The global position provides information about the latitude, longitude and optionally the elevation of a position, according to a coordinate reference system for the latitude and longitude, and an elevation reference for the elevation. The coordinate reference system can for example be EPSG:4326 as used by GPS. The elevation reference is typically relative to a floor level.
In order to provide the global position, the GlobalPositionType VariableType is used (see 8.1). In Figure 6, the GlobalPositionType is shown, providing the main information as value (in the GlobalPositionDataType) as well as subvariables for individual access, and additional information like the coordinate reference system. The SourceId Variable provides the identifier indicating which tracking system or device generated the position data.
The SourceId Variable plays a critical role in this context by identifying the origin of the position data. It represents a unique identifier that indicates which tracking system or self-localizing device generated the location information. This identifier may correspond to a zone or foreign identifier associated with a real-time location system, or it may denote the unique identifier of a device capable of self-localization (for example, a UWB (Ultra-Wideband) tag operating in GPS mode).
