Re: [sumo-devel] Tool for manually creating O/D Matrices

[Jakob E. <nam...@go...>]

Hello,
In the application od2trips (from the sumo-suite), od-matrix cells are
represented as entities with parameters
beginTime,endTime,origin,destination (see src/od2trips/ODCell.h). These
cells are then serialized in a vector.
Your question whether to have a list of matrices (one for each time slice)
or to have one matrix with flow-over-time vectors does not strike me as
being critical. Both approaches will work. The former will make it easiert
to manipulate a single time slice and the latter will make it easier to
manipulate a single od-relation.
regards,
Jakob



2014-01-30 Andres Felipe Acosta Gil <pip...@gm...>:

> Dear SUMO community.
>
> We are interested in developing a tool to manually construct an O/D Matrix
> to generate flow definitions and consequently, the SUMO routes file.
>
> Since we are not transportation or software engineering experts, we would
> like to hear suggestions regarding the data structures and classes which
> best represent a time-variant OD Matrix. Moreover, we would like the
> matrix's elements to support the required and optional flow parameters,
> found in
> http://sumo-sim.org/userdoc/Demand/Shortest_or_Optimal_Path_Routing.html.
>
> Consider this use case story: The user has a vector, say [20 30 50 20 10],
> representing the vehicle demand in vehicles per hour. He must be able to
> provide several vectors of this kind to an OD Matrix, including the
> parameters mentioned so far.
>
> We have thought about defining a class with these parameters as attributes.
> But how to represent the time-variant behaviour? by constructing many
> instances with the same attributes except for begin, end and number? or by
> generalizing the number attribute to be a vector?.
>
> Additionally, the classes involved should be defined having a DOM structure
> into account, so that we can easily transform it to a valid xml file.
>
> Finally, recommendations about books, articles and so on are really
> appreciated.
>
> We apologise if it's already a tool with these features.
>
> Best Regards.
>
>
> --
>
> Andres Felipe Acosta Gil
>
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