[gdal-dev] Call for discussion on RFC 64: Triangle, Polyhedral surface and TIN

jratike80 jukka.rahkonen at maanmittauslaitos.fi
Wed Dec 7 01:01:54 PST 2016

Even Rouault-2 wrote
> Hi,
> This is a call to discuss the proposed RFC 64: Triangle, Polyhedral
> surface and TIN
>     https://trac.osgeo.org/gdal/wiki/rfc64_triangle_polyhedralsurface_tin
> ~~~~~

I am wondering this part:
"GEOS methods are still used in some cases, but with the following
limitations - a Triangle is converted to a Polygon with one exterior ring;
Polyhedral Surfaces and Triangulated Surfaces are converted to
MultiPolygons?. (each Triangle in a Triangulated Surface is converted to a
Polygon as described previously)"

Does it mean presenting a TIN with two triangles as something like

As far as I know such multipolygon is not valid accorfing to the Simple
feature specification where "boundaries and may touch at only a finite
number of Points". Valid presentation would probably be to wrap polygons
into GeometryCollection. Is GEOS used in a relaxed way so that shared parts
of boundaries in MultiPolygons do not throw an error?

-Jukka Rahkonen-

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