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Filters Date Types (for Date Range) Extensions ArcGIS Service Definition (2) Raster (1) Types ArcGIS Service Definition (2) Downloadable (2) Map Service (2) Citation (1) Raster (1) Contacts Conservation Science Partners John R. Olson Charles P Hawkins Center for Large Landscape Conservation David Theobald Desert Research Institute U.S. Geological Survey - ScienceBase Categories Data (2) Map (1) Tag Types Theme (12) Place (5) Tags (with Scheme=None) bedrock (1) canada (1) conterminous u.s. (1) degree of human modification (1) ecological integrity (1) fuzzy sum (1) geochemistry (1) More... View Results as: JSON ATOM CSV

Human Modification for the Canada-US Transboundary Study Area Measures of ecological integrity are increasingly being used to monitor and evaluate the status and condition of their landscapes, and numerous methods have been developed to map the pattern of human activities. The ‘Human Modification – Transboundary (HMT)’ model is designed to provide a comprehensive, but parsimonious approach, that uses several stressor/threats datasets to estimate level of human modification. There are three important elements that define the HM approach: (a) the human modification stressors and their data sources (b) the measurement unit used for each stressor, and (c) the method used to combine the effects of multiple stressors into an overall score of human modification. The way in which... Categories: Data; Types: ArcGIS REST Map Service, ArcGIS Service Definition, Downloadable, GeoTIFF, Map Service, Raster; Tags: Canada, Great Northern LLC, United States, degree of human modification, ecological integrity, All tags... fuzzy sum, land use, landscape assessments, landscape integrity, landscape stressors, transboundary, Fewer tags Geochemical Characteristics of the Conterminous United States: % Na2O This raster depicts the percentage of lithological sodium oxide (Na2O) content in surface or near surface geology. We derived these rasters by calculating the average percent Na2O content for each map unit in combined surficial-bedrock geologic maps. We used state geologic maps (Preliminary Integrated Geologic Map Databases for the United States, Open File Reports 2004-1355, 2005-1305, 2005-1323, 2005-1324, 2005-1325, 2005-1351, and 2006-1272), which depict surficial geology instead of bedrock when the surficial layers are sufficiently deep. For the state maps that do not incorporate surficial geology (i.e., midwestern states), we overlaid surficial geologic map units with thicknesses greater than 100 feet (from... Categories: Data, Map; Types: ArcGIS REST Map Service, ArcGIS Service Definition, Citation, Downloadable, GeoTIFF, Map Service; Tags: Bedrock, Conterminous U.S., Geochemistry, Geology, Na2O, All tags... Sodium, Fewer tags