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I need a routing service with an API callable from a web or desktop application.
I have several points: a start, an end, and intermediate points in the disorder. I expect the routing service to send me the shortest path between the start and the end, via every intermediate point.
Do you know such a service ?
I've written a routing script for QGIS Processing based on the core network analysis library. It expects a point layer and a network layer as input and returns a route between the points. To add the interactive aspect you describe, you'll have to extend the code.
Actually you can use two tools, both are easy to install on your own server.
Best Answer
OSRM has an routing API that can do that. You can find the documentation for the API here. But you have to put them in the order of appearance beforehand.
To route via certain coordinates list them in the query string in the order of appearance (currently limited to 25 max points and to vehicle routing only):
Please have a look at the API Usage Policy before you use it.