You can also do the same trick, but reverted. This time use buffer (positiv), buffer(negativ). This should suppress the error in exterior ring.
I have to say this kind of filtering is not ideal to correct geometry ... You would probably need a more serious way of cleaning you polygon . Cheers, Rémi-C 2014-02-11 17:24 GMT+01:00 Nicolas Ribot <[email protected]>: > Hi, > > You should try st_buildArea, or st_polygonize, as suggested by Remi. It > corrects these kinds of errors. > > Nicolas > > > On 11 February 2014 17:21, Richard LEHAUT <[email protected]> wrote: > >> My problem is the exterior ring of the polygon. There are points inside >> of this ring >> http://hpics.li/2807e0d >> These points make needless segments >> http://imagik.fr/uploads/75091 (Inside black circle) >> Cheers, >> Richard L >> >> Le 11/02/2014 17:02, Rémi Cura a écrit : >> >> What is the problem? >> What are "internal" lines? >> Cheers, >> Rémi-C >> >> >> 2014-02-11 16:59 GMT+01:00 Richard LEHAUT <[email protected]>: >> >>> Thanks for response >>> The fourth proposition is correct for external but not internal lines : >>> ST_Buffer (ST_Buffer (the_geom), -0.1), 0.1 >>> >>> Look http://imagik.fr/uploads/75091 >>> Do you have an idea to solve this new problem? >>> >>> >>> Cheers, >>> Richard L >>> >>> Le 10/02/2014 13:56, Rémi Cura a écrit : >>> >>> simplify >>> simplify preserve topology >>> polygonise then filter on area, >>> opening operator (negativ buffer of X then positiv buffer of X) >>> ... >>> >>> Cheers, >>> >>> Rémi-C >>> >>> >>> 2014-02-10 13:43 GMT+01:00 Richard LEHAUT <[email protected]>: >>> >>>> Hi >>>> I succeeded to correct interior rings, but I've problem wih interior >>>> rings. >>>> Looks this screen (black circle). http://imagik.fr/view-rl/74788 >>>> Do you idea to resolve my problem? >>>> Thanks >>>> Richard L >>>> >>>> _______________________________________________ >>>> postgis-users mailing list >>>> [email protected] >>>> http://lists.osgeo.org/cgi-bin/mailman/listinfo/postgis-users >>>> >>> >>> >>> >>> >> >> >> _______________________________________________ >> postgis-users mailing list >> [email protected] >> http://lists.osgeo.org/cgi-bin/mailman/listinfo/postgis-users >> > >
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