Description of GeoJSON data types
GeoJSON always consists of a single object. This object (referred to as the GeoJSON object below) represents a geometry, feature, or collection of features.
The GeoJSON object may have any number of members (name/value pairs).
The GeoJSON object must have a member with the name "type". This member's value is a string that determines the type of the GeoJSON object.
The value of the type member must be one of: "Point", "MultiPoint", "LineString", "MultiLineString", "Polygon", "MultiPolygon", "GeometryCollection", "Feature", or "FeatureCollection". The case of the type member values must be as shown here.
A GeoJSON object may have an optional "crs" member, the value of which must be a coordinate reference system object (see 3. Coordinate Reference System Objects).
A GeoJSON object may have a "bbox" member, the value of which must be a bounding box array (see 4. Bounding Boxes).
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