Decide geometry encoding for borehole trajectory (BH_Trajectory)

Determine whether the BH_Trajectory geometry in the conceptual borehole model should be encoded as a 3D LineString or using local polar coordinates, and specify the standard-compliant representation to integrate with ISO 19148 linear referencing and ISO 19156 Observations, Measurements, and Samples.

Background

Within the conceptual borehole model, BH_Trajectory represents the spatial path of a borehole and underpins the integration of linear referencing (ISO 19148) with observations and sampling (ISO 19156). The report explicitly notes uncertainty about how to encode this trajectory geometry.

Resolving this choice is important for consistent implementation across OGC SensorThings API-based services and related standards, impacting how observations are linearly referenced along boreholes and how geometries are exchanged and processed.

References

BH_Trajectory: The trajectory of the borehole. Encoding of the Geometry TBD, as unclear if we use a 3D Linestring or local polar coordinates.

— OGC Geotech Interoperability Experiment Engineering Report  (2512.10678 - Beaufils et al., 11 Dec 2025) in Section 4.3.3, Conceptual Borehole Model (BH_Trajectory)