{"type": "FeatureCollection", "_meta": {"__meta__": "synthetic", "disclaimer": "Synthetic demo data inspired by real Baltic geography, MMSI/OUI conventions, and infrastructure. Not real observations.", "dataset": "s1-ais-dark-near-cable/infrastructure_used", "version": "1.0"}, "features": [{"type": "Feature", "properties": {"featureId": "estlink-1", "kind": "cable", "name": "Estlink 1", "note": "HVDC submarine cable, synthetic alignment Helsinki-Tallinn"}, "geometry": {"type": "LineString", "coordinates": [[24.91, 60.24], [24.85, 59.85], [24.8, 59.48]]}}, {"type": "Feature", "properties": {"featureId": "estlink-1-buffer", "kind": "cable_buffer", "name": "Estlink 1 500m buffer", "parent": "estlink-1"}, "geometry": {"type": "Polygon", "coordinates": [[[24.91, 60.24], [24.915, 60.24], [24.805, 59.48], [24.795, 59.48], [24.91, 60.24]]]}}, {"type": "Feature", "properties": {"featureId": "estlink-2", "kind": "cable", "name": "Estlink 2", "note": "HVDC submarine cable, synthetic alignment parallel to Estlink 1"}, "geometry": {"type": "LineString", "coordinates": [[24.93, 60.24], [24.87, 59.85], [24.82, 59.48]]}}, {"type": "Feature", "properties": {"featureId": "estlink-2-buffer", "kind": "cable_buffer", "name": "Estlink 2 500m buffer", "parent": "estlink-2"}, "geometry": {"type": "Polygon", "coordinates": [[[24.93, 60.24], [24.935, 60.24], [24.825, 59.48], [24.815, 59.48], [24.93, 60.24]]]}}, {"type": "Feature", "properties": {"featureId": "finnish-eez-gof", "kind": "eez", "name": "Finnish EEZ (Gulf of Finland clip)"}, "geometry": {"type": "Polygon", "coordinates": [[[22.0, 59.5], [28.0, 59.5], [28.0, 60.6], [22.0, 60.6], [22.0, 59.5]]]}}]}