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Location Folder Show Tree ROOT ScienceBase Catalog Users Filters Date Range Past year (0) Past month (0) Past week (0) Past day (0) Custom range... To   Search Extensions Raster (2) Types Map Service (3) Downloadable (2) GeoTIFF (2) Raster (2) OGC WFS Layer (1) OGC WMS Layer (1) OGC WMS Service (1) Contacts Kristina G Hopkins Peter R Claggett U.S. Geological Survey - ScienceBase South Atlantic Water Science Center U.S. Geological Survey More... Categories Data (2) Tag Types Theme (4) Place (4) Harvest Set (2) Label (1) Tag Schemes USGS Thesaurus (4) Common geographic areas (3) None (3) Geographic Names Information System (GNIS) (1) ISO 19115 Topic Category (2) View Results as: JSON ATOM CSV Browse Folder

Digital Elevation Model of the Difficult Run watershed in Fairfax County, Virginia Derived from 2012 lidar LAS Points Aerial light detection and ranging (lidar) data were collected over the study site between April 12 – 14, 2012 as part of the Fauquier, Fairfax, Frederick (MD), and Jefferson County acquisition for FEMA Region 3 FY12 VA lidar (Dewberry 2012). Lidar points classified as ground and water were used to create a 3-m digital elevation model (DEM) clipped to the Difficult Run watershed with a 500-m buffer in ArcGIS 10.3.1 (ESRI, Redlands, CA). Categories: Data; Types: Downloadable, GeoTIFF, Map Service, Raster; Tags: Difficult Run, Fairfax, Virginia, elevation, topography Stream Channel and Floodplain Metric Toolbox NOTE: the Stream Channel and Floodplain Metric Toolbox has been superseded by a newer tool, FACET. The Stream Channel and Floodplain Metric Toolbox was developed to demonstrate the feasibility of mapping fluvial geomorphic features from high-resolution bare-earth elevation data. A Python toolbox for ArcGIS was built to calculate key metrics describing channel and floodplain geometry. Channel and Floodplain Metric Toolbox provides this ability in an automated fashion, allowing for regional analyses based solely on digital elevation models (DEMs). This manual describes the general operation of the toolbox and technical details describing the specific algorithms. The toolbox works best in a watershed no larger than... Tags: Fairfax County, Software, USGS Science Data Catalog (SDC), Virginia, geomorphology, All tags... sedimentation, topography, Fewer tags Difficult Run Floodplain Sediment and Nutrient Retention Ecosystem Service Datasets, Fairfax County, Virginia Datasets used to quantify and value the ecosystem service of sediment and nutrient retention for floodplains within the Difficult Run watershed located in Fairfax County, Virginia. Geospatial datasets include a digital elevation model (DEM), a hydrologically conditioned DEM, output from the USGS Stream Channel and Floodplain Metric Toolbox, and field data sets used to develop regression models to predict sediment and nutrient retention services for stream within the Difficult Run watershed. Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Difficult Run, Fairfax, USGS Science Data Catalog (SDC), Virginia, ecosystem functions, All tags... ecosystem services valuation, geomorphology, geospatial datasets, river reaches, Fewer tags Hydrologically Conditioned Digital Elevation Model of the Difficult Run watershed in Fairfax County, Virginia Derived from 2012 lidar LAS Points Hydrologically conditioned digital elevation model (DEM) generated from lidar data clipped to the Difficult Run watershed with a 500-m buffer in ArcGIS 10.3.1 (ESRI, Redlands, CA). The DEM was hydrologically corrected by breaching through pits with no downslope neighboring cells to force surface flow to continuously move downslope using Whitebox Geospatial Analysis Tools (Lindsay and Dhun 2015, Lindsay 2016). Pits that were not properly breached were manually adjusted using elevation information from the DEM and aerial imagery to locate culverts under roadways. Categories: Data; Types: Downloadable, GeoTIFF, Map Service, Raster; Tags: Difficult Run, Fairfax, Virginia, elevation, topography