Feature/terrain tiles #28
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Shapely, Fiona, rasterio and pyproj are used in supporting scripts but not in the core package.
- interpolation to use geometric distance - number of samples strictly between 2 and 600
Using ALOS World 30m DEM sourced via OpenTopography
Use GDAL VRT file to abstract over multiple raster tiles. Use point_query to sample elevation profile.
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Handle point-to-point and area queries over multiple terrain tiles.
The approach taken here is to simplify and rely on GDAL Virtual Format which allows a virtual dataset to be composed of multiple files.