OGC Moving Features Encoding Extension – JSON provides an IETF GeoJSON encoding for OGC Moving Features as an alternative to XML Core or Simple CSV. A moving feature contains a temporal geometry, whose location continuously changes over time, as well as dynamic non-spatial attributes whose values vary with time. The JSON Encoding Extension supports, 0- (point trajectories), 1- (lines), 2- (polygons), and 3-dimensional (polyhedrons) objects with locations and/or properties that vary over time.
The ability to attribute time-varying properties to an object (rather than just varying its location or trajectory), has utility and value in many current application areas, including: Location Based Services, Intelligent Transportation Systems, Disaster Risk Management Systems, and Smart City Applications. For example, the traffic congestion on roads and ‘hotspots’ of air pollution are typical moving features seen in the real world.
The representation of the following phenomena in a spatiotemporal domain is within the scope of this Encoding Standard:
- Discrete phenomena, which exist only on a set of instants, such as road accidents;
- Step phenomena, where the changes of locations are abrupt at an instant, such as administrative boundaries;
- Continuous phenomena, whose locations move continuously for a period in time, such as vehicles, typhoons, or floods.
The candidate OGC Moving Features Encoding Extension – JSON is available for review and comment on the OGC Portal. Comments are due by the 21st of November, 2019, and should be submitted via the method outlined on the OGC Moving Features Encoding Extension – JSON request page.