Thanks! Le lun. 1 juil. 2019 à 11:25, Martin Davis <[email protected]> a écrit :
> Yes, that is correct. > > As per the Simple Features for SQL standard, Linear Rings include a > closing point which is equal to the start point, and all points are > included in the count. Polygons are made up of rings, so inherit this > behaviour. > > On Mon, Jul 1, 2019, 4:46 AM Etienne B. Racine <[email protected]> > wrote: > >> >> Hi list, >> >> I'm implementing postgis compatible functions for R, so I wanted to make >> sure I had the right behavior. I wanted to check that the behavior of >> ST_NPoints was consistent with expectations. >> SELECT ST_NPoints('POLYGON((0 0, 1 1, 2 0, 0 0))'::geometry); >> #> st_npoints >> #> ------------ >> #> 4 >> I would have expected that the repeated vertex wouldn't be counted (a >> triangle would have 3 vertices). The doc (*Return the number of points >> in a geometry*) seems to imply that the behavior is correct though, >> since a point isn't necessarly a vertex; but it still leaves room to >> interpretation. >> >> Etienne >> >> _______________________________________________ >> postgis-users mailing list >> [email protected] >> https://lists.osgeo.org/mailman/listinfo/postgis-users > > _______________________________________________ > postgis-users mailing list > [email protected] > https://lists.osgeo.org/mailman/listinfo/postgis-users
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