[postgis-tickets] [PostGIS] #4541: ST_ConcaveHull returns a "geometrycollection" type instead of the expected "polygon"

PostGIS trac at osgeo.org
Sat Aug 1 16:49:03 PDT 2020


#4541: ST_ConcaveHull returns a "geometrycollection" type instead of the expected
"polygon"
----------------------+---------------------------
  Reporter:  v89461   |      Owner:  robe
      Type:  defect   |     Status:  new
  Priority:  high     |  Milestone:  PostGIS 2.5.5
 Component:  postgis  |    Version:  2.5.x
Resolution:           |   Keywords:
----------------------+---------------------------

Comment (by robe):

 I was hoping I could blame this on GEOS, but seems with GEOS 3.8, all is
 good with 2.4.7


 {{{
 POSTGIS="2.4.7 r17322" PGSQL="100" GEOS="3.8.0-CAPI-1.13.1 " PROJ="Rel.
 5.2.0, September 15th, 2018" GDAL="GDAL 2.4.4, released 2020/01/08"
 LIBXML="2.7.8" LIBJSON="0.12" LIBPROTOBUF="1.2.1" RASTER
 }}}

 Yields -


 {{{
 POLYGON((578430.72 1226431.49,578423.79 1226455.51,579600.81
 1226795.01,580801.84 1227141.44,581978.86 1227480.95,582963.7
 1227765.03,583324.01 1227868.96,584501.03 1228208.46,585702.06
 1228554.89,586879.08 1228894.4,588056.09 1229233.9,589257.12
 1229580.34,590434.14 1229919.84,591611.15 1230259.35,592788.17
 1230598.85,593989.2 1230945.29,595166.21 1231284.79,596343.23
 1231624.3,597544.26 1231970.73,597616.32 1231991.52,598793.34
 1232331.02,599610.04 1232566.6,599706.12 1232594.31,599730.15
 1232601.24,598553.13 1232261.73,597352.1 1231915.3,596175.08
 1231575.79,595893.76 1231468.63,595869.74 1231461.7,595821.7
 1231447.84,595629.54 1231392.41,594452.52 1231052.91,593251.49
 1230706.48,592074.47 1230366.97,590897.46 1230027.47,589696.43
 1229681.03,588519.41 1229341.53,587342.4 1229002.02,586165.38
 1228662.52,585492.81 1228468.51,585132.5 1228364.58,583955.48
 1228025.08,582754.45 1227678.65,581577.43 1227339.14,580400.42
 1226999.64,580256.3 1226958.06,579079.28 1226618.56,578622.89
 1226486.91,578454.74 1226438.41,578430.72 1226431.49))
 }}}


 3.1.0dev no surprise has the same issue

 {{{
 POSTGIS="3.1.0dev 3.1.0alpha2-33-g626556b35" [EXTENSION] PGSQL="130"
 GEOS="3.9.0-CAPI-1.14.0" SFCGAL="1.3.8" PROJ="6.2.1" GDAL="GDAL 3.0.2,
 released 2019/10/28" LIBXML="2.9.9" LIBJSON="0.12" LIBPROTOBUF="1.2.1"
 WAGYU="0.5.0 (Internal)" (core procs from "3.1.0dev
 3.1.0alpha2-23-g81b9af77b" need upgrade) RASTER (raster procs from
 "3.1.0dev 3.1.0alpha2-23-g81b9af77b" need upgrade) (sfcgal procs from
 "3.1.0dev 3.1.0alpha2-23-g81b9af77b" need upgrade)
 }}}


 {{{
 GEOMETRYCOLLECTION(POINT(578615.96 1226510.94),POINT(578760.08
 1226552.51),POINT(578784.1 1226559.44),POINT(578928.23
 1226601.01),POINT(578952.25 1226607.94),POINT(578976.27
 1226614.87),POINT(578983.2000000001 1226590.84),POINT(579007.22
 1226597.77),POINT(579072.35 1226642.58),POINT(579096.37
 1226649.51),POINT(579120.39 1226656.44),POINT(579144.41
 1226663.37),POINT(579175.36 1226646.27),POINT(579199.38
 1226653.2),POINT(579223.41 1226660.1300000001),POINT(579240.5
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 1226711.87),POINT(579336.58 1226718.8),POINT(579343.51
 1226694.77),POINT(579367.53 1226701.7),POINT(579384.62
 1226732.6500000001),POINT(579391.55 1226708.6300000001),POINT(579408.64
 1226739.58),POINT(579415.5700000001 1226715.56),POINT(579432.66
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 1226760.37),POINT(579504.73 1226767.3),POINT(579535.67
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 }}}

-- 
Ticket URL: <https://trac.osgeo.org/postgis/ticket/4541#comment:6>
PostGIS <http://trac.osgeo.org/postgis/>
The PostGIS Trac is used for bug, enhancement & task tracking, a user and developer wiki, and a view into the subversion code repository of PostGIS project.


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