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About JSON-FG

OGC Features and Geometries JSON (JSON-FG) is a proposal for extending GeoJSON with support for a.o.

  1. Temporal information

  2. Additional geometry types

  3. Coordinate reference systems (CRS) other than WGS84

  4. Metadata about the feature types in a feature collection, using feature schemas

We test the JSON-FG draft specification and implementation on these components.

Temporal information

JSON-FG adds to GeoJSON a standardized method to include temporal aspects for feature instances: date, time, and interval.

Additional geometry types

GeoJSON only supports a limited number of geometry types in the geometry-attribute: (MULTI)POINT, (MULTI)LINE, (MULTI)POLYGON and GEOMETRYCOLLECTION. JSON-FG extends GeoJSON with 3D solid geometry to include (MULTI)POLYHEDRON and (MULTI)PRISM in a separate place attribute.

Coordinate reference systems

GeoJSON formally allows only geometry in the WGS'84 CRS to be included in the geometry attribute. JSON-FG makes it possible to include geometry in other CRS in a separate place attribute.

Feature types and feature schema

JSON-FG describes how to add knowledge about the feature type in a feature collection, both homogeneous and heterogeneous in terms of the feature types, using for example feature schemas.