The Mapmaker's Eye: David Thompson on the Columbia Plateau

Experience the sweep of human and natural history on the Columbia Plateau through the eyes of intrepid explorer and cartographer David Thompson, who established two viable trade routes across the Rocky Mountains in Canada, systematically surveyed the entire 1,250-mile course of the Columbia River, and subsequently distilled his mathematical notations into the first accurate maps of a vast portion of the northwest quadrant of North America.