Sensor fusion¶
Sentinel-1 intensity¶
The primary detector fits a seasonal baseline to VV/VH backscatter and looks for durable positive residuals.
Sentinel-1 coherence¶
senbygg_coh.py uses yearly July-August coherence composites. A new hard target can produce a sustained coherence rise relative to vegetated or decorrelating baseline surfaces. Coherence is the strongest optional recall lever in current validation, but requires burst/track-aware preprocessing.
Sentinel-2 optical indices¶
senbygg_s2.py checks annual summer composites for:
It is useful as confirmation but cloud/season dependent.
Final fusion¶
The runner uses OR-style fusion for review prioritization: any supported signal can raise flagged = true, while source records which signal(s) fired. Treat multi-sensor agreement as higher confidence.