Historic DOQs Production of historical DOQs (made from 1948 and 1953 aerial photos) for the San Francisquito Creek Watershed was initially prompted by a need for an analysis of land cover change. The land cover change data will be used in a sediment model of San Francisquito Creek. The sediment model will help people decide how the creek should be managed for flood control, water quality, and steelhead habitat. The historical DOQs will also be useful for other geographical and historical studies of the San Francisquito Creek Watershed area.