[GraphHopper] Dynamic routing for Crisis/Disaster Areas

[Markware Software Services]

Hi Peter

One of the applications we will use GraphHopper for is the provision of off
line routeable maps for use on an Android Application in Disaster and
Crisis Situations

The maps will be created form OSM data exrtacted  using a bounding box and
Osmois particular to the disaster in question,. We envisage a new map being
created once or twice per day to be downloaded when responders are bck at
base with the latest data. This is a result of teh disaster and crisis
mapping done in eal time by members of the Humanitarian Open Street map
Team (HOT) who put in massive efforts mapping from Satellite Images.

Part of the functionality of the Android App will be to allow people in the
filed to note road closures , etc, information that will affect routing in
these areas.

We have been considering how best to implement this featute so that the
routing graph is updated to reflect the changes as soon as possible. In
this way, the Off Line App becomes a very useful tool for responders to
figure out how to get from A to B with very up to date information form the
APP reported by others.

Our first thought was to actually update the OSM database with a Node in
the road and a cost or similar that prevented the route to occur, but I
expect we will meet some resistance to this, primarily because the data
will need to be cleaned up at some stage and there is no way to make sure
this happens, hence future routing will be an issue

It occurred to me that there must be a way to do it at the time the Graph
is created. IN a perfect world, we would our like App to be able to flag
road sections as follows:

Totally Impassable
Passable on Foot only
Passable by Cyclist Only
Passable by Motor Cycle Only
Passable by 4WD only
Open (not flagged at all)

(Obviously, if a 4WD can pass, it means that the Foot, Motor Cycle,
Cyclist, etc can also pass)

Do you see any way that this could be implemented at Graph Creation Time?

One thought I had was a separate file of Lats/Longs and a code that
indicated the road status flag, or no flag if road in normal state. This
file could be preprocessed  prior to running the GraphHopper graph creation
on the OSM file itself or as part of the Graph Creation Process

I would be very keen to hear your thoughts or anyone else's on how best to
implement this.

This is a Humanitarian project we are doing at no cost and will make freely
available to the community, anyone who wants to use it.


Kind Regards

Mark Cupitt

"If we change the world, let it bear the mark of our intelligence"

See me on LinkedIn <http://ph.linkedin.com/in/markcupitt>
*See me on StackExchange <http://gis.stackexchange.com/users/17846/mark-c>*

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