Col-East International Ltd, a provider of aerial photogrammetric services in the Northeast U.S. since 1952, tapped into its extensive archive of aerial imagery to create hybrid topographic maps of an area of Marshfield, Mass. The map products contained data from spring and summer image acquisitions as well as fieldwork to satisfy the diverse requirements of multiple planned applications. “We extracted topography from low-tide 2010 spring air photos and merged it with field-su