AIS Events

{
    "vessel_a": {
        "mmsi": 273371330,
        "imo": 9418509,
        "name": "OMSK",
        "flag": "Russia"
    },
    "vessel_b": {
        "mmsi": 273378580,
        "imo": 9142916,
        "name": "OKEAN",
        "flag": "RUSSIA"
    },
    "min_distance_m": 7.20000000000000017763568394002504646778106689453125,
    "avg_distance_m": 39,
    "distance_consistency_m": 94,
    "duration_minutes": 120,
    "overlap_duration_s": 7201,
    "speed_a_avg": 0.05000000000000000277555756156289135105907917022705078125,
    "speed_a_std": 0.08000000000000000166533453693773481063544750213623046875,
    "speed_b_avg": 0.1700000000000000122124532708767219446599483489990234375,
    "speed_b_std": 0.38000000000000000444089209850062616169452667236328125,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0.05000000000000000277555756156289135105907917022705078125,
            "max_sog": 0.299999999999999988897769753748434595763683319091796875
        },
        "vessel_b": {
            "avg_sog": 0.1700000000000000122124532708767219446599483489990234375,
            "max_sog": 1.3000000000000000444089209850062616169452667236328125
        }
    },
    "time_window": {
        "start": "2026-09-07T23:42:42+00:00",
        "end": "2026-09-08T01:42:43+00:00"
    },
    "points_count": {
        "vessel_a": 33,
        "vessel_b": 33
    },
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "score": {
        "value": 85,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 7m, avg 39m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 120 minutes"
            },
            "speed_stability": {
                "score": 17,
                "max": 20,
                "detail": "both nearly stationary; stable speeds"
            },
            "distance_consistency": {
                "score": 8,
                "max": 15,
                "detail": "Distance variance \u00b194m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Sakhalin South Approach"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (OMSK and OKEAN) maintained close proximity (min 7m, avg 39m) for 120 minutes. Both vessels were slow-moving (avg speeds 0.1 and 0.2 knots). Moderate distance variation observed during the encounter. Event occurred in Sakhalin South Approach, a known STS activity area."
    }
}

{
    "radius_m": 2046.5,
    "duration_minutes": 159.599999999999994315658113919198513031005859375,
    "points": 45,
    "centroid": {
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        "lon": 142.75381392000002733766450546681880950927734375
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    "bbox": {
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        "min_lon": 142.730163299999986747934599407017230987548828125,
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        "max_lon": 142.756293300000010049188858829438686370849609375
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    "zone_id": "russia_sakhalin_south"
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{
    "radius_m": 1640.5,
    "duration_minutes": 170,
    "points": 60,
    "centroid": {
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        "lon": 142.64772702999999864914570935070514678955078125
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        "max_lon": 142.653285000000010995790944434702396392822265625
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    "zone_id": "russia_sakhalin_south"
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{
    "radius_m": 408.6000000000000227373675443232059478759765625,
    "duration_minutes": 194.30000000000001136868377216160297393798828125,
    "points": 51,
    "centroid": {
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        "lon": 142.646288692156844035707763396203517913818359375
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        "max_lon": 142.64721670000000131039996631443500518798828125
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    "zone_id": "russia_sakhalin_south"
}

{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 239.19999999999998863131622783839702606201171875,
    "points_in_zone": 91,
    "first_point": {
        "ts": "2026-09-07T21:50:45+00:00",
        "lat": 46.4076416999999992185621522367000579833984375,
        "lon": 142.5689032999999881212715990841388702392578125
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    "last_point": {
        "ts": "2026-09-08T01:50:00+00:00",
        "lat": 46.6278132999999996854967321269214153289794921875,
        "lon": 142.75624329999999417850631289184093475341796875
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}

{
    "vessel_a": {
        "mmsi": 273456730,
        "imo": 9084401,
        "name": "AZOV",
        "flag": "Russia"
    },
    "vessel_b": {
        "mmsi": 273439180,
        "imo": 8930744,
        "name": "ZAPRAVSHCHIK 05",
        "flag": "Russia"
    },
    "min_distance_m": 261.1000000000000227373675443232059478759765625,
    "avg_distance_m": 262.1000000000000227373675443232059478759765625,
    "distance_consistency_m": 0.5,
    "duration_minutes": 33.2999999999999971578290569595992565155029296875,
    "overlap_duration_s": 1997,
    "speed_a_avg": 0,
    "speed_a_std": 0,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0,
            "max_sog": 0
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-09-07T20:11:54+00:00",
        "end": "2026-09-07T20:45:11+00:00"
    },
    "points_count": {
        "vessel_a": 13,
        "vessel_b": 13
    },
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "score": {
        "value": 65,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 261m, avg 262m"
            },
            "duration": {
                "score": 5,
                "max": 25,
                "detail": "Duration 33 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b10m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Sakhalin South Approach"
            }
        },
        "summary": "Moderate-confidence STS candidate. Two tankers (AZOV and ZAPRAVSHCHIK 05) maintained close proximity (min 261m, avg 262m) for 33 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Sakhalin South Approach, a known STS activity area."
    },
    "sar": {
        "status": "not_found",
        "centroid": {
            "lat": 46.62457020000000085246938397176563739776611328125,
            "lon": 142.767634200000003374952939338982105255126953125
        },
        "time_window": {
            "start_ts": "2026-09-07T20:11:54+00:00",
            "end_ts": "2026-09-07T20:45:11+00:00"
        },
        "searched_at": "2026-09-07T21:15:04.330808+00:00",
        "notes": "No Sentinel-1 scenes covering AOI and time window"
    }
}

