[gdal-dev] ArcGIS RestAPI JSON Polygons

[Jeremy Palmer]

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.

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

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