Filters: Categories: Image (X) > Tags: {"type":"theme"} (X) > Date Range: {"choice":"year"} (X) > Categories: Physical Item (X)

Filters Date Types (for Date Range) Extensions NGGDPP Collection (1) Types Collection (1) Map Service (1) OGC WFS Layer (1) OGC WMS Layer (1) OGC WMS Service (1) Contacts MGS Curator Maryland Geological Survey Categories Data (1) Tag Schemes https://www.sciencebase.gov/vocab/category/NGGDPP/nggdpp_collection_types (1) Tags (with Type=theme ) ndc_collection (1) View Results as: JSON ATOM CSV

Quad-Based Aerial Photographs, 1936-1991 This collection (known internally at Maryland Geological Survey as Component 5) consists of 4,720 items – 4,715 black-and-white aerial photographs (4,688 unique frames plus 27 duplicates) and 5 associated index maps. The aerial photographs were flown or acquired by the U.S. Geological Survey (USGS) and organized on a 7.5-minute quadrangle basis. The photographs are black-and-white and approximately 9 in. x 9 in. in size. The scale of the aerial photography varies but ranges from approximately 1:12,000 to 1:35,400. These photographs date from 1936-1991 and were donated to the Maryland Geological Survey (MGS). The index maps serve as a finding aid for several of the flight series flown over five quadrangles... Categories: Data, Image, Physical Item; Types: Collection, Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: ndc_collection