{"type": "FeatureCollection", "_meta": {"__meta__": "synthetic", "disclaimer": "Synthetic demo data inspired by real Baltic geography, MMSI/OUI conventions, and infrastructure. Not real observations.", "dataset": "s2-rendezvous/sensors_used", "version": "1.0"}, "features": [{"type": "Feature", "geometry": {"type": "Point", "coordinates": [21.37, 59.779]}, "properties": {"sensorId": "MAC-UTO-COAST-01", "kind": "mac", "subtype": "coastal", "site": "Ut\u00f6", "range_km": 18, "notes": "outer-archipelago sentinel"}}, {"type": "Feature", "geometry": {"type": "Point", "coordinates": [22.955, 59.77]}, "properties": {"sensorId": "MAC-HKO-COAST-01", "kind": "mac", "subtype": "coastal", "site": "Hanko (Russar\u00f6)", "range_km": 20, "notes": "westernmost mainland"}}, {"type": "Feature", "geometry": {"type": "Point", "coordinates": [22.9701, 59.8231]}, "properties": {"sensorId": "MAC-HKO-PORT-01", "kind": "mac", "subtype": "port", "site": "Hanko port quay 4", "range_km": 1, "notes": "dense cluster"}}, {"type": "Feature", "geometry": {"type": "Point", "coordinates": [22.971, 59.8228]}, "properties": {"sensorId": "MAC-HKO-PORT-02", "kind": "mac", "subtype": "port", "site": "Hanko terminal", "range_km": 1, "notes": "dense cluster"}}, {"type": "Feature", "geometry": {"type": "Point", "coordinates": [22.9695, 59.8225]}, "properties": {"sensorId": "MAC-HKO-PORT-03", "kind": "mac", "subtype": "port", "site": "Hanko parking", "range_km": 1, "notes": "dense cluster"}}, {"type": "Feature", "geometry": {"type": "Point", "coordinates": [24.005, 59.94]}, "properties": {"sensorId": "MAC-INK-COAST-01", "kind": "mac", "subtype": "coastal", "site": "Inkoo headland", "range_km": 18, "notes": "near BalticConnector"}}, {"type": "Feature", "geometry": {"type": "Point", "coordinates": [24.38, 59.98]}, "properties": {"sensorId": "MAC-PRK-COAST-01", "kind": "mac", "subtype": "coastal", "site": "Porkkala lighthouse", "range_km": 20, "notes": "NE-bound traffic"}}, {"type": "Feature", "geometry": {"type": "Point", "coordinates": [24.385, 59.971]}, "properties": {"sensorId": "MAC-PRK-COAST-02", "kind": "mac", "subtype": "coastal", "site": "Porkkala south", "range_km": 15, "notes": "secondary"}}, {"type": "Feature", "geometry": {"type": "Point", "coordinates": [24.9182, 60.1532]}, "properties": {"sensorId": "MAC-HEL-PORT-01", "kind": "mac", "subtype": "port", "site": "Helsinki West Harbour LJ-gate", "range_km": 1, "notes": "dense cluster"}}, {"type": "Feature", "geometry": {"type": "Point", "coordinates": [24.9178, 60.1535]}, "properties": {"sensorId": "MAC-HEL-PORT-02", "kind": "mac", "subtype": "port", "site": "Helsinki West Harbour walkway", "range_km": 1, "notes": "dense"}}, {"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": [22.978, 59.82]}, "properties": {"sensorId": "RAD-COAST-HKO-01", "kind": "radar", "subtype": "coastal", "site": "Hanko coastal radar", "range_nm": 18}}, {"type": "Feature", "geometry": {"type": "Point", "coordinates": [24.952, 60.152]}, "properties": {"sensorId": "RAD-COAST-HEL-01", "kind": "radar", "subtype": "coastal", "site": "Helsinki coastal radar", "range_nm": 22}}, {"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}}]}