[R-sig-Geo] [FORGED] Create a Spatial Weight Matrix based on road distance

[Timothée Giraud]

Dear Rolando,

OSRM (Open Source Routing Machine) is a routing engine designed to run 
on OpenStreetMap data.

There is a public instance of the engine, a demo server. This server 
has limitations 
(https://github.com/Project-OSRM/osrm-backend/wiki/Demo-server) like 
the number of requests/minute, or in your case the maximum size of a 
requested distance matrix (10000, meaning 100 origines x 100 
destinations).  As they say :"he demo server usage is restricted to 
reasonable, non-commercial use-cases. We provide no guarantees wrt. 
uptime, latency, or data updates."

A solution is to run your own instance of the server to get rid of 
these limitations. The prefered and simplest way to run an instance is 
to use a Docker container 
(https://github.com/Project-OSRM/osrm-backend#quick-start).
When launching the Docker you'll have to set a large value for the 
--max-table-size parameter. Something like:
docker run -t -i -p 5000:5000 -v "${PWD}:/data" osrm/osrm-backend 
osrm-routed --algorithm mld --max-table-size 9000000 
/data/berlin-latest.osrm

The osrm R package is an interface between R and OSRM. The default 
server used by the package is the OSRM demo server. But you can change 
the default server with :
options(osrm.server = "http://0.0.0.0:5000/", osrm.profile = "driving")

Cheers,

Timothée



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