area__contains='BUTTE COUNTY').collect() > > I have attached the wkb and wkt output of the above with water1 using > .unionagg() and water2 using .collect() to produce a MultiPolygon and > GeometryCollection respectively. Both produce failure. > > If I try to use .buffer() or .valid() functions on either water1 or water2 > I get the same failure: > Assertion failed: (0), function query, file AbstractSTRtree.cpp, line 286 > which says one of the 'childBoundables' is of an unsupported type. > Functions like area or centroid work fine. > > I would like to know if the error is a problem with GEOS and/or a problem > with the geometry. Regardless of the source of error, I would also like to > know how to go about fixing it. > > Thank you for your time and efforts, > --Christopher > > -- > Ticket URL: <http://trac.osgeo.org/geos/ticket/468> > GEOS <http://geos.refractions.net/> > GEOS (Geometry Engine - Open Source) is a C++ port of the Java > Topology Suite (JTS). > > > _______________________________________________ > geos-devel mailing list > geos-devel@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/geos-devel > > ----- > No virus found in this message. > Checked by AVG - www.avg.com > Version: 10.0.1392 / Virus Database: 1520/3842 - Release Date: 08/18/11 > > > _______________________________________________ > geos-devel mailing list > geos-devel@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/geos-devel > > No virus found in this message. > Checked by AVG - www.avg.com > Version: 10.0.1392 / Virus Database: 1520/3842 - Release Date: 08/18/11 > > _______________________________________________ > geos-devel mailing list > geos-devel@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/geos-devel >
fubargeom.wkb
Description: Binary data
fubargeom.wkt
Description: Binary data
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