Unit 1

The digital elevation model (DEM) is a raster-based digital dataset of the topography (hypsometry and/or bathymetry) of all or part of the Earth (or a telluric planet). ... The acoustic tablet, or spark tablet, used a stylus that generated clicks with a spark plug. ... The balloonist G. Tournachon (alias Nadar) made photographs of Paris from ... ................
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