geojson

 

Geographic JSON 简称GeoJson，是一种使用json格式的地理信息数据结构。

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{
  "type": "Feature",
  "geometry": {
    "type": "Point",
    "coordinates": [125.6, 10.1]
  },
  "properties": {
    "name": "Dinagat Islands"
  }
}

GeoJson支持的地理信息格式有Point, LineString, Polygon, MultiPoint, MultiLineString, and MultiPolygon。

有额外属性的地理信息主体(Geometric objects)称为Feature，Feature集合称为FeatureCollection。

上述例子中，为Point Feature，经纬度坐标为125.6,10.1，有一个name属性，该Point的name为”Dinagat Islands”。

A GeoJSON FeatureCollection:

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   {
	"type": "FeatureCollection",
	"features": [{
		"type": "Feature",
		"geometry": {
			"type": "Point",
			"coordinates": [102.0, 0.5]
		},
		"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": {
			"prop0": "value0",
			"prop1": 0.0
		}
	}, {
		"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": {
			"prop0": "value0",
			"prop1": {
				"this": "that"
			}
		}
	}]
}

更多详细的信息可以参考The GeoJSON Specification (RFC 7946)

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