ais-gaps.json

[
    {
        "mode": "REQUIRED",
        "name": "gap_id",
        "type": "STRING",
        "description": "Gap ID (MD5 hash of [ssvid, start_timestamp, start_lat, start_lon])."
    },
    {
        "mode": "REQUIRED",
        "name": "ssvid",
        "type": "STRING",
        "description": "The ssvid of the gap."
    },
    {
        "mode": "REQUIRED",
        "name": "version",
        "type": "TIMESTAMP",
        "description": "Timestamp of the gap version, to be used for retrieving the most recent version of a gap."
    },
    {
        "mode": "REQUIRED",
        "name": "positions_hours_before",
        "type": "INTEGER",
        "description": "Number of positions N hours before the gap start (see table details)."
    },
    {
        "mode": "REQUIRED",
        "name": "positions_hours_before_ter",
        "type": "INTEGER",
        "description": "Number of terrestrial positions N hours before the gap start (see table details)."
    },
    {
        "mode": "REQUIRED",
        "name": "positions_hours_before_sat",
        "type": "INTEGER",
        "description": "Number of satellite positions N hours before the gap start (see table details)."
    },
    {
        "mode": "REQUIRED",
        "name": "positions_hours_before_dyn",
        "type": "INTEGER",
        "description": "Number of dynamic positions N hours before the gap start (see table details)."
    },
    {
        "mode": "NULLABLE",
        "name": "distance_m",
        "type": "FLOAT",
        "description": "Distance (in meters) between start and end positions."
    },
    {
        "mode": "NULLABLE",
        "name": "duration_h",
        "type": "FLOAT",
        "description": "Length of the gap (in hours)."
    },
    {
        "mode": "NULLABLE",
        "name": "implied_speed_knots",
        "type": "FLOAT",
        "description": "Implied speed during the gap based on duration_h and distance_m."
    },
    {
        "mode": "REQUIRED",
        "name": "start_timestamp",
        "type": "TIMESTAMP",
        "description": "The timestamp of the position at the beginning of the gap."
    },
    {
        "mode": "REQUIRED",
        "name": "start_msgid",
        "type": "STRING",
        "description": "Message ID of last position message before start of gap."
    },
    {
        "mode": "REQUIRED",
        "name": "start_seg_id",
        "type": "STRING",
        "description": "Segment ID of last position message before start of gap."
    },
    {
        "mode": "NULLABLE",
        "name": "start_lat",
        "type": "FLOAT",
        "description": "Latitude at start of gap."
    },
    {
        "mode": "NULLABLE",
        "name": "start_lon",
        "type": "FLOAT",
        "description": "Longitude at start of gap."
    },
    {
        "mode": "NULLABLE",
        "name": "start_ais_class",
        "type": "STRING",
        "description": "AIS device class at start of gap."
    },
    {
        "mode": "NULLABLE",
        "name": "start_receiver_type",
        "type": "STRING",
        "description": "Receiver type at start of gap."
    },
    {
        "mode": "NULLABLE",
        "name": "start_distance_from_shore_m",
        "type": "FLOAT",
        "description": "Distance from shore (meters) at start of gap (using rasterized distance)."
    },
    {
        "mode": "NULLABLE",
        "name": "start_distance_from_port_m",
        "type": "FLOAT",
        "description": "Distance from nearest port (meters) at start of gap (using rasterized distance)."
    },
    {
        "mode": "NULLABLE",
        "name": "end_timestamp",
        "type": "TIMESTAMP",
        "description": "The timestamp of the position at the end of the gap."
    },
    {
        "mode": "NULLABLE",
        "name": "end_msgid",
        "type": "STRING",
        "description": "Message ID of first position message after end of gap."
    },
    {
        "mode": "NULLABLE",
        "name": "end_seg_id",
        "type": "STRING",
        "description": "Segment ID of first position message after end of gap."
    },
    {
        "mode": "NULLABLE",
        "name": "end_lat",
        "type": "FLOAT",
        "description": "Latitude at end of gap."
    },
    {
        "mode": "NULLABLE",
        "name": "end_lon",
        "type": "FLOAT",
        "description": "Longitude at end of gap."
    },
    {
        "mode": "NULLABLE",
        "name": "end_ais_class",
        "type": "STRING",
        "description": "AIS device class at end of gap."
    },
    {
        "mode": "NULLABLE",
        "name": "end_receiver_type",
        "type": "STRING",
        "description": "Receiver type at end of gap."
    },
    {
        "mode": "NULLABLE",
        "name": "end_distance_from_shore_m",
        "type": "FLOAT",
        "description": "Distance from shore (meters) at end of gap (using rasterized distance)."
    },
    {
        "mode": "NULLABLE",
        "name": "end_distance_from_port_m",
        "type": "FLOAT",
        "description": "Distance from nearest port (meters) at end of gap (using rasterized distance)."
    },
    {
        "mode": "REQUIRED",
        "name": "is_closed",
        "type": "BOOLEAN",
        "description": "Whether or not the gap is closed."
    }
]