Hey, it looks like a classical precision issue. There are some workaround but they are a little bit annoying.
Cheers, Rémi-C 2014-05-23 13:46 GMT+02:00 Jeff Adams - NOAA Affiliate <[email protected]> : > Greetings, > > I have been working with the st_split function and have been receiving > strange results. Specifically, I have been using a polygon geometry to > split a linestring geometry. After the split I have been using st_within to > identify which of the resulting split linestring geometries are inside and > which are outside. Sometimes the st_within results are as expected, other > times, split linestring geometries that are clearly within the polygon > feature (they were created using the polygon as the blade) are not > identified as so. When checking in ArcGIS, the features that returned false > using the st_within function in PostGIS (but by the nature of how they were > created should be within the polygon) are being identified by ArcGIS as > being within the polygon. Does anybody know why PostGIS' st_within is > returning false with these features? Any workarounds? I am performing this > analysis on a fairly large dataset. > > Thanks in advance... > Jeff > > _______________________________________________ > 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
