[postgis-devel] Adding 4D support to asGeoJson

Paul Ramsey pramsey at cleverelephant.ca
Tue Jan 30 14:25:20 PST 2018


"Implementations SHOULD NOT extend positions beyond three elements
because the semantics of extra elements are unspecified and

Do we really want to go there?


On Tue, Jan 30, 2018 at 2:13 PM, Alexandre Lessard
<alessard at mapgears.com> wrote:
> Hi,
>     we are looking into using POINT4D points with Postgis, but we need to
> communicate in GeoJson. We've looked into the code and we'd like to know if
> adding an other condition using "if (!FLAGS_GET_M(pa->flags))"" in
> liblwgeom/lwout_geojson.c function pointArray_to_geojson() to support the
> fourth dimension would be the best option?
> Here's an example of what we would do
> https://github.com/belug23/postgis/compare/svn-trunk...belug23-4d-geojson
> Thanks.
> Alexandre Lessard
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