| http://www.w3.org/ns/prov#value | - Gill used real elevation data to plot out Mars??? oceans, mountains, valleys, and other geological features ??? but then he used his own judgment to paint in the deserts, forests, and so on, using textures from NASA???s Blue Marble imagery. ???There is no scientific reasoning behind how I painted it; I tried to envision how the land would appear given certain features or the effects of likely atmo
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