I'm writing an Android navigation application using Java in my own time as a learning exercise. It reads Shapefiles (with some pre-processing by me) downloaded from http://ift.tt/1cSrzU0.
I can't find elevation/topographical data in Shapefile format to download anywhere. Can anyone suggest a free source?
Alternatively, I could invest time in learning another GIS file format and writing code to read it. I'd like to choose a format that can be read quickly by devices with low processing power, and is also likely to be widely used in future. Any suggestions?
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