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The US Geological Survey Chesapeake Bay Watershed Land Cover Data Series, 2011 edition, (CBLCD-e11) consists of Level I Land Cover data for the years 1984, 1992, 2001, 2006 and 2011. It consists of a series of five 8-bit unsigned integer raster data files of 30 meter spatial resolution in Albers Conic Equal Area projection, NAD83 datum. The 1984 – 2006 data layers were created by aggregating most Level II Anderson classes of the USGS CBLCD Land Cover Data Series released in 2010 (Irani and Claggett, 2010).
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Investigations of coastal change and coastal resources often require continuous elevation profiles from the seafloor to coastal terrestrial landscapes. Differences in elevation data collection in the terrestrial and marine environments result in separate elevation products that may not share a vertical datum. This data release contains the assimilation of multiple elevation products into a continuous digital elevation model at a resolution of 3-arcseconds (approximately 90 meters) from the terrestrial landscape to the seafloor for the contiguous U.S., focused on the coastal interface. All datasets were converted to a consistent horizontal datum, the North American Datum of 1983, but the native vertical datum for...
Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Alabama, CMGP, California, Canadian Hydrographic Service, Chesapeake Bay, All tags...
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This dataset contains watershed means of estimated percent impervious surfaces for three time periods: 1992, 2002, and 2012. Estimates are based on coefficients derived from comparing land use of the 2012 NAWQA Wall-to-wall Anthropogenic Land-use Trends (NWALT) product to the 2011 National Land Cover Database (NLCD) imperviousness, then applying those coefficients to previous years (1974-2002) of the NWALT dataset.
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This data set presents attributes of floodplain ecosystem characteristics including floodplain soil denitrification, floodplain soil biogeochemistry, floodplain vegetation, floodplain sedimentation, floodplain and channel morphometry, stream discharge and water quality, floodplain climate, floodplain physiographic region, and catchment land cover. Attributes are associated with 18 floodplains of the Chesapeake Bay watershed. For many of these attributes, mean values are summaries of multiple measurements made within each floodplain site.
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Field spikes were prepared at 207 stream and river sites as part of the U.S. Geological Survey (USGS) National Water Quality Assessment (NAWQA) project between December, 2012, and September, 2015. At the field site, a depth-and width-integrated environmental sample was collected, and one subsample of the environmental sample was spiked with a known amount of a spike mixture. Both the spiked subsample ("spike sample") and another subsample ("environmental sample") of the original water sample were analyzed for pesticides at the USGS National Water Quality Laboratory (NWQL) by direct injection liquid chromatography with tandem mass spectrometry (LC-MS/MS), and were used to calculate the spike recovery of each analyte....


map background search result map search result map Chesapeake Bay Watershed 2011 Edition Land Cover Data Release Percent impervious surface for selected Chesapeake Bay watersheds Elevation artifacts in digital bathymetric and topographic models for United States east (east_cdem_v1.tif) and west (west_cdem_v.tif) coasts (polygon shapefile, geographic, NAD83) USGS Topo Map Vector Data (Vector) 8721 Church Creek, Maryland 20201007 for 7.5 x 7.5 minute Shapefile USGS Topo Map Vector Data (Vector) 18902 Hagerstown, Maryland 20201007 for 7.5 x 7.5 minute FileGDB 10.1 USGS Topo Map Vector Data (Vector) 19979 Hedgesville, West Virginia 20200417 for 7.5 x 7.5 minute Shapefile USGS Topo Map Vector Data (Vector) 34991 Phoenix, Maryland 20201007 for 7.5 x 7.5 minute FileGDB 10.1 USGS Topo Map Vector Data (Vector) 35975 Poolesville, Maryland 20201007 for 7.5 x 7.5 minute Shapefile USGS Topo Map Vector Data (Vector) 39275 Saint George Island, Maryland 20201007 for 7.5 x 7.5 minute Shapefile USGS Topo Map Vector Data (Vector) 39360 Saint Michaels, Maryland 20201007 for 7.5 x 7.5 minute Shapefile USGS Topo Map Vector Data (Vector) 41000 Shepherdstown, West Virginia 20200416 for 7.5 x 7.5 minute Shapefile USGS Topo Map Vector Data (Vector) 42284 South River, Maryland 20201007 for 7.5 x 7.5 minute Shapefile USGS Topo Map Vector Data (Vector) 71681 Spesutie, Maryland 20201007 for 7.5 x 7.5 minute FileGDB 10.1 USGS Topo Map Vector Data (Vector) 72035 Whaleyville, Maryland 20201007 for 7.5 x 7.5 minute FileGDB 10.1 USGS Topo Map Vector Data (Vector) 49953 Wye Mills, Maryland 20201007 for 7.5 x 7.5 minute FileGDB 10.1 USGS Topo Map Vector Data (Vector) 49953 Wye Mills, Maryland 20201007 for 7.5 x 7.5 minute Shapefile USGS Topo Map Vector Data (Vector) 23690 Kinsale, Virginia 20190917 for 7.5 x 7.5 minute FileGDB 10.1 USGS Topo Map Vector Data (Vector) 23690 Kinsale, Virginia 20190917 for 7.5 x 7.5 minute Shapefile Data on denitrification and ecological characteristics of nontidal floodplains, Chesapeake Bay watershed, USA, 2013-2016 Data on denitrification and ecological characteristics of nontidal floodplains, Chesapeake Bay watershed, USA, 2013-2016 Percent impervious surface for selected Chesapeake Bay watersheds Chesapeake Bay Watershed 2011 Edition Land Cover Data Release Elevation artifacts in digital bathymetric and topographic models for United States east (east_cdem_v1.tif) and west (west_cdem_v.tif) coasts (polygon shapefile, geographic, NAD83)