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This collection (known internally at Maryland Geological Survey as Component 3) consists of 192 items – 191 unrectified, black-and-white, 19-inch by 19-inch photographic enlargements taken over the Rockville-Laurel area of Montgomery County, Maryland (176 unique frames plus duplicates); and one index map which shows the flight lines for the GS-VRCA-1 flight series. These photographs were flown annually or biannually, during 12 different time periods (or “sets”) between June 1966 and July 1974. The scale of these photographs is unknown. The scale of the index map is 1:125,000. These aerial photographs were scanned by Maryland State Archives (MSA) and are available in JPF, JPG, PDF, and TIF format. The index...
Categories: Data,
Physical Item;
Types: Collection,
Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: ndc_collection
The Maryland Geological Survey (MGS) Land-Based Core Collection consists of approximately 1,110 boxes of rock and/or sediment core material from 250 known borehole or well locations. These locations include sites in 18 Maryland counties: Anne Arundel, Calvert, Caroline, Carroll, Cecil, Charles, Dorchester, Frederick, Garrett, Harford, Kent, Prince George's, Queen Anne's, St Mary's, Somerset, Talbot, Wicomico, and Worcester Counties. Two cores in the Land-Based Core Collection were collected in Virginia (borehole IDs VA 53T 58 and VA 58H 4). To see the geospatial distribution of source boreholes for cores in this collection, click on the word "Map" in the upper right-hand portion of this page. The majority of...
Categories: Data,
Physical Item;
Types: Collection,
Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: ndc_collection
The "Historical Aerial Photographs of Maryland, 1937-1990, County Collection" consists of black and white aerial photos (9"x9", 1:20,000-scale) from several time periods: 1937-1938, 1949, 1951-1953, 1957, 1961-1964, 1968, 1970-1972, 1979-1981, and 1983-1990. These photographs were usually flown or otherwise acquired by the U.S. Department of Agriculture (USDA), the U.S. Geological Survey (USGS), or the private firm Air Photographics, Inc. (API). USDA and USGS photographs were donated to the Maryland Geological Survey (MGS), mainly by the Maryland State Highway Administration (SHA). MGS purchased the copyrighted API photographs. Due to copyright limitations, the public may view the paper API photographs but...
Categories: Data,
Image,
Physical Item;
Types: Collection,
Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: ndc_collection
This collection (known internally at Maryland Geological Survey as Component 2) consists of 505 enlargements of unrectified, black-and-white aerial photographs flown along Maryland's barrier islands during 13 different time periods (or "sets") between October 1952 and July 1964. Each of the photographs in the collection is about 2 feet x 2 feet in size. Some of the photographs have a scale of 1:14,400 or 1:6,000 stamped on the front. On the backs of many of the photographs is another stamp of "1" = 200 ft". The photographs cover the Maryland section of two narrow barrier islands that lie along Maryland's Atlantic coast, separated by the Ocean City Inlet: Fenwick Island to the north and Assateague Island to the...
Categories: Data,
Image,
Physical Item;
Types: Collection,
Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: ndc_collection
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