>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 -----------------
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