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

Between 1801 and 1812, North West Company fur trader, explorer, and cartographer David Thompson established two viable trade routes across the Rocky Mountains in Canada and systematically surveyed the entire 1,250-mile course of the Columbia River. In succeeding years he distilled his mathematical notations from dozens of journal notebooks into the first accurate maps of a vast portion of the northwest quadrant of North America. The writings in those same journals reveal a complex man who w...