[geos-devel] [GEOS] #980: GEOSBuffer emits invalid buffering a collection

[GEOS]

#980: GEOSBuffer emits invalid buffering a collection
------------------------+--------------------------
 Reporter:  komzpa      |      Owner:  geos-devel@…
     Type:  defect      |     Status:  new
 Priority:  major       |  Milestone:
Component:  Default     |    Version:  3.7.0
 Severity:  Unassigned  |   Keywords:
------------------------+--------------------------
 Follow-up on #978. I replaced Unary Union by Buffer(0), given that all my
 inputs are polygons. I believe on mailing lists Martin mentioned Overlays-
 NG are going to be similar to it, so may be worth checking it.

 PostGIS query for reference:
 {{{
 09:42:59 [gis] >  select w_geom from tmp_osm_population_raw_nowater where
 p_geom &&
 '(-7885150.676182366,5282400.9061096404)'::point::geometry::box2d and not
 ST_IsValid(ST_Buffer(w_geom, 0)) ;
 NOTICE:  00000: Self-intersection at or near point -7885150.676182366
 5282400.9061096404
 LOCATION:  pg_notice, lwgeom_pg.c:265
 NOTICE:  00000: Self-intersection at or near point -7885150.676182366
 5282400.9061096404
 LOCATION:  pg_notice, lwgeom_pg.c:265
 Time: 1229,412 ms (00:01,229)
 }}}

 Input collections are elementwise valid:
 {{{
 09:40:41 [gis] >  select ST_IsValid((ST_Dump(w_geom)).geom) from
 tmp_osm_population_raw_nowater where p_geom &&
 '(-7885150.676182366,5282400.9061096404)'::point::geometry::box2d and not
 ST_IsValid(ST_Buffer(w_geom, 0)) ;
 NOTICE:  00000: Self-intersection at or near point -7885150.676182366
 5282400.9061096404
 LOCATION:  pg_notice, lwgeom_pg.c:265
 NOTICE:  00000: Self-intersection at or near point -7885150.676182366
 5282400.9061096404
 LOCATION:  pg_notice, lwgeom_pg.c:265
 ┌────────────┐
 │ st_isvalid │
 ├────────────┤
 │ t          │
 │ t          │
 │ t          │
 │ t          │
 │ t          │
 │ t          │
 │ t          │
 │ t          │
 │ t          │
 │ t          │
 │ t          │
 │ t          │
 │ t          │
 │ t          │
 └────────────┘
 (14 rows)
 }}}


 Exhibit 1:
 {{{
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 }}}

 Exhibit 2:
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 }}}

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Ticket URL: <https://trac.osgeo.org/geos/ticket/980>
GEOS <http://trac.osgeo.org/geos>
GEOS (Geometry Engine - Open Source) is a C++ port of the Java Topology Suite (JTS).