On Thu, February 23, 2012 8:46 am, Astrid Emde wrote: > Hello, > > > I want to check whether my polygons follow the Right-Hand-Rule. Is there > a function to do this? > > I found the function ST_ForceRHR [1] that will modify my polygons to > follow the rule. But it would be nice to check first which polygons will be > effected. > > Astrid > > > [1] http://www.postgis.org/documentation/manual-1.5/ST_ForceRHR.html
Hello, I used the following SQL to find out which polygons do not follow the RHR: Select gid, st_orderingEquals(the_geom, st_forceRHR(the_geom)) from mytable where st_orderingEquals(the_geom, st_forceRHR(the_geom)) = false; Astrid _______________________________________________ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users
