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GeoJSON is a json format created in 2008.

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GeoJSON is an open standard format designed for representing simple geographical features, along with their non-spatial attributes. It is based on JSON, the JavaScript Object Notation. The features include points (therefore addresses and locations), line strings (therefore streets, highways and boundaries), polygons (countries, provinces, tracts of land), and multi-part collections of these types. Read more on Wikipedia...

Example from Wikipedia:
{ "type":"Topology", "transform":{ "scale": [1,1], "translate": [0,0] }, "objects":{ "two-squares":{ "type": "GeometryCollection", "geometries":[ {"type": "Polygon", "arcs":[[0,1]],"properties": {"name": "Left_Polygon" }}, {"type": "Polygon", "arcs":[[2,-1]],"properties": {"name": "Right_Polygon" }} ] }, "one-line": { "type":"GeometryCollection", "geometries":[ {"type": "LineString", "arcs": [3],"properties":{"name":"Under_LineString"}} ] }, "two-places":{ "type":"GeometryCollection", "geometries":[ {"type":"Point","coordinates":[0,0],"properties":{"name":"Origine_Point"}}, {"type":"Point","coordinates":[0,-1],"properties":{"name":"Under_Point"}} ] } }, "arcs": [ [[1,2],[0,-2]], [[1,0],[-1,0],[0,2],[1,0]], [[1,2],[1,0],[0,-2],[-1,0]], [[0,-1],[2,0]] ] }
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