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Some corrections to json doc updates

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Oliver Jowett 2019-05-02 22:15:32 +08:00
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README-json.md
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@ -37,16 +37,23 @@ This file contains dump1090's list of recently seen aircraft. The keys are:
* now: the time this file was generated, in seconds since Jan 1 1970 00:00:00 GMT (the Unix epoch). * now: the time this file was generated, in seconds since Jan 1 1970 00:00:00 GMT (the Unix epoch).
* 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. * 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).
The identifier may start with '~', this means that the address is a non-ICAO address (e.g. from TIS-B). * type: type of underlying message, one of:
* type: type of the modeS address e.g. ADS-B, ADR-R, TIS-B * adsb_icao: messages from a Mode S or ADS-B transponder, using a 24-bit ICAO address
* adsb_icao_nt: messages from an ADS-B equipped "non-transponder" emitter e.g. a ground vehicle, using a 24-bit ICAO address
* adsr_icao: rebroadcast of ADS-B messages originally sent via another data link e.g. UAT, using a 24-bit ICAO address
* 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
* adsb_other: messages from an ADS-B transponder using a non-ICAO address, e.g. anonymized address
* adsr_other: rebroadcast of ADS-B messages originally sent via another data link e.g. UAT, using a non-ICAO address
* tisb_other: traffic information about a non-ADS-B target using a non-ICAO address
* tisb_trackfile: traffic information about a non-ADS-B target using a track/file identifier, typically from primary or Mode A/C radar
* flight: callsign, the flight name or aircraft registration as 8 chars (2.2.8.2.6) * flight: callsign, the flight name or aircraft registration as 8 chars (2.2.8.2.6)
* alt_baro: the aircraft barometric altitude in either feet or meters * alt_baro: the aircraft barometric altitude in feet
* alt_geom: geometric (GNSS / INS) altitude in either feet or meters * alt_geom: geometric (GNSS / INS) altitude in feet referenced to the WGS84 ellipsoid
* gs: ground speed in knots * gs: ground speed in knots
* ias: indicated air speed in knots * ias: indicated air speed in knots
* tas: true air speed in knots * tas: true air speed in knots
* mach: mach number * mach: Mach number
* track: true track over ground in degrees (0-359) * track: true track over ground in degrees (0-359)
* track_rate: Rate of change of track, degrees/second * track_rate: Rate of change of track, degrees/second
* roll: Roll, degrees, negative is left roll * roll: Roll, degrees, negative is left roll
@ -54,45 +61,32 @@ This file contains dump1090's list of recently seen aircraft. The keys are:
* true_heading: Heading, degrees clockwise from true north * true_heading: Heading, degrees clockwise from true north
* baro_rate: Rate of change of barometric altitude, feet/minute * baro_rate: Rate of change of barometric altitude, feet/minute
* geom_rate: Rate of change of geometric (GNSS / INS) altitude, feet/minute * geom_rate: Rate of change of geometric (GNSS / INS) altitude, feet/minute
* squawk: Mode A code (Squawk), encoded as 4 octal digits, useful for ADS-B report correlation with SSR data * squawk: Mode A code (Squawk), encoded as 4 octal digits
* emergency: provide asdditional information regarding aircraft status (2.2.3.2.7.8.1.1) * emergency: ADS-B emergency/priority status, a superset of the 7x00 squawks (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) * category: emitter category to identify particular aircraft or vehicle classes (values A0 - D7) (2.2.3.2.5.2)
- Set A: * nav_qnh: altimeter setting (QFE or QNH/QNE), hPa
1 Light, 2 Small, 3 Large, 4 High Vortex Large, 5 Heavy, 6 High Performance, 7 Rotorcraft
- Set B:
1 Glider,2 Lighter than Air, 3 Parachutist, 4 Ultralight, 6 Unmanned Areal Vehicel, 7 Space/Transatmospheric vehicle
- Set C:
1 Emergency Vehicle, 2 Service Vehicle, 3..5 Obstruction
- Set D: Reserved
* nav_qnh: altimeter setting (QFE or QNH/QNE), millibars
* nav_altitude: selected altitude * nav_altitude: selected altitude
* nav_heading: selected heading * nav_heading: selected heading
* nav_modes: target state and status with 'autopilot', 'vnav', 'althold', 'approach', 'lnav', 'tcas' * nav_modes: set of engaged automation modes: 'autopilot', 'vnav', 'althold', 'approach', 'lnav', 'tcas'
* lat, lon: the aircraft position in decimal degrees * lat, lon: the aircraft position in decimal degrees
* nic: Navigation Integrity Category (2.2.3.2.7.2.6) * nic: Navigation Integrity Category (2.2.3.2.7.2.6)
* rc: Radius of Containment, (Rc) * 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)
is the radius that there is a 95% probability the aircraft is within that radius of its stated position,
both horizontally and vertically.
* seen_pos: how long ago (in seconds before "now") the position was last updated * 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) * 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) * 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_p: Navigation Accuracy for Position (2.2.5.1.35)
* nac_v: Navigation Accuracy for Velocity (2.2.5.1.19) * nac_v: Navigation Accuracy for Velocity (2.2.5.1.19)
* sil: Source Integity Level (2.2.5.1.40) * sil: Source Integity Level (2.2.5.1.40)
probability of the reported horizontal position exceeding the radius of containment defined by the NIC * sil_type: interpretation of SIL: unknown, perhour, persample
* sil_type: unknown, perHour, perSample
* gva: Geometric Vertical Accuracy (2.2.3.2.7.2.8) * gva: Geometric Vertical Accuracy (2.2.3.2.7.2.8)
* sda: System Design Assurance (2.2.3.2.7.2.4.6) * 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' * mlat: list of fields derived from MLAT data
* tisb: ??? list of fields based on TIS-B ??? * tisb: list of fields derived from TIS-B data
* 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: Section references (2.2.xyz) refer to DO-260B.
* 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