[postgis-devel] Adding 4D support to asGeoJson

[Paul Ramsey]

Approach in the code looks fine to me.

P

> On Jan 30, 2018, at 3:00 PM, Alexandre Lessard <alessard at mapgears.com> wrote:
> 
> 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
>>> 
>>> 
>>> _______________________________________________
>>> postgis-devel mailing list
>>> postgis-devel at lists.osgeo.org
>>> https://lists.osgeo.org/mailman/listinfo/postgis-devel
>> _______________________________________________
>> postgis-devel mailing list
>> postgis-devel at lists.osgeo.org
>> https://lists.osgeo.org/mailman/listinfo/postgis-devel
> 
> _______________________________________________
> postgis-devel mailing list
> postgis-devel at lists.osgeo.org
> https://lists.osgeo.org/mailman/listinfo/postgis-devel