Marina J. Metes Daniel K. Jones 20211015 Raster Digital Data Set Reston, VA U.S. Geological Survey https://doi.org/10.5066/P9OVTCK4 This dataset contains a 6 foot resolution digital elevation model (DEM) covering two watersheds in Clarksburg, Montgomery County, Maryland. This dataset was used to delineate drainage networks from topographic attributes. All processing steps were completed using ArcMap 10.3 (Esri 2011). Esri (2011). ArcGIS Desktop. (Release 10). Redlands, CA: Environmental Systems Research Institute. 20131228 ground condition Complete None planned -77.31552 -77.24695 39.27998 39.22982 USGS Thesaurus digital elevation models topography lidar USGS Metadata Identifier USGS:5f8f12ef82ce06b040efc8cd Common geographic areas Maryland none none Marina J. Metes U.S. Geological Survey, Maryland-Delaware-DC Water Science Center Physical Scientist mailing and physical

5522 Research Park Drive

Catonsville MD 21228 US 443-498-5576 mmetes@usgs.gov Environment as of Metadata Creation: Microsoft [Unknown] Version 6.2 (Build 9200) ; Esri ArcGIS 10.7.1 (Build 11595) Service Pack N/A (Build N/A) No formal attribute accuracy tests were conducted The digital elevation model was manually inspected to ensure values fell within expected range. Data set is considered complete for the information presented, as described in the abstract. Users are advised to read the rest of the metadata record carefully for additional details. There is no reported horizontal accuracy. The average point spacing of LAS points is 3 ft. The reported vertical accuracy is 0.172 ft Montgomery County, MD 2014 LAS files Bel Air, MD Montgomery County, MD - Department of Parks and Planning https://imap.maryland.gov/Pages/lidar.aspx Digital and/or Hardcopy 20131227 20131228 20140107 ground condition Montgomery County, MD Aerial Lidar Terrain Data 2014 LAS files of 3D point data used to generate original raw DEM Bare Earth LAS points were classified by the vendor and obtained from the state of Maryland's online mapping and GIS data portal. Montgomery County, MD Aerial Lidar Terrain Data 2014 2016 LAS points were converted to a multipoint shapefile using the LAS to Multipoint tool in the Esri 3D Analyst toolbox (Esri 2011). 2016 A 3 ft resolution DEM was interpolated from the multipoint shapefile using the natural neighbor interpolation tool in the Esri Spatial Analyst toolbox (Esri 2011). 2016 The 3 ft DEM was aggregated to 6 ft using the average value of the input cells with the Aggregate tool in the Esri Spatial Analyst toolbox (Esri 2011). 2016 Raster Grid Cell 3035 3227 1 Lambert Conformal Conic 38.3 39.45 -77.0 37.66666666666666 1312333.333333333 0.0 row and column 6.0 6.0 survey feet D_North_American_1983 GRS_1980 6378137.0 298.257222101 Raw_DEM.tif Geospatial Dataset U.S. Geological Survey Value Ground elevation in feet U.S. Geological Survey 362.144 723.722 feet ScienceBase U.S. Geological Survey mailing and physical

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Denver CO 80225 United States 1-888-275-8747 sciencebase@usgs.gov Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data for other purposes, nor on all computer systems, nor shall the act of distribution constitute any such warranty. Raster Digital Data Set ArcGIS 10.3 GeoTIFF https://doi.org/10.5066/P9OVTCK4 none 20211015 Marina J. Metes U.S. Geological Survey, Maryland-Delaware-DC Water Science Center Physical Scientist mailing and physical

5522 Research Park Drive

Catonsville MD 21228 US 443-498-5576 443-498-5510 mmetes@usgs.gov Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998