[postgis-devel] Adding 4D support to asGeoJson

[Alexandre Lessard]

The original GeoJson spec allowed it and openlayers already treats the 
fourth dimension as the measure, using a XYZM layout.

I can't think of better way to pass the M data from postgis to a client 
app such as openlayers than through GeoJson.

Alex L.

On 2018-01-30 17:25, Paul Ramsey wrote:
> https://tools.ietf.org/html/rfc7946#section-3.1.1
>
> "Implementations SHOULD NOT extend positions beyond three elements
> because the semantics of extra elements are unspecified and
> ambiguous."
>
> Do we really want to go there?
>
> P
>
> 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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