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Update README-json.md

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'type' and 'tisb' need to be filled
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henry1952 2019-04-07 18:09:07 +02:00 committed by GitHub
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@ -38,19 +38,55 @@ This file contains dump1090's list of recently seen aircraft. The keys are:
* messages: the total number of Mode S messages processed since dump1090 started. * messages: the total number of Mode S messages processed since dump1090 started.
* 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. * 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.
* 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). * 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).
* squawk: the 4-digit squawk (octal representation) * type:
* flight: the flight name / callsign * flight: the flight name / callsign
* lat, lon: the aircraft position in decimal degrees * alt_baro: the aircraft barometric altitude in either feet or meters
* nucp: the NUCp (navigational uncertainty category) reported for the position * alt_geom: geometric (GNSS / INS) altitude in either feet or meters
* seen_pos: how long ago (in seconds before "now") the position was last updated * gs: ground speed in knots
* altitude: the aircraft altitude in feet, or "ground" if it is reporting it is on the ground * ias: indicated air speed in knots
* vert_rate: vertical rate in feet/minute * tas: true air speed in knots
* mach: mach number
* track: true track over ground in degrees (0-359) * track: true track over ground in degrees (0-359)
* speed: reported speed in kt. This is usually speed over ground, but might be IAS - you can't tell the difference here, sorry! * track_rate: Rate of change of track, degrees/second
* roll: Roll, degrees, negative is left roll
* mag_heading: Heading, degrees clockwise from magnetic north
* true_heading: Heading, degrees clockwise from true north
* baro_rate: Rate of change of barometric altitude, feet/minute
* geom_rate: Rate of change of geometric (GNSS / INS) altitude, feet/minute
* squawk: identity (Squawk), encoded as 4 hex digits
* emergency: provide asdditional information regarding aircraft status (2.2.3.2.7.8.1.1)
* category: emitter category to identify particular aircraft or vehicle types (values A0 - D7) (2.2.3.2.5.2)
- Set A: Light, Small, Large, High Vortex Large, High Performance, Rotorcraft
- Set B: Glider, Lighter than Air, Parachutist, Ultralight, Unmanned Areal Vehicel, Space/Transatmospheric vehicle
- Set C: Emergency Vehicle, Service Vehicle, Obstruction
- Set D: Reserved
* nav_qnh: altimeter setting (QFE or QNH/QNE), millibars
* nav_altitude: selected altitude
* nav_heading: selected heading
* nav_modes: ['autopilot', 'vnav', 'althold', 'approach', 'lnav', 'tcas']
* lat, lon: the aircraft position in decimal degrees
* nic: Navigation Integrity Category (2.2.3.2.7.2.6)
* rc: Radius of Containment in meters
* seen_pos: how long ago (in seconds before "now") the position was last updated
* version: ADS-B Version Number 0, 1, 2 (3-7 are reserved) (2.2.3.2.7.5)
* nic_baro: Navigation Integrity Category for Barometric Altitude (2.2.5.1.35)
* nac_p: Navigation Accuracy for Position (2.2.5.1.35)
* nac_v: Navigation Accuracy for Velocity (2.2.5.1.19)
* sil: Source Integity Level (2.2.5.1.40)
* sil_type: unknown, perHour, perSample
* gva: Geometric Vertical Accuracy (2.2.3.2.7.2.8)
* sda: System Design Assurance (2.2.3.2.7.2.4.6)
* mlat: list of fields based on MLAT e.g. ['lat', 'lon', 'nic', 'rc', 'nac_v']
* tisb: ??? list of fields based on TIS-B ???
* messages: total number of Mode S messages received from this aircraft * messages: total number of Mode S messages received from this aircraft
* seen: how long ago (in seconds before "now") a message was last received from this aircraft * seen: how long ago (in seconds before "now") a message was last received from this aircraft
* rssi: recent average RSSI (signal power), in dbFS; this will always be negative. * rssi: recent average RSSI (signal power), in dbFS; this will always be negative.
removed fields:
* vert_rate: vertical rate in feet/minute
* speed: reported speed in kt. This is usually speed over ground, but might be IAS - you can't tell the difference here, sorry!
* nucp: the NUCp (navigational uncertainty category) reported for the position
## history_0.json, history_1.json, ..., history_119.json ## history_0.json, history_1.json, ..., history_119.json
These files are historical copies of aircraft.json at (by default) 30 second intervals. They follow exactly the These files are historical copies of aircraft.json at (by default) 30 second intervals. They follow exactly the