<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE metadata SYSTEM "http://thor-f5.er.usgs.gov/ngtoc/metadata/fgdc-std-001-1998.dtd">
<metadata>
  <idinfo>
    <citation>
      <citeinfo>
        <origin>Woolpert</origin>
        <pubdate>20230915</pubdate>
        <title>OH_StatewideP3_6_B21; Project ID: 222528 - WU300169; Hydro-Flattened Bare-Earth DEM</title>
        <geoform>Raster digital data</geoform>
      </citeinfo>
    </citation>
    <descript>
    	<abstract>Product: 1.25 US Foot bare-earth raster digital elevation model (DEM) data tiles in GeoTIFF format.
    	  Geographic Extent: Approximately covering 2188 square miles in Ohio.
    		Dataset Description: OH_StatewideP3_6_B21 lidar project called for the planning, acquisition, processing, and production of derivative products of QL1 lidar data to be collected an aggregate nominal pulse spacing (ANPS) of 0.22-meters and 20 points per square meter (ppsm). Project specifications were based on the U.S. Geological Survey National Geospatial Program Base Lidar Specification, Version 2022 revision A. The data was developed based on a horizontal reference system of NAD83 (2011) Ohio State Plane South FIPS 3402 (EPSG  6551) and a vertical reference system of NAVD88 (GEOID18) US Feet. DEM data was delivered as processed GeoTIFF files formatted to 40,437 individual 1,250-US Feet x 1,250-US Feet tiles.
    		Ground Conditions: Lidar was collected from December 26, 2021, through April 20, 2022 while no snow was on the ground and rivers were at or below normal levels. In order to post process the lidar data to meet task order specifications and meet ASPRS vertical accuracy guidelines, Woolpert established ground control points that were used to calibrate the lidar to known ground locations established throughout the entire project area. An additional independent accuracy checkpoints were collected throughout the entire project area and used to assess the vertical accuracy of the data. These checkpoints were not used to calibrate or post process the data</abstract>
      <purpose>This project will support the 3DEP mission, the Natural Resources Conservation Service (NRCS) high-resolution elevation enterprise, and many state and local agencies.</purpose>
      <supplinf>USGS Contract No. G16PC00022, Task Order No. 140G0221F0254, Project Name: OH Statewide Phase3 2021 B21. Contractor: Woolpert.
        Raster File Type = TIFF
        Bit Depth/Pixel Type = 32-bit float
        Raster Cell Size = 1.25-US Feet
        Interpolation or Re-sampling Technique = Triangulated Irregular Network
        Required Vertical Accuracy = 19.6 cm NVA
      </supplinf>
    </descript>
    <timeperd>
    	<timeinfo>
    		<rngdates>
    			<begdate>20211226</begdate>
    			<enddate>20220420</enddate>
    		</rngdates>
    	</timeinfo>
    	<current>ground condition</current>
    </timeperd>
  	<status>
  		<progress>Complete</progress>
  		<update>None planned</update>
  	</status>
  	<spdom>
  		<bounding>
  			<westbc>-84.860901</westbc>
  			<eastbc>-83.241536</eastbc>
  			<northbc>40.286618</northbc>
  			<southbc>39.002045</southbc>
  		</bounding>
  		<lboundng>			
  			<leftbc>1309670</leftbc>
  			<rightbc>1757830</rightbc>
  			<topbc>833750</topbc>
  			<bottombc>373420.000000063</bottombc>
  		</lboundng>
  	</spdom>
    <keywords>
      <theme>
        <themekt>None</themekt>
      	<themekey>DEM</themekey>
      	<themekey>Elevation Data</themekey>
      	<themekey>Lidar</themekey>
      	<themekey>Model</themekey>
        <themekey>Raster</themekey>        
        <themekey>Remote Sensing</themekey>
      </theme>
    	<place>
    		<placekt>None</placekt>
    		<placekey>United States</placekey>
    	  	<placekey>Ohio</placekey>
    		<placekey>Champaign County</placekey>
    		<placekey>Fayette County</placekey>
    		<placekey>Hamilton County</placekey>
    		<placekey>Preble County</placekey>
    		<placekey>Warren County</placekey>
    	</place>
    </keywords>
    <accconst>No restrictions apply to these data.</accconst>
    <useconst>None. However, users should be aware that temporal changes may have occurred since this dataset was collected and that some parts of these data may no longer represent actual surface conditions. Users should not use these data for critical applications without a full awareness of its limitations. Acknowledgement of the U.S. Geological Survey would be appreciated for products derived from these data.
