Note that the contour lines plugin and Brouter use the data gathered by the 2000 Space Shuttle Mission called SRTM using radar, that has a horizontal resolution of 30m. Hence, using the contour lines plugin, you could walk over a cliff unless it had been marked as such in OpenStreetmap; even if so, you could easily mistake the rendering of a cliff for a footpath and be distracted by the contour lines that smooth everything out to 30m.
Several countries have been open-sourcing LIDAR surveys (laser topography from aircraft). This can be so accurate you can see a car or a tree in the elevation data, and other datasets filter this to give the underlying terrain. OpenAndroMaps recently included this data for Austria. In the UK, 60%+ of the country has been released, concentrated on areas of flood risk. As LIDAR surveys are completed, and hopefully open-sourced, it could change a lot in terms of elevation-aware navigation (and with a resolution of <=1m, steepness-aware routing too). Meanwhile, Google are independently gathering GPS elevations at least from where people drive, but this isn't open-source. It's an interesting time for map-lovers! I found a presentation by the man behind Brouter here <https://youtu.be/c0TehKCX4Ao>. My German is only good enough to understand the gist of his powerpoint about the problems with SRTM, but I still found it interesting. -- You received this message because you are subscribed to the Google Groups "Osmand" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
