Differences in Average Elevation by Subwatershed for Ex 3, p.40

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Differences in Average Elevation by Subwatershed for Ex 3, p.40 Calculating average subwatershed elevation involves about half a million cells per subwatershed, the differences in average elevation are about 5 cm in 250m, or about 0.02% Average Elevation (m) HydroID Student Exercise Diff (Cm) # Cells 330 189.91 189.86 -5.00 323069 331 418.54 418.48 -6.00 1023567 332 288.63 288.57 165683 333 266.19 266.11 -8.00 140798 334 151.93 151.94 1.00 579142 335 183.59 183.54 1089142 Average 249.80 249.75 -4.83 553567 Root Mean Square Error of National Elevation Dataset from true elevation is 2.34m Computational error is far smaller than the inherent error in the elevation data themselves