New answers tagged routing
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Ok, I obtained the speed settings per road class by a linear optimization.
Obtain the path length for which the travel time was measured.
This can be done by pgrouting and QGIS. First route the shortest path or manually draw it, then export the path with its road classes to excel.
Within Excel use a Pivot table to extract the sum per road type and route.
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Regarding your question: "how can i convert an osm database into a graph data", you can also use osm2po. Among other things, it will create a postgreSQL input file from raw OSM. OSM road networks are not routable in the basic form: there are some junctions/intersections that need attention and the road speeds need to be determined from the given road ...
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osm2po does not simplify the underlying OSM-data. And in my opinion it is not necessary. Your problem only refers to very long roads which are rather rare. Usually even long roads may change between source and target; think of speed limits, grades, pavements. There are tons of attributes which split an obviously complete way into sections. And if there are ...
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The most obvious approach I can see for this problem is to first determine the legal speed limits for all roads in the area of interest. Then using the travel time measurements, see how much longer than the theoretical minimum travel time the actual times are. Could be as simple as a factor which is applied to reduce the max speed. The factor could be ...
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