On 23 June 2014 19:46, Jeremy Palmer <jpal...@linz.govt.nz> wrote: > http://resources.arcgis.com/en/help/arcgis-rest-api/index.html#//02r3000000n1000000 >> >> Can you? >> There is no geometry of multipolygon specified. >> AFAIU, for multipolygon ESRI REST produces a hybrid: a Polygon that >> contains detached rings >> (or rings not in other rings, so they are not holes) and that is >> interpreted as multipolygon. >> >> Fun. > > The definition says polygons can have any number of rings, either exterior or > interior. Exterior rings are oriented clockwise, while holes are oriented > counter-clockwise.
It does not say anything about interpreting such a multi-exterior ring as multipolygon, either, OGC or GeoJSON ones. It is just a description of ESRI-specific JSON-encoded kind of polygon geometry. > Maybe the OGR driver should be improved to check for this. If more than one > exterior ring is found then an OGC multi-polygon geometry object should be > returned. Could check the orientation via area or the > http://en.wikipedia.org/wiki/Even%E2%80%93odd_rule Might be. I just pointed out that OGR GeoJSON driver is dedicated to GeoJSON specifically, not any JSON-encoded format of geometry. Best regards, -- Mateusz Łoskot, http://mateusz.loskot.net _______________________________________________ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