      Woolpert prepared the original data as set forth in the Scope of Services, in accordance with reasonable care and due diligence as set forth in this Agreement, however, due to the easily alterable nature of electronic media, files, documents, and other deliverables, Woolpert makes no warranties, either expressed or implied, with respect to the accuracy, completeness, merchantability, or fitness for any particular purpose, including, but not limited to, use of any/all data as described within this metadata file, by any user of this data. Any use will be at the end-user's sole risk.</useconst>
		<native>Microsoft Windows 10 ; ArcMap 10.7; ArcCatalog 10.7; TerraScan ver. 20; TerraModeler ver. 20; LP360.</native>
  </idinfo>
  <dataqual>
    <logic>Data covers the entire area specified for this project.</logic>
    <complete>Datasets contain complete coverage of tiles. No points have been removed or excluded. A visual qualitative assessment was performed to ensure data completeness. There are no void areas or missing data. The DEM is of good quality and data passes Non-Vegetated and Vegetated Vertical Accuracy specifications.</complete>
    <posacc>
      <vertacc>
        <vertaccr>This data set was produced to meet ASPRS Positional Accuracy Standard for Digital Geospatial Data (2014) for a 10-cm RMSEz Vertical Accuracy Class.</vertaccr>      
      </vertacc>
    </posacc>
    <lineage>
      <procstep>
        <procdesc>Hydro-Flattened Digital Elevation Models (DEMs): Class 2 (ground) lidar points in conjunction with the hydro breaklines as well bridge breaklines were used to create a 1.25 US-Feet, hydro-flattened bare-earth raster DEM. Using automated scripting routines within ArcMap, a GeoTIFF file was created for each tile. Each surface is reviewed using Global Mapper to check for any surface anomalies or incorrect elevations found within the surface. During acquisition, areas in Fayette County were observed as having persistent industrial steam or smoke that obscured full lidar penetration to the surface resulting in diminished point density and voids. A low confidence polygon shapefile indicating these areas has been generated and delivered.</procdesc>
      	<procdate>20230915</procdate>
      </procstep>
    </lineage>
  </dataqual>
  <spdoinfo>
    <direct>Raster</direct>
    <rastinfo>
      <rasttype>Pixel</rasttype>
    	<rowcount>1000</rowcount>
    	<colcount>1000</colcount>
    </rastinfo>
  </spdoinfo>
	<spref>
	  <horizsys>
	    <planar>
	      <gridsys>
	      	<gridsysn>State Plane Coordinate System 1983</gridsysn>
	      	<spcs>
	      		<spcszone>3402</spcszone>
	      		<lambertc>
	      			<stdparll>38.73333333333333</stdparll>
	      			<stdparll>40.03333333333333</stdparll>
	      			<longcm>-82.5</longcm>
	      			<latprjo>38.0</latprjo>
	      			<feast>1968500.0</feast>
	      			<fnorth>0.0</fnorth>
	          </lambertc>
	        </spcs>
	      </gridsys>
		<planci>
		 <plance>row and column</plance>
		 <coordrep>
		   <absres>1.25</absres>
		   <ordres>1.25</ordres>
		 </coordrep>
		 <plandu>Foot_US</plandu>
		</planci>
	     </planar>
	    <geodetic>
	      <horizdn>North American Datum of 1983 (2011)</horizdn>
	      <ellips>Geodetic Reference System 1980</ellips>
	      <semiaxis>6378137.0</semiaxis>
	      <denflat>298.257222101</denflat>
	    </geodetic>
	  </horizsys>
	  <vertdef>
	    <altsys>
	      <altdatum>North American Vertical Datum of 1988 (GEOID18)</altdatum>
	      <altres>0.01</altres>
	      <altunits>Foot_US</altunits>
	      <altenc>Explicit elevation coordinate included with horizontal coordinates</altenc>
	    </altsys>
	  </vertdef>
	</spref>
	<metainfo>
		<metd>20230915</metd>
		<metc>
			<cntinfo>
				<cntorgp>
					<cntorg>Woolpert</cntorg>
				</cntorgp>
				<cntaddr>
					<addrtype>mailing and physical</addrtype>
					<address>4454 Idea Center Blvd.</address>
					<city>Dayton</city>
					<state>OH</state>
					<postal>45430</postal>
					<country>USA</country>
				</cntaddr>
				<cntvoice>(937) 461-5660</cntvoice>
			</cntinfo>
		</metc>
		<metstdn>FGDC Content Standard for Digital Geospatial Metadata</metstdn>
		<metstdv>FGDC-STD-001-1998</metstdv>
	</metainfo>
</metadata>