[gdal-dev] ArcGIS RestAPI JSON Polygons

[Jukka Rahkonen]

Mateusz Łoskot <mateusz <at> loskot.net> writes:

> 
> On 23 June 2014 03:32, Jeremy Palmer <JPalmer <at> linz.govt.nz> wrote:
> >
> > Is this a bug in the data from the service, or just the way the Esri
defines geometry objects (and therefor an
> OGR bug)?
> 
> AFAIU, this is not a bug in OGR, but OGR GeoJSON drivers works with
> GeoJSON format
> whereas JSON produced by ESRI is a different format, not GeoJSON.
> 
> > I can’t see a definition for multi-polygons in Esri API docs:
> >
> >
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.

Based on
http://help.arcgis.com/en/webapi/flex/apiref/com/esri/ags/geometry/Polygon.html
when geometries are built the ring is first added and by doing "Contais"
ESRI decides if the ring is a hole or another outer ring.

-Jukka Rahkonen-