Some corrections to json doc updates
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Oliver Jowett
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@ -37,16 +37,23 @@ This file contains dump1090's list of recently seen aircraft. The keys are:
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* now: the time this file was generated, in seconds since Jan 1 1970 00:00:00 GMT (the Unix epoch).
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* messages: the total number of Mode S messages processed since dump1090 started.
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* aircraft: an array of JSON objects, one per known aircraft. Each aircraft has the following keys. Keys will be omitted if data is not available.
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* hex: the 24-bit ICAO identifier of the aircraft, as 6 hex digits.
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The identifier may start with '~', this means that the address is a non-ICAO address (e.g. from TIS-B).
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* type: type of the modeS address e.g. ADS-B, ADR-R, TIS-B
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* hex: the 24-bit ICAO identifier of the aircraft, as 6 hex digits. The identifier may start with '~', this means that the address is a non-ICAO address (e.g. from TIS-B).
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* type: type of underlying message, one of:
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* adsb_icao: messages from a Mode S or ADS-B transponder, using a 24-bit ICAO address
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* adsb_icao_nt: messages from an ADS-B equipped "non-transponder" emitter e.g. a ground vehicle, using a 24-bit ICAO address
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* adsr_icao: rebroadcast of ADS-B messages originally sent via another data link e.g. UAT, using a 24-bit ICAO address
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* tisb_icao: traffic information about a non-ADS-B target identified by a 24-bit ICAO address, e.g. a Mode S target tracked by secondary radar
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* adsb_other: messages from an ADS-B transponder using a non-ICAO address, e.g. anonymized address
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* adsr_other: rebroadcast of ADS-B messages originally sent via another data link e.g. UAT, using a non-ICAO address
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* tisb_other: traffic information about a non-ADS-B target using a non-ICAO address
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* tisb_trackfile: traffic information about a non-ADS-B target using a track/file identifier, typically from primary or Mode A/C radar
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* flight: callsign, the flight name or aircraft registration as 8 chars (2.2.8.2.6)
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* alt_baro: the aircraft barometric altitude in either feet or meters
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* alt_geom: geometric (GNSS / INS) altitude in either feet or meters
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* alt_baro: the aircraft barometric altitude in feet
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* alt_geom: geometric (GNSS / INS) altitude in feet referenced to the WGS84 ellipsoid
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* gs: ground speed in knots
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* ias: indicated air speed in knots
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* tas: true air speed in knots
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* mach: mach number
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* mach: Mach number
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* track: true track over ground in degrees (0-359)
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* track_rate: Rate of change of track, degrees/second
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* roll: Roll, degrees, negative is left roll
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@ -54,45 +61,32 @@ This file contains dump1090's list of recently seen aircraft. The keys are:
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* true_heading: Heading, degrees clockwise from true north
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* baro_rate: Rate of change of barometric altitude, feet/minute
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* geom_rate: Rate of change of geometric (GNSS / INS) altitude, feet/minute
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* squawk: Mode A code (Squawk), encoded as 4 octal digits, useful for ADS-B report correlation with SSR data
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* emergency: provide asdditional information regarding aircraft status (2.2.3.2.7.8.1.1)
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* category: emitter category to identify particular aircraft or vehicle types (values A0 - D7) (2.2.3.2.5.2)
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- Set A:
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1 Light, 2 Small, 3 Large, 4 High Vortex Large, 5 Heavy, 6 High Performance, 7 Rotorcraft
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- Set B:
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1 Glider,2 Lighter than Air, 3 Parachutist, 4 Ultralight, 6 Unmanned Areal Vehicel, 7 Space/Transatmospheric vehicle
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- Set C:
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1 Emergency Vehicle, 2 Service Vehicle, 3..5 Obstruction
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- Set D: Reserved
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* nav_qnh: altimeter setting (QFE or QNH/QNE), millibars
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* squawk: Mode A code (Squawk), encoded as 4 octal digits
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* emergency: ADS-B emergency/priority status, a superset of the 7x00 squawks (2.2.3.2.7.8.1.1)
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* category: emitter category to identify particular aircraft or vehicle classes (values A0 - D7) (2.2.3.2.5.2)
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* nav_qnh: altimeter setting (QFE or QNH/QNE), hPa
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* nav_altitude: selected altitude
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* nav_heading: selected heading
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* nav_modes: target state and status with 'autopilot', 'vnav', 'althold', 'approach', 'lnav', 'tcas'
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* nav_modes: set of engaged automation modes: 'autopilot', 'vnav', 'althold', 'approach', 'lnav', 'tcas'
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* lat, lon: the aircraft position in decimal degrees
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* nic: Navigation Integrity Category (2.2.3.2.7.2.6)
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* rc: Radius of Containment, (Rc)
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is the radius that there is a 95% probability the aircraft is within that radius of its stated position,
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both horizontally and vertically.
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* rc: Radius of Containment, meters; a measure of position integrity derived from NIC & supplementary bits. (2.2.3.2.7.2.6, Table 2-69)
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* seen_pos: how long ago (in seconds before "now") the position was last updated
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* version: ADS-B Version Number 0, 1, 2 (3-7 are reserved) (2.2.3.2.7.5)
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* nic_baro: Navigation Integrity Category for Barometric Altitude (2.2.5.1.35)
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* nac_p: Navigation Accuracy for Position (2.2.5.1.35)
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* nac_v: Navigation Accuracy for Velocity (2.2.5.1.19)
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* sil: Source Integity Level (2.2.5.1.40)
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probability of the reported horizontal position exceeding the radius of containment defined by the NIC
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* sil_type: unknown, perHour, perSample
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* sil_type: interpretation of SIL: unknown, perhour, persample
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* gva: Geometric Vertical Accuracy (2.2.3.2.7.2.8)
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* sda: System Design Assurance (2.2.3.2.7.2.4.6)
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* mlat: list of fields based on MLAT e.g. 'lat', 'lon', 'nic', 'rc', 'nac_v'
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* tisb: ??? list of fields based on TIS-B ???
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* mlat: list of fields derived from MLAT data
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* tisb: list of fields derived from TIS-B data
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* messages: total number of Mode S messages received from this aircraft
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* seen: how long ago (in seconds before "now") a message was last received from this aircraft
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* rssi: recent average RSSI (signal power), in dbFS; this will always be negative.
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removed fields:
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* vert_rate: vertical rate in feet/minute
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* speed: reported speed in kt. This is usually speed over ground, but might be IAS - you can't tell the difference here, sorry!
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* nucp: the NUCp (navigational uncertainty category) reported for the position
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Section references (2.2.xyz) refer to DO-260B.
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## history_0.json, history_1.json, ..., history_119.json
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