Hello,
there is currently no function to generated a landmark table.
You need to pick the landmarks yourself and create a file with one landmark
per line. (10-20, mostly placed at the outer rim of the network seems to
work well).
The distances can then be generated automatically.
("A lookup table can be generated by creating a file with one landmark edge
id per line (e.g. landmarks.txt) and then setting the options
*-astar.landmark-distances
landmarks.txt --astar.save-landmark-distances lookuptable.txt")*
There are publications out there that describe landmark selection
algorithms but we didn't have the time/need to implement them yet. Code
contributions are welcome.
regards,
Jakob
Am Di., 4. Mai 2021 um 05:43 Uhr schrieb g2121044 <[email protected]>:
> Hello
>
> I have a question about the astar algorithm.
> In the reference it says that I can generate lookuptable data based on
> landmark data and use it for astar.
> https://sumo.dlr.de/docs/Simulation/Routing.html#routing_algorithms
> https://www.eclipse.org/lists/sumo-user/msg05065.html
>
> Do I have to create this landmark data by myself?
> Is there a function to generate it automatically from net.xml?
> Sorry to bother you again.
>
> Best regard,
> Nishikawa
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