[GraphHopper] Alternative open data height sources.

[Peter]

Hi,

should be faily easy. See the ElevationProvider interface. (But keep in
mind that the license of that has to be compatible)

> (for example when following a disused railway path through a tunnel,
the current implementations default to taking the
> ground surface level for the underground route, rather than a direct
interpolation between the two end points of the tunnel...

Feel free to provide a PR, there are several enhancements possible and
we need to go step by step.

Regards,
Peter.

On 23.07.2014 17:45, D KING wrote:
> How easy would it be to use alternative data sources for height map
> lookup? In particular in the UK we have available some 50m post
> spacing open data from Ordnance Survey, which is much more consistent
> and reliable than CGIAR or SRTM data sources.
>
> https://www.ordnancesurvey.co.uk/business-and-government/products/terrain-50.html
>
> Also how can tunnels/bridges be handled better (for example when
> following a disused railway path through a tunnel, the current
> implementations default to taking the ground surface level for the
> underground route, rather than a direct interpolation between the two
> end points of the tunnel... and the same point, in reverse applies to
> elevated routes and bridges over other roads, rail, rivers etc...
> (Ideally there would be a rise over the bridge span, but even a direct
> interpolation would be an improvement over dropping to the valley
> floor in each span.
>
>
>
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