UVM Spatial Analysis Lab, Grove, J.M, O'Neil-Dunne, J. 2009-12-31 Urban area boundaries for 1982, part of the Baltimore-Washington Spatial Dynamics and Human Impacts dataset. The Baltimore-Washington Spatial Dynamics and Human Impacts dataset is an integrated and flexible temporal urban land characteristics database for the Baltimore-Washington metropolitan area. The compilation of this data is a collaborative effort led by the U.S. Geological Survey and the University of Maryland Baltimore County. The database provides visual and historical perspective of the urban growth experienced in the area between 1792 and 1992. Data on built-up areas exists as separate geographic layers for the dates: 1792, 1801, 1822, 1850, 1878, 1900, 1925, 1938, 1953, 1966, 1972, 1982, and 1992. Temporal urban mapping reconstructs past landscapes by incorporating historic maps, census statistics, and commerce records to generate a progressive geo-referenced picture of the past changes in a region. Contemporary mapping focuses on the use of remotely sensed data, existing digital land use data, digital census information, and a variety of earth science infrastructure data, such as Digital Line Graphs, Digital Elevation Models, and key ancillary demographic information. Different procedures were used for different time periods, more fully described for each file in the Process Step Section 2.5.2. The resulting database of temporal urban land use/land cover and demographic changes provides an ideal source of test data and information for both urban geographers and global change research scientists. While this dataset was developed by the University of Maryland Baltimore County final quality control and metadata generation was performed by the University of Vermont's Spatial Analysis Lab. Two significant problems were noted regarding this dataset. The first anomoly is that the 1801, 1822, and 1878 layers have a much smaller extent, and contain data only for Baltimore City. The second discrepancy is that there are also some very obvious positional errors causing misalignments between layers of different dates (i.e. urban areas become non-urban in a very short time period, an unlikely occurance). Urban development, Temporal, Historical, BES, Urban Extent, Urban Boundary, Rural, Urban, Land, Biophyscial resources, Baltimore, MD, Washington, D.C, Chesapeake Bay, Baltimore-Washington, Regional, http://beslter.org/geodatabase_SAL The Baltimore Ecosystem Study ultimately will conduct research and educational activities throughout the Baltimore metropolitan area. This large area includes Baltimore City, Baltimore County, and the counties of Ann Arundel, Carrol, Harford, Howard, and Montgomery. Gwynns Falls includes agricultural lands, recently suburbanized areas, established suburbs, and dense urban areas having residential, commercial and open spaces. In addition, a reference area has been established in a forested catchment of the Gunpowder drainage in Oregon Ridge County Park. -77.314183 -76.012008 39.724847 38.708367 50 700 feet Jonathan Walsh Cary Institute of Ecosystem Studies Information Manager

IES Box AB, 65 Sharon Tpke Millbrook NY 12545 USA

845-677-7600 walshj@ecostudies.org Jarlath O'Neil-Dunne USGS and UMBC. UVM Spatial Analysis Lab joneildu@uvm.edu Baltimore Ecosystem Study

Room 134 TRC Building University of Maryland, Baltimore County 5200 Westland Blvd Baltimore MD 21227

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