What is a 7.5 quadrangle map?
A 7.5 quadrangle map is one of the standard topographic maps produced by the USGS. One degree is divided into 60 minutes. A 7.5 quad is 7.5 minutes of longitude wide and 7.5 minutes of latitude high. The scale is 1 to 24,000 meaning 1 inch on the map is 24,000 inches (2,000 feet) on the actual ground. Topographic maps show natural and cultural features. Contour lines, which are actually curves, indicate elevation.
