The document discusses using spatial data streams in real-time applications. It describes different types of real-time spatial data, such as stationary data from sensors and dynamic data from moving objects. It then demonstrates the ArcGIS GeoEvent Extension for Server, which can integrate real-time streaming data, perform continuous processing and analytics, and respond to events in real-time by updating maps and sending alerts. The extension includes connectors to ingest data streams and output connectors to respond to events. Filters and processors can be used to analyze incoming data.