Thanks for reply! I have not had time to continue work on this project so far, so anything you find is the most up to date information.

The most important places to find out more:

My blog entries about the project:
http://sprovoost.nl/category/gsoc/

The OpenStreetMap wiki:
http://wiki.openstreetmap.org/index.php/Route_altitude_profiles_SRTM

To answer your questions:

I am indeed using SRTM3 data.

I am glad to hear that you want to use SRTM data to improve routing; I have not done any routing myself and as far as I know nobody has incorporated elevation ‘challenge’ in their routes. At least no open source (bike route) planners.

Keep in mind though that when you apply weights, they are path dependent. For example, it is easier to go down and then up, then to go up and then down. So how hard a certain elevation change is, depends (partially) on the rest of the route.

I interpolated with bilinear interpolation:
http://en.wikipedia.org/wiki/Bilinear_interpolation

I hope the code make sense. But feel free to email me with questions!

Cheers,

Sjors

Hi, I just discovered your blog. Funny enough, your thing is almost exactly the same to the one I am doing. I mean, I think it is. I read that you use SRTM3 and based on it generate the approximate altitude profile of given route calculated from OSM data. Please let me know if there are some other functionalities you have added, so I do not multiply the work done.
My idea is to use SRTM data to adjust the weights on the road network graph so I can use it to generate route, which would be quite useful for cyclists.
I hope you could advice me on how to make an interpolation of SRTM on given route, so I will not reinvent the wheel.
Thanx

Jacek