{
    "radius_m": 1024.5,
    "duration_minutes": 239.400000000000005684341886080801486968994140625,
    "points": 33,
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    "zone_id": "russia_sakhalin_south"
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{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 340.1000000000000227373675443232059478759765625,
    "points_in_zone": 94,
    "first_point": {
        "ts": "2026-09-07T20:09:35+00:00",
        "lat": 46.61974330000000321660991176031529903411865234375,
        "lon": 142.8994582999999920502887107431888580322265625
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        "ts": "2026-09-08T01:49:42+00:00",
        "lat": 46.32887170000000054415068007074296474456787109375,
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{
    "vessel_a": {
        "mmsi": 273443820,
        "imo": 8135215,
        "name": "FLAGMAN",
        "flag": "Russia"
    },
    "vessel_b": {
        "mmsi": 273439180,
        "imo": 8930744,
        "name": "ZAPRAVSHCHIK 05",
        "flag": "Russia"
    },
    "min_distance_m": 254.400000000000005684341886080801486968994140625,
    "avg_distance_m": 255.80000000000001136868377216160297393798828125,
    "distance_consistency_m": 0.90000000000000002220446049250313080847263336181640625,
    "duration_minutes": 36,
    "overlap_duration_s": 2161,
    "speed_a_avg": 0,
    "speed_a_std": 0,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0,
            "max_sog": 0
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-09-07T20:09:31+00:00",
        "end": "2026-09-07T20:45:32+00:00"
    },
    "points_count": {
        "vessel_a": 11,
        "vessel_b": 11
    },
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "score": {
        "value": 65,
        "components": {
            "distance_tightness": {
                "score": 15,
                "max": 25,
                "detail": "Min distance 254m, avg 256m"
            },
            "duration": {
                "score": 5,
                "max": 25,
                "detail": "Duration 36 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b11m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Sakhalin South Approach"
            }
        },
        "summary": "Moderate-confidence STS candidate. Two tankers (FLAGMAN and ZAPRAVSHCHIK 05) maintained close proximity (min 254m, avg 256m) for 36 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Sakhalin South Approach, a known STS activity area."
    },
    "sar": {
        "status": "not_found",
        "centroid": {
            "lat": 46.62462560000000166837708093225955963134765625,
            "lon": 142.76763199999999187639332376420497894287109375
        },
        "time_window": {
            "start_ts": "2026-09-07T20:09:31+00:00",
            "end_ts": "2026-09-07T20:45:32+00:00"
        },
        "searched_at": "2026-09-07T21:15:11.020646+00:00",
        "notes": "No Sentinel-1 scenes covering AOI and time window"
    }
}

{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 298,
    "points_in_zone": 9,
    "first_point": {
        "ts": "2026-09-07T20:08:45+00:00",
        "lat": 46.62516329999999697974999435245990753173828125,
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        "ts": "2026-09-08T01:06:46+00:00",
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{
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{
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "dwell_minutes": 346.69999999999998863131622783839702606201171875,
    "points_in_zone": 125,
    "first_point": {
        "ts": "2026-09-07T20:02:50+00:00",
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        "ts": "2026-09-08T01:49:33+00:00",
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{
    "vessel_a": {
        "mmsi": 273456730,
        "imo": 9084401,
        "name": "AZOV",
        "flag": "Russia"
    },
    "vessel_b": {
        "mmsi": 273443820,
        "imo": 8135215,
        "name": "FLAGMAN",
        "flag": "Russia"
    },
    "min_distance_m": 8.699999999999999289457264239899814128875732421875,
    "avg_distance_m": 12,
    "distance_consistency_m": 1.600000000000000088817841970012523233890533447265625,
    "duration_minutes": 341.6000000000000227373675443232059478759765625,
    "overlap_duration_s": 20495,
    "speed_a_avg": 0,
    "speed_a_std": 0,
    "speed_b_avg": 0,
    "speed_b_std": 0,
    "speed_summary": {
        "vessel_a": {
            "avg_sog": 0,
            "max_sog": 0
        },
        "vessel_b": {
            "avg_sog": 0,
            "max_sog": 0
        }
    },
    "time_window": {
        "start": "2026-09-07T20:02:50+00:00",
        "end": "2026-09-08T01:44:25+00:00"
    },
    "points_count": {
        "vessel_a": 123,
        "vessel_b": 123
    },
    "zone_id": "russia_sakhalin_south",
    "zone_name": "Sakhalin South Approach",
    "score": {
        "value": 95,
        "components": {
            "distance_tightness": {
                "score": 25,
                "max": 25,
                "detail": "Min distance 9m, avg 12m"
            },
            "duration": {
                "score": 25,
                "max": 25,
                "detail": "Duration 342 minutes"
            },
            "speed_stability": {
                "score": 20,
                "max": 20,
                "detail": "both nearly stationary; very stable speeds"
            },
            "distance_consistency": {
                "score": 15,
                "max": 15,
                "detail": "Distance variance \u00b12m"
            },
            "isolation": {
                "score": 5,
                "max": 10,
                "detail": "Isolation data not available"
            },
            "context": {
                "score": 5,
                "max": 5,
                "detail": "In monitored zone: Sakhalin South Approach"
            }
        },
        "summary": "High-confidence STS candidate. Two tankers (AZOV and FLAGMAN) maintained close proximity (min 9m, avg 12m) for 342 minutes. Both vessels were slow-moving (avg speeds 0.0 and 0.0 knots). The stable separation distance suggests deliberate parallel positioning typical of cargo transfer. Event occurred in Sakhalin South Approach, a known STS activity area."
    }
}

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