[postgis-users] ST_Buffer malfunction on LINESTRING

[Paul Ramsey]

"somehow", doh!
If JTS is not working, we did it accidentally, yay
P

> On Aug 26, 2020, at 2:36 PM, Mike Taves <mwtoews at gmail.com> wrote:
> 
> I can confirm that this was an issue for previous GEOS, but it is now
> fixed in master, somehow.
> 
> However, I'm getting the same odd behaviour with JTS testbuilder (from
> master, I think). Martin could possibly confirm.
> 
> On Thu, 27 Aug 2020 at 03:42, Paul Ramsey <pramsey at cleverelephant.ca> wrote:
>> 
>> Try some more recent versions. I'm finding with my very-fresh GEOS I'm getting a poly-with-hole, just as you are.
>> P.
>> 
>>> On Aug 26, 2020, at 2:58 AM, Michal Seidl <michal.seidl at gmail.com> wrote:
>>> 
>>> Hello,
>>> I am facing this malfunction of ST_Buffer. The result of closed LINESTRING buffer should be polygon with hole but regular polygon is returned?
>>> 
>>> I am using:
>>> POSTGIS="2.1.4 r12966" GEOS="3.4.2-CAPI-1.8.2 r3921" PROJ="Rel. 4.8.0, 6 March 2012" GDAL="GDAL 1.10.1, released 2013/08/26" LIBXML="2.9.1" LIBJSON="UNKNOWN" RASTER
>>> 
>>> This is the case
>>> ST_AsText(ST_Buffer(ST_GeomFromText('LINESTRING(-632707.74 -1143841.28,-632728.28 -1143828.04,-632761.31 -1143818.48,-632747.42 -1143835.92,-632727.41 -1143861.05,-632687.29 -1143893.42,-632587.04 -1143963.89,-632469.61 -1144047.39,-632439.8 -1144068.97,-632426.45 -1144083.11,-632422.85 -1144089.95,-632423.07 -1144099.75,-632426.7 -1144107.51,-632427.54 -1144108.41,-632426.4 -1144109.46,-632425.57 -1144108.56,-632411.95 -1144094.85,-632403.98 -1144087.66,-632393.94 -1144079.17,-632371.19 -1144059.68,-632381.11 -1144052.77,-632398.98 -1144062.1,-632407.15 -1144063.46,-632420.6 -1144058,-632457.53 -1144030.85,-632521.98 -1143975.36,-632585.23 -1143928.05,-632634.76 -1143892.41,-632627.84 -1143886.95,-632631.46 -1143883.96,-632637.6 -1143889.98,-632684 -1143856.57,-632707.74 -1143841.28)'), 0.001)) AS wkt_geometry
>>> 
>>> If I enlarge buffer distance to 0.01 result looks OK. Also if I change from default propeties to endcap=square join=miter helps?
>>> 
>>> Anu suggestions?
>>> 
>>> Thanks Michal S.
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>> 
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