[gdal-dev] Esri JSON Curves

[Even Rouault]

On jeudi 19 octobre 2017 13:38:38 CEST James Klassen wrote:
> Has anyone looked at reading curved geometries from an Esri rest service
> queried with "returnTrueCurves=true"?
> 
> My end goal is to import the data into PostGIS. We were successful using
> ogr2ogr to translate the curved features from a geodatabase download in the
> past, but that download is being replaced with a rest service.  OGR reads
> the rest service correctly without "returnTrueCurves=true", but we would
> like to preserve the integrity of the curves in the source data if possible.
> 
> It doesn't look like there is any code in GDAL 2.2 to deal with this
> situation.  `ogresrijsonreader.cpp:OGRESRIJSONReadPolygon()` looks like it
> is only looking for a "rings" member, not "curveRings", etc.

This is indeed not supported at the moment.
It appears to be documented in
http://resources.arcgis.com/en/help/arcgis-rest-api/index.html#//02r3000000n1000000#CURVE

The data model is, non suprisingly, super close to what exists in Personnal Geodatabase
or FileGeodatabase. Arc/CircularArc could be translated to CIRCULARSTRING/COMPOUNDCURVE/
CURVEPOLYGON. Bezier curves would have to be linearized since there's no equivalent in
OGC SF / ISO SQL-MM Part 3 standards.
So this is "just" a matter of coding it. 

Even

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