Filters: Tags: 30 x 60 minute (X) > partyWithName: Daniel H Doctor (X)

Filters Date Range Past year (0) Past month (0) Past week (0) Past day (0) Custom range... To   Search Contacts Cheyenne L Cox Florence Bascom Geoscience Center U.S. Geological Survey U.S. Geological Survey - ScienceBase Core Science Systems Categories Data (1) Tag Types Theme (1) Place (1) USGS Scientific Topic Keyword (1) Harvest Set (1) Tag Schemes USGS Thesaurus (1) View Results as: JSON ATOM CSV

Lidar-derived closed depression vector and density raster in karst areas of the Winchester 30 x 60-minute quadrangle The Winchester 30 x 60 minute quadrangle, covering northern Virginia, West Virginia, and Maryland, hosts karsts within carbonate units of Devonian to Cambrian age. Lidar-derived elevation data, acquired between 2011 and 2019, were used to create a mosaic of 1-meter resolution working digital elevation models (DEMs), from which surface depressions were identified using a semi-automated workflow in ArcGIS. Depressions in the automated inventory were systematically checked by a geologist using aerial imagery, lidar-derived imagery, and 3D viewing of the lidar imagery. Distinguishing features, such as modification by human activities or hydrological significance (stream sink, ephemerally ponded, etc.), were noted wherever... Categories: Data; Tags: 30 x 60 minute, Geomorphology, Hydrology, Maryland, USGS Science Data Catalog (SDC), All tags... United States, Virginia, West Virginia, Winchester, geologic maps, geology, geomorphology, hydrogeology, karst, maps and atlases, sinkhole formation, Fewer tags