> Hi, I have question about the new vClasses "aircraft".
Are there plans to add air traffic? Or what it is generally good for?
I've used sumo to model airports and some drone activities (just out of
interest) - my observations:
a) Modelling airport ground movements and multi-modal traffic (passenger, bus,
rail, cargo, catering, etc) works well today, with the caveat that aircraft
tug/pushback behaviour isn't really practical - you can do it at airports with
small numbers of stands but at larger airports it's just too messy.
b) if you're not using traci to behave as ground control/tower control
modelling spaced takeoff/landing needs some fudging and won't be correct.
c)it works because in larger airfields ground movements of all traffic,
including aircraft, follow strict routes, even across the apron - so you can
set up roads/railways mapping these routes. Modelling smaller fields with free
movement across the apron won't work.
d) passenger loading/unloading times on transit buses/tube lines/aircraft has
to be set to unrealistic values because load/unload is at a single point. I
haven't yet tried the doors features of v20 that may fix this.
e) I looked at airway modelling and decided it wasn't really sensible/could not
envisage a use case that would model anything that excel wouldn't:
i) distances are huge relative to road distances - meaning you have a long
duration simulation for a single vehicle travelling hundreds of miles
ii) airway transit is about changing flight level - you need to handle this to
get climb/descent timings right
iii) using the gui, even just to check behaviour, simply doesn't work on this
scale.
f) if you assume that eventually drones will be subject to similar airway
restrictions as aircraft to avoid collisions then it should be feasible to
model them using sumo vehicles - because the range of 'flight levels' available
and distances travelled will be relatively small.
g) if you assume that drone traffic will be uncontrolled and reliant on
collision avoidance, then using sumo vehicles won't be practical because drones
will try to travel in straight lines between launch and destination. (ie there
won't be a road network)
h) I have had reasonable success modelling this latter style of drone behaviour
using a sumo poi to model a drone and traci to manage flight.
Cheers
Div
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