{"type": "FeatureCollection", "_meta": {"__meta__": "synthetic", "disclaimer": "Synthetic demo data inspired by real Baltic geography, MMSI/OUI conventions, and infrastructure. Not real observations.", "dataset": "s6-drone-swarm/sensors_used", "version": "1.0"}, "features": [{"type": "Feature", "geometry": {"type": "Point", "coordinates": [24.988, 60.145]}, "properties": {"sensorId": "MAC-HEL-COAST-01", "kind": "mac", "subtype": "coastal", "site": "Helsinki Suomenlinna", "range_km": 15, "notes": "low-elevation mast"}}, {"type": "Feature", "geometry": {"type": "Point", "coordinates": [25.63, 60.205]}, "properties": {"sensorId": "MAC-PRV-COAST-01", "kind": "mac", "subtype": "coastal", "site": "Porvoo Em\u00e4salo", "range_km": 18, "notes": "south-tip island mast"}}, {"type": "Feature", "geometry": {"type": "Point", "coordinates": [25.93, 60.19]}, "properties": {"sensorId": "MAC-PRV-COAST-02", "kind": "mac", "subtype": "coastal", "site": "Porvoo Kilpilahti approach", "range_km": 15, "notes": "near industrial port"}}, {"type": "Feature", "geometry": {"type": "Point", "coordinates": [24.95, 60.3]}, "properties": {"sensorId": "MAC-AIR-PLN-01", "kind": "mac", "subtype": "airborne", "site": "mobile (on RAD-PLN-01 Dornier 228-class)", "range_km": 30, "notes": "airborne; location_geom is start-of-day placeholder"}}, {"type": "Feature", "geometry": {"type": "Point", "coordinates": [24.95, 60.3]}, "properties": {"sensorId": "MAC-AIR-DRN-01", "kind": "mac", "subtype": "airborne", "site": "mobile (on RAD-DRN-PAT-01 patrol drone)", "range_km": 5, "notes": "airborne; location_geom is launch-base placeholder"}}, {"type": "Feature", "geometry": {"type": "Point", "coordinates": [25.0, 60.35]}, "properties": {"sensorId": "RAD-PLN-01", "kind": "radar", "subtype": "plane", "site": "mobile patrol aircraft (Dornier 228-class)", "sweep_s": 4}}, {"type": "Feature", "geometry": {"type": "Point", "coordinates": [24.95, 60.25]}, "properties": {"sensorId": "RAD-DRN-PAT-01", "kind": "radar", "subtype": "drone", "site": "mobile patrol drone", "sweep_s": 1}}]}