[geos-devel] RE: [GEOS] #468: Geometry breaks valid() and buffer(): "Assertion failed: (0), function query, file AbstractSTRtree.cpp, line 286"

[Martin Davis]

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-trac at 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).
>
>
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