Tutorials/Trace File Generation
This tutorial describes how to generate vehicular trace files. Besides SUMO, the Tools/TraceExporter will be used. It requires Python to be executed and currently allows to generate trace files for ns2/ns3, Shawn, OMNET, and PHEM.
For generating vehicular traces, You need a simulation scenario, consisting at least of a road network and routes. You may visit Tutorials/Hello Sumo, Tutorials/quick start or Tutorials/Quick Start old style to learn how to get a scenario.
Generating a SUMO-trace
We assume You have the scenario and a configuration file named "myConfig.sumocfg". It may have a different name, of course. You should be able to start SUMO using Your configuration like this:
sumo -c myConfig.sumocfg
Now, we use the simulation to get an fcd output, a trace file in a SUMO-format. This file will be later converted into a trace file for one of the applications supported by Tools/TraceExporter. We generate an fcd output as following:
sumo -c myConfig.sumocfg --fcd-output sumoTrace.xml
And we will obtain the file "sumoTrace.xml".
Converting the Trace
We can now convert the vehicular traces in SUMO format into another format. For now, let's assume You would like to have a ns2 mobility file. We can generate one from the obtained fcd output using:
traceExporter.py --fcd-input sumoTrace.xml --ns2mobility-output ns2mobility.tcl
We obtain the file "ns2mobility.tcl", which we can give ns2 as input.
Tools/TraceExporter generates files for ns2/ns3, OMNET, Shawn, and PHEM. Please visit the Tools/TraceExporter manual page for further information about how to generate these files. Look for "output options".
Different Penetration Rates
Tools/TraceExporter allows to define different equipment / penetration rates using the --penetration <FLOAT>. <FLOAT> will be the amount of vehicles that are exported, where 1 is equal to 100 %. This means, if You want to have 10 % of vehicles to show up in Your ns2-trace, use:
traceExporter.py --penetration 0.1 \ --fcd-input sumoTrace.xml --ns2-mobilityoutput ns2mobility.tcl
The --seed <FLOAT> allows You to give different random number initialisations for choosing the vehicles to export.
Limiting the Time
Additionally, You may force Tools/TraceExporter to convert only every nth time step using the option --delta <TIME>. Please note that the value should be a multiple of the time step length used within the simulation.