Thanks a lot for taking you time to explain. So if Postgis actually not limit only to the simple-feature model the ST_IsValid, what kinds of geometries are InValid in PostGIS terms?
So does this make my example non-compliant with OGC SFA? I'm not topology expert and asking for the practical reasons, the software that claims to be OGC-compliant cannot import such data correctly. If such structures are indeed not covered by OGC SFA then I cannot do anything, if they are allowed, than this is a software issue and it is in fact not compliant. 2010/3/31 Andrea Peri <aperi2...@gmail.com>: >>with two duplicate nodes. When I try to check it with ST_IsValidReason >>function I get message >>that it is Valid Geometry. Is this OGC compliant? When I try to check >>it with QGIS, ArcView or > >>ArcGIS - I get notice about self intersection. Please explain this >> situation. > > Hi, > > give my explain... > > The selfintersect is an invalidity for OGC because OGC use the > simple-feature model. > > Postgis actually not limit only to the simple-feature model the ST_IsValid. > (even if other postgis functions are simple-feature only) > > Another think to understand is that the OCG-simple-feature model actually is > only 2D and don't know the 3D dimension. > > So is quite difficult limit the ST_IsValid only to the simple-fature model. > > -- > ----------------- > Andrea Peri > . . . . . . . . . > qwerty àèìòù > ----------------- > > > _______________________________________________ > postgis-users mailing list > postgis-users@postgis.refractions.net > http://postgis.refractions.net/mailman/listinfo/postgis-users > > _______________________________________________ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users
