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FAQ About Mapping Routes
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Q.Where does the elevation data come from?
Our elevation profiles are generated using a Digital Elevation Model (DEM) - a digital representation of the topographic surface of the Earth. It covers the majority of the planet and is derived primarily from the Shuttle Radar Topography Mission (SRTM), an international research project to map the topography of the planet from space. The data has been further developed and enhanced to improve its quality and fill in voids (where data missing), by Jonathan de Ferranti and his colleagues at Viewfinder Panoramas, using topographic maps (from ground and aerial surveys), spot elevations on sketch maps, Landsat satellite imagery and lower-resolution global elevation products.
More FAQ's About Mapping Routes
- How frequently is the Auto-Plot routing updated to take account of map changes?
- Why does the route planner sometimes plot short detours down side streets and then back again?
- How frequently are the maps updated on plotaroute?
- Why does the Total Ascent figure for my route differ from figures calculated by my GPS device or other applications?
- Why can't I auto-plot on a path or road shown on the map?
- Why don't you offer Ordnance Survey maps as an option?
- Where can I find a key or legend for the map?
- Why does the route planner get my home location wrong?
- Does the distance measured by the route planner take account of hills?
- Why does the route planner sometimes say turn left when it is a right turn?
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