traffic

The Traffic object

In BlueSky, the traffic object contains all of the data related to the actual simulation of the traffic. This data can be aircraft-related (e.g., aircraft positions, velocities, etc.), but also other simulated aspects affecting the aircraft such as weather (a wind model, turbulence). In BlueSky, the traffic as whole is an object, but the properties are represented by numpy vectors to allow vectorizing. To find out more about this, look here.

There are traf.ntraf aircraft. For given aircraft id, the index can be found with the function: traf.id2idx(txt).

Part of this traffic object are also system simulations like the airborne separation assurance system (ASAS, in traf.asas), the autopilot (in traf.ap) and the flight management system (FMS, in traf.ap.route and traf.actwp for the active waypoint data).

The traffic object is accessible as a top-level import from bluesky:

from bluesky import traf

# Do stuff with traf
i = traf.id2idx("KL204")
print(traf.lat[i])
...

Traffic members

The following data are available in the traffic object:

Basic aircraft information

Name	Unit	Description
id	string	Aircraft callsign
type	string	Aircaft type

Aircraft location and orientation

Name	Unit	Description
lat	deg	Aircraft latitude
lon	deg	Aircraft longitude
alt	m	Aircraft altitude
hdg	deg	Aircraft heading
trk	deg	Aircraft track angle

Aircraft velocities

Name	Unit	Description
tas	m/s	Aircraft true airspeed
gs	m/s	Aircraft ground speed
gsnorth	m/s	Aircraft ground speed
gseast	m/s	Aircraft ground speed
cas	m/s	Aircraft calibrated airspeed
M	-	Aircraft mach number
vs	m/s	Aircraft vertical speed

Atmospheric properties per aircraft

Name	Unit	Description
p	N/m2	Air pressure
rho	kg/m3	Air density
Temp	K	Air temperature
dtemp	K	Delta-t for non-ISA conditions

Aircraft autopilot settings

Name	Unit	Description
aspd	m/s	Aircraft selected speed (CAS)
ama	-	Aircraft selected speed above crossover altitude (Mach)
apalt	m	Aircraft selected altitude
avs	m/s	Aircraft selected vertical speed