[GeoJSON] Fwd: data series, time series in GeoJSON

[Matt McClure]

Hi,

I'm reading the GeoJSON spec as I'm working on a way to represent time
series data. I've looked through the mailing list archives and I've
found a conversation from October[1] and November 2011[2], and a
rejected proposal on the wiki.[3]

Does section 3[4] allow arbitrary CRS values, or does the condition
that "" disqualify all CRSs that would use dimensions other than one
of the two examples in section 2.1.1.[5]?

I wonder if a time series representation would conform to the existing
GeoJSON 1.0 spec using an alternative CRS. For example, using URNs as
described in "Definition identifier URNs in OGC namespace"[6], I might
construct a compound CRS and use it as follows:

    {
      "crs": {
        "type": "name",
        "properties": {
          "name":
"urn:ogc:def:crs,dataType:OGC:1.1:time,crs:OGC:1.3:CRS84,verticalDatumType:OGC:1.0:geoidal"
        }
      },
      "type": "LineString",
      "coordinates": [
        [<time>, <lat>, <lng>, <alt>], [...], ...,
      ]
    }

Would an example like this conform to GeoJSON 1.0?

Best,
Matt

[1]: http://lists.geojson.org/htdig.cgi/geojson-geojson.org/2011-October/000597.html
[2]: http://lists.geojson.org/htdig.cgi/geojson-geojson.org/2011-November/000601.html
[3]: https://github.com/GeoJSONWG/geojson-spec/wiki/Data-Series-Proposal
[4]: http://www.geojson.org/geojson-spec.html#coordinate-reference-system-objects
[5]: http://www.geojson.org/geojson-spec.html#positions
[6]: http://portal.opengeospatial.org/files/?artifact_id=24045


-- 
Matt McClure
http://matthewlmcclure.com
http://www.mapmyfitness.com/profile/matthewlmcclure