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GeoJSON in JSON-LD contexts
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Coordinates to RDF doesn't work #32

Closed pietercolpaert closed 8 years ago

pietercolpaert commented 9 years ago

Take for instance this example:

{
  "@context": {
    "geojson": "http://ld.geojson.org/vocab#",
    "Feature": "geojson:Feature", 
    "features": {
        "@id": "geojson:features", 
        "@container": "@set"
      }, 
      "title": "http://purl.org/dc/terms/title", 
      "coordinates": {
        "@id": "geojson:coordinates",
        "@container" : "@list"
      }, 
      "type": "@type", 
      "description": "http://purl.org/dc/terms/description",
      "properties": "geojson:properties", 
      "geometry": "geojson:geometry", 
      "FeatureCollection": "geojson:FeatureCollection", 
      "LineString": "geojson:LineString",
      "gtfs": "http://vocab.gtfs.org/terms#",
      "stop": {
          "@id": "gtfs:Stop",
          "@type": "@id"
      }
    },

    "@id" : "http://example.org/shapes/shape1",
    "type": "FeatureCollection", 
    "features": [
      {
        "type": "Feature",
        "properties": {
          "description": "Torhout - Lichtervelde",
          "stop": [ "http://irail.be/stations/NMBS/008891314","http://irail.be/stations/NMBS/008892205"]
        },
        "geometry": {
        "type": "LineString", 
        "coordinates": [
          [
            3.1057405471801753,
            51.064216229943476
          ],
          [
            3.1056976318359375,
            51.063434090307574
          ]
        ]
      }
    } 
  ]
}

Converted to RDF triples, this gives 

<http://example.org/shapes/shape1> <http://ld.geojson.org/vocab#features> _:b0 .
<http://example.org/shapes/shape1> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://ld.geojson.org/vocab#FeatureCollection> .
_:b0 <http://ld.geojson.org/vocab#geometry> _:b1 .
_:b0 <http://ld.geojson.org/vocab#properties> _:b2 .
_:b0 <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://ld.geojson.org/vocab#Feature> .
_:b1 <http://ld.geojson.org/vocab#coordinates> "3.105697631835938E0"^^<http://www.w3.org/2001/XMLSchema#double> .
_:b1 <http://ld.geojson.org/vocab#coordinates> "3.105740547180175E0"^^<http://www.w3.org/2001/XMLSchema#double> .
_:b1 <http://ld.geojson.org/vocab#coordinates> "5.106343409030757E1"^^<http://www.w3.org/2001/XMLSchema#double> .
_:b1 <http://ld.geojson.org/vocab#coordinates> "5.106421622994348E1"^^<http://www.w3.org/2001/XMLSchema#double> .
_:b1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://ld.geojson.org/vocab#LineString> .
_:b2 <http://purl.org/dc/terms/description> "Torhout - Lichtervelde" .
_:b2 <http://vocab.gtfs.org/terms#Stop> <http://irail.be/stations/NMBS/008891314> .
_:b2 <http://vocab.gtfs.org/terms#Stop> <http://irail.be/stations/NMBS/008892205> .

These coordinates are not usable in this form as I have no idea which lon and lat has to be used together to form a coordinate