GeoJSON

GeoJSON
Bestandsextensie	.json
MIME-type	application/json
Ontwikkeld door	https://geojson.org/
Portaal	Informatica

GeoJSON^[1] is een formaat voor het vastleggen van geografische kenmerken samen met andere (niet ruimtelijke) data door middel van JavaScript Object Notatie. De kenmerken zijn punten (adressen en locaties), lijnen (straten, snelwegen, grenzen), veelhoeken (landen, provincies, gemeenten), en meervoudig samengestelde verzamelingen daarvan. GeoJSON-kenmerken hoeven niet per se fysiek bestaande zaken weer te geven.^[2]

Voorbeeld

{
  "type": "FeatureCollection",
  "features": [
    {
      "type": "Feature",
      "geometry": {
        "type": "Point",
        "coordinates": [102.0, 0.6]
      },
      "properties": {
        "prop0": "value0"
      }
    },
    {
      "type": "Feature",
      "geometry": {
        "type": "LineString",
        "coordinates": [
          [102.0, 0.0], [103.0, 1.0], [104.0, 0.0], [105.0, 1.0]
        ]
      },
      "properties": {
        "prop1": 0.0,
        "prop0": "value0"
      }
    },
    {
      "type": "Feature",
      "geometry": {
        "type": "Polygon",
        "coordinates": [
          [
            [100.0, 0.0], [101.0, 0.0], [101.0, 1.0], [100.0, 1.0],
            [100.0, 0.0]
          ]
        ]
      },
      "properties": {
        "prop1": {
          "this": "that"
        },
        "prop0": "value0"
      }
    }
  ]
}

Meetkundige elementen

Elementaire meetkundige elementen
Type	Voorbeelden
Punt		{ "type": "Point", "coordinates": [30, 10] }
Lijnstuk		{ "type": "LineString", "coordinates": [ [30, 10], [10, 30], [40, 40] ] }
Polygoon		{ "type": "Polygon", "coordinates": [ [[30, 10], [40, 40], [20, 40], [10, 20], [30, 10]] ] }
Polygoon		{ "type": "Polygon", "coordinates": [ [[35, 10], [45, 45], [15, 40], [10, 20], [35, 10]], [[20, 30], [35, 35], [30, 20], [20, 30]] ] }

Meervoudige geometrische verzamelingen
Type	Voorbeelden
Puntenverzameling		{ "type": "MultiPoint", "coordinates": [ [10, 40], [40, 30], [20, 20], [30, 10] ] }
Meerdere lijnstukken		{ "type": "MultiLineString", "coordinates": [ [[10, 10], [20, 20], [10, 40]], [[40, 40], [30, 30], [40, 20], [30, 10]] ] }
Meerdere Polygonen		{ "type": "MultiPolygon", "coordinates": [ [ [[30, 20], [45, 40], [10, 40], [30, 20]] ], [ [[15, 5], [40, 10], [10, 20], [5, 10], [15, 5]] ] ] }
Meerdere Polygonen		{ "type": "MultiPolygon", "coordinates": [ [ [[40, 40], [20, 45], [45, 30], [40, 40]] ], [ [[20, 35], [10, 30], [10, 10], [30, 5], [45, 20], [20, 35]], [[30, 20], [20, 15], [20, 25], [30, 20]] ] ] }

Software

Het GeoJSON formaat wordt ondersteund door een groot aantal programma's waaronder OpenLayers,^[3] Leaflet, Geoforge software,^[4] GeoServer,^[5] GeoDjango,^[6] GDAL,^[7] Safe Software FME,^[8] en CartoDB,^[9]

Het is ook mogelijk GeoJSON te gebruiken met PostGIS^[10] en Mapnik,^[11]. Beide behandelen het formaat via de GDAL OGR-conversie bibliotheek. Bing Maps, Yahoo! en Google bieden ondersteuning voor GeoJSON in hun API-diensten. GitHub biedt ook GeoJSON rendering.^[12]

Historie

Het formaat is niet opgesteld door een formele organisatie, maar door een werkgroep van ontwikkelaars, de GeoJSON format working group vanaf maart 2007^[13]. De specificatie was klaar in juni 2008.

Referenties

Zie ook

Externe links

[1] GeoJSON formaat Specificaties. Gearchiveerd op 30 juni 2023.

[2] OS Location and Maps Programming Guide

[3] ttps://web.archive.org/web/20100316141001/http://openlayers.org/dev/examples/vector-formats.html

[4] ttps://leafletjs.com/reference.html#geojson

[5] ttps://web.archive.org/web/20091213135246/http://svn.codehaus.org/geoserver/tags/2.0.0-alpha1/geoserver/release/README.txt

[6] ttps://web.archive.org/web/20100317205437/http://geodjango.org/docs/db-api.html

[7] ttps://web.archive.org/web/20090415054743/http://www.gdal.org/ogr/drv_geojson.html

[8] ttps://web.archive.org/web/20080724103529/http://www.safe.com/reader_writerPDF/geojson.pdf

[9] ttps://web.archive.org/web/20140627210054/http://developers.cartodb.com/documentation/cartodb-js.html

[10] ttps://web.archive.org/web/20100601122329/http://pugs.postgresql.org/files/Introduction_to_PostGIS_v1.0.pdf

[11] ttps://web.archive.org/web/20090502183602/http://svn.mapnik.org/tags/release-0.6.0/docs/api_docs/python/mapnik-module.html

[12] ttps://github.com/blog/1528-there-s-a-map-for-that. Gearchiveerd op 27 september 2016.

[13] March 2007 Archives by thread. Gearchiveerd op 8 april 2023.

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