GeoJSON
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]
GeoJSON | ||||
---|---|---|---|---|
Bestandsextensie | .json | |||
MIME-type | application/json | |||
Ontwikkeld door | https://geojson.org/ | |||
|
Voorbeeld
bewerken{
"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
bewerkenType | 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]]
]
}
| |
{
"type": "Polygon",
"coordinates": [
[[35, 10], [45, 45], [15, 40], [10, 20], [35, 10]],
[[20, 30], [35, 35], [30, 20], [20, 30]]
]
}
|
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]]
]
]
}
| |
{
"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
bewerkenHet 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
bewerkenHet 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
bewerken- ↑ GeoJSON formaat Specificaties. Gearchiveerd op 30 juni 2023.
- ↑ iOS Location and Maps Programming Guide
- ↑ https://web.archive.org/web/20100316141001/http://openlayers.org/dev/examples/vector-formats.html
- ↑ https://leafletjs.com/reference.html#geojson
- ↑ https://web.archive.org/web/20091213135246/http://svn.codehaus.org/geoserver/tags/2.0.0-alpha1/geoserver/release/README.txt
- ↑ https://web.archive.org/web/20100317205437/http://geodjango.org/docs/db-api.html
- ↑ https://web.archive.org/web/20090415054743/http://www.gdal.org/ogr/drv_geojson.html
- ↑ https://web.archive.org/web/20080724103529/http://www.safe.com/reader_writerPDF/geojson.pdf
- ↑ https://web.archive.org/web/20140627210054/http://developers.cartodb.com/documentation/cartodb-js.html
- ↑ https://web.archive.org/web/20100601122329/http://pugs.postgresql.org/files/Introduction_to_PostGIS_v1.0.pdf
- ↑ https://web.archive.org/web/20090502183602/http://svn.mapnik.org/tags/release-0.6.0/docs/api_docs/python/mapnik-module.html
- ↑ https://github.com/blog/1528-there-s-a-map-for-that. Gearchiveerd op 27 september 2016.
- ↑ March 2007 Archives by thread. Gearchiveerd op 8 april 2023.
Zie ook
bewerkenExterne links
bewerken- https://geojson.org/
- https://geojson.org/geojson-spec.html
- https://web.archive.org/web/20090522050557/http://www.directionsmag.com/article.php?article_id=2550
- https://web.archive.org/web/20140325234900/http://blog.programmableweb.com/2008/08/27/3-top-data-formats-for-map-mashups-kml-georss-and-geojson/
- https://web.archive.org/web/20090221220320/http://www.geowebguru.com/articles/97-technical-overview-geojson
- https://googlegeodevelopers.blogspot.com/2009/05/build-on-top-of-your-public-latitude.html
- https://www.afstand-berekenen.nl/uitleg