[OHM] Routing with OHM data (BA 1870)

[SK53]

Following on from our conversation during last week's hangout, I've made a
first test of using some OHM data for routing.

I decided to use Graphhopper as this means one can route with several
different transport modes with one model (faster engines, such as OSRM use
contraction hierarchies which means only a single set of weights is applied
to edges of the routing graph).

After a fair bit of fiddling about with my java settings, I got graphhopper
to run its default data set (Berlin OSM data). After that it was
straightforward to replace the Berlin data with OHM data (my Buenos Aires
1870) and re-build the routing model.

Testing it in the default graphhopper web app enables routing fine
<https://www.flickr.com/photos/sk53_osm/15931690010/>.

The current issues with this approach are:

   - Web app does not show OHM data
   - I  cant seem to click on the map for locations, and have to use search.
   - Search returns data from modern locations (hence the pin outside the
   built-up area of the city).
   - I only have car routing (may just be running graphhopper with defaults)
   - It needs 1870 style options & weighting.

Anyone with a bit more knowledge of java might be able to sort out the last
point. It would certainly be nice to have a tweaked version of the
graphhopper web page for our own demo purposes.

The key thing is that at least I've demonstrated that it works in practice
as well as in principle.

I think it also highlights what Karl said: that historical-based search
will be important.

Regards,

Jerry
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