[postgis-tickets] [PostGIS] #5225: ST_SIMPLIFYPRESERVETOPOLOGY instability on some MULTILINESTRING

PostGIS trac at osgeo.org
Wed Aug 24 09:09:15 PDT 2022


#5225: ST_SIMPLIFYPRESERVETOPOLOGY instability on some MULTILINESTRING
------------------------+--------------------------
 Reporter:  cactusbone  |      Owner:  pramsey
     Type:  defect      |     Status:  new
 Priority:  low         |  Milestone:  PostGIS GEOS
Component:  postgis     |    Version:  3.2.x
 Keywords:              |
------------------------+--------------------------
 I have a question.

 It seems ST_SIMPLIFYPRESERVETOPOLOGY (from postgis, which documentation
 says it is performed by the geos module) sends varying data with some
 MULTILINESTRING inputs

 It also seems that the longer the MULTILINESTRING, the greater the chance
 of variation.

 My question: is this a bug or something to be expected ?

 example SQL : (run a few times, check that diff is sometimes not empty)
 {{{
 SELECT ST_ASTEXT(A), a,
         ST_ASTEXT(ST_DIFFERENCE(A,A)) AS DIFF
 FROM (
                 SELECT ST_SIMPLIFYPRESERVETOPOLOGY(WAY,1222) AS A
         FROM (SELECT ST_GEOMFROMTEXT(
         'MULTILINESTRING((194310.3864375258
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 6269668.671623153,212927.60279313088 6269747.659969178,212654.14646399723
 6269802.8233715175,212483.09293444428 6269824.614116857,212408.41982002018
 6269831.159830317,212191.34681297326 6269838.383861936,211998.31881593776
 6269841.673681193,211873.9415488744 6269845.557026199,210892.30401516115
 6269862.04006501,210446.35813504332 6269870.315512252,209374.51841794027
 6269887.171673696,209190.60748720073 6269888.273938942,208845.5170657416
 6269873.89362822,208584.40606813686 6269851.678809498,208322.51583409662
 6269819.798102936,208119.68058992218 6269787.374869348,207838.4764242293
 6269733.17815191,207666.2651719721 6269693.32784602,207500.0763041668
 6269651.188471549,207094.13864904008 6269527.942605048,207010.21488493102
 6269499.573248141,206915.03672030274 6269469.050436069,206405.47175119657
 6269260.463879191,205872.1289388569 6269025.413802074,205509.60588513955
 6268865.823577013,205338.81952236447 6268798.356409601,205229.83774087788
 6268760.79952401,205129.21605314984 6268728.482084657,205004.1708691418
 6268697.33470097,204937.22332737868 6268683.159881713,204672.08256420726
 6268635.854137745,204370.6739109354 6268613.6256161155,204261.52515021258
 6268613.47301777,204135.43356299106 6268617.254066456,203986.54374405506
 6268624.867035082,203844.71158083534 6268640.4999231035,203624.3657807591
 6268684.635011318,203495.53573406406 6268709.915720742,203397.38533903164
 6268732.63620819,203350.37511806964 6268743.369116401,202970.9426337008
 6268826.943839294,202600.93891020207 6268911.401098567,202196.83802667345
 6268999.894763305,202016.15536116686 6269030.53457528,201871.68492601535
 6269047.066894041,201731.35557592136 6269057.528901179,201616.9970630294
 6269060.801460366,201488.60116234847 6269057.8171576345,201368.87705000027
 6269051.84855534,201231.82049293566 6269038.114003561,201055.81324604238
 6269011.509731532,200931.7922013496 6268991.348869861,200526.58925486208
 6268901.057963869,200204.19687757565 6268843.136643355,199764.70752792383
 6268786.250018328,199346.39114542087 6268756.679297957,198995.5343743386
 6268745.810727753,198173.98540033516 6268752.711674767,197670.8101700005
 6268765.411466662,197477.55953398338 6268779.162531202,197360.328978229
 6268791.52324825,197084.12305767272 6268832.776636343,196819.97303796935
 6268881.422998699,196631.9766819177 6268913.673198705))'
 ) as way ) as t ) as t
 }}}

 result (screen from pgAdmin)
 ![image](https://user-
 images.githubusercontent.com/1227612/186465718-4fb611c1-aa63-408a-92dd-
 3119f144aefb.png)

 Version: `POSTGIS="3.2.2 628da50" [EXTENSION] PGSQL="140"
 GEOS="3.9.0-CAPI-1.16.2" PROJ="7.2.1" GDAL="GDAL 3.2.2, released
 2021/03/05" LIBXML="2.9.10" LIBJSON="0.15" LIBPROTOBUF="1.3.3"
 WAGYU="0.5.0 (Internal)" TOPOLOGY RASTER`
-- 
Ticket URL: <https://trac.osgeo.org/postgis/ticket/5225>
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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