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What cell sizes are used to represent the shaded relief?

Shaded relief layers based on GTOPO30 are represented in 30, 60, and 120 arc-second cells. The approximate equivalent metric values are 1, 2, and 4 kilometers. Shaded relief layers from the NED are derived from input data that are represented in 1/3, 1, 4, 8, and 16 arc-second cells. The approximate equivalents in meters are 10, 30, 120, 240, and 480.

Tags: Maps, Topographic, Recreation, Quadrangle, GeoPDF, Scale