<?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>20211129</pubdate>
				<title>OH Statewide Phase 2 2020 B20; Project ID: 197536 - Work Unit ID: 224682; Classified Point Cloud</title>
				<geoform>Lidar point cloud</geoform>
			</citeinfo>
		</citation>
		<descript>
			<abstract>Product: Processed, classified lidar point cloud data tiles in LAS 1.4 format.
				Geographic Extent: Approximately 12,101 square miles in southern Ohio; 1,609 square miles for the WU 224682 AOI.
				Dataset Description: The OH Statewide Phase 2 2020 B20 lidar project called for the planning, acquisition, processing, and production of derivative products of QL1 lidar data to be collected at a nominal pulse spacing (NPS) of 0.35 meters. Project specifications were based on the U.S. Geological Survey National Geospatial Program Base Lidar Specification, Version 2021 revision A. The data was developed based on a horizontal reference system of NAD83 (2011) State Plane Ohio South (FIPS 3402) (EPSG 6551) and a vertical reference system of NAVD88 (GEOID18) US Survey Feet. Lidar data was delivered as processed LAS 1.4 files formatted to 28,701 individual 1,250-feet by 1,250-feet tiles. 
				Ground Conditions: Lidar was collected from March 7, 2021 through April 13, 2021 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 20 ground control points that were used to calibrate the lidar to known ground locations established throughout the entire project area. An additional 48 independent accuracy checkpoints (27 NVA points and 21 VVA points), 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>The project will support the 3DEP mission, the Natural Resources Conservation Service (NRCS) high resolution elevation enterprise program and the Federal Emergency Management Agency (FEMA) Risk Mapping.</purpose>
			<supplinf>USGS Contract No. G16PC00022, Task Order No. 140G0220F0194. Contractor: Woolpert.</supplinf>
			<lidar>
				<ldrinfo>
					<ldrspec>USGS NGP Base Specifications v2021 rev A</ldrspec>
					<ldrsens>Leica Terrain Mapper</ldrsens>
					<ldrmaxnr>15</ldrmaxnr>
					<ldrnps>0.35</ldrnps>
					<ldrdens>8</ldrdens>
					<ldranps>0.35</ldranps>
					<ldradens>8</ldradens>
					<ldrfltht>1372</ldrfltht>
					<ldrfltsp>160</ldrfltsp>
					<ldrscana>40</ldrscana>
					<ldrscanr>150</ldrscanr>
					<ldrpulsr>1600</ldrpulsr>
					<ldrpulsd>5</ldrpulsd>
					<ldrpulsw>2.5</ldrpulsw>
					<ldrwavel>1064</ldrwavel>
					<ldrmpia>1</ldrmpia>
					<ldrbmdiv>0.25</ldrbmdiv>
					<ldrswatw>1456</ldrswatw>
					<ldrswato>25</ldrswato>
					<ldrgeoid>GEOID18</ldrgeoid>
				</ldrinfo>
				<ldraccur>
					<ldrchacc>0</ldrchacc>
					<rawnva>0</rawnva>
					<rawnvan>0</rawnvan>
					<clsnva>0</clsnva>
					<clsnvan>27</clsnvan>
					<clsvva>0</clsvva>
					<clsvvan>21</clsvvan>
				</ldraccur>
				<lasinfo>
					<lasver>1.4</lasver>
					<lasprf>6</lasprf>
					<laswheld>Geometrically unreliable points were identified using a combination of automated and manual techniques and subsequently classified as high or low noise and given the standard Withheld bit.</laswheld>
					<lasolap>Swath "overage" points were identified in these files using the standard LAS overlap bit.</lasolap>
					<lasintr>16</lasintr>
					<lasclass>
						<clascode>1</clascode>
						<clasitem>Processed but not classified</clasitem>
					</lasclass>
					<lasclass>
						<clascode>2</clascode>
						<clasitem>Bare earth ground</clasitem>
					</lasclass>
					<lasclass>
						<clascode>7</clascode>
						<clasitem>Noise</clasitem>
					</lasclass>
					<lasclass>
						<clascode>9</clascode>
						<clasitem>Water</clasitem>
					</lasclass>
					<lasclass>
						<clascode>17</clascode>
						<clasitem>Bridge decks</clasitem>
					</lasclass>
					<lasclass>
						<clascode>18</clascode>
						<clasitem>High noise</clasitem>
					</lasclass>
					<lasclass>
						<clascode>20</clascode>
						<clasitem>Ignored ground</clasitem>
					</lasclass>
				</lasinfo>
			</lidar>
		</descript>
		<timeperd>
			<timeinfo>
				<rngdates>
					<begdate>20210307</begdate>
					<enddate>20210413</enddate>
				</rngdates>
			</timeinfo>
			<current>ground condition</current>
		</timeperd>
		<status>
			<progress>Complete</progress>
			<update>None planned</update>
		</status>
		<spdom>
			<bounding>
				<westbc>-82.7783961812653</westbc>
				<eastbc>-81.6870815306677</eastbc>
				<northbc>39.7330727933069</northbc>
				<southbc>38.8735000242785</southbc>
			</bounding>
			<lboundng>
				<leftbc>1889999.99999999</leftbc>
				<rightbc>2198750</rightbc>
				<topbc>631249.999999987</topbc>
				<bottombc>318749.999999991</bottombc>
			</lboundng>
		</spdom>
		<keywords>
			<theme>
				<themekt>None</themekt>
				<themekey>Lidar</themekey>
				<themekey>Classified LAS</themekey>
				<themekey>Elevation Data</themekey>
				<themekey>LAS Point Cloud</themekey>
				<themekey>Remote Sensing</themekey>
			</theme>
			<place>
				<placekt>None</placekt>
				<placekey>United States</placekey>
				<placekey>Ohio</placekey>
				<placekey>Athens County</placekey>
				<placekey>Meigs County</placekey>
				<placekey>Perry County</placekey>
				<placekey>Pickaway County</placekey>
				<placekey>Ross County</placekey>
				<placekey>Vinton County</placekey>
				<placekey>Washington 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 Version 1803 (Build 17134.1304); ArcMap 10.7; ArcCatalog 10.7; TerraScan ver. 20; TerraModeler ver. 20; LP360 v2019.1.30.4.</native>
	</idinfo>
	<dataqual>
		<logic>Data covers the entire area specified for this project.</logic>
		<complete>These LAS data files include all data points collected. No points have been removed or excluded. A visual qualitative assessment was performed to ensure data completeness. No void areas or missing data exist.</complete>
		<posacc>
			<horizpa>
				<horizpar>The data set was produced to meet ASPRS "Positional Accuracy Standards for Digital Geospatial Data" (2014) for a 0.101 ft RMSEx / RMSEy Horizontal Accuracy Class which equates to Positional Horizontal Accuracy = +/- 0.250 ft at a 95% confidence level.</horizpar>
			</horizpa>
			<vertacc>
				<vertaccr>This project required Non-Vegetated Vertical Accuracy (NVA) and Vegetated Vertical Accuracy (VVA) to be tested on the classified lidar point cloud data. The dataset was required to meet a target NVA value of 19.6 cm at a 95% confidence level using an RMSEz target value of 10 cm x 1.9600 and a target VVA value of 30 cm at the 95th percentile. Testing was assessed and reported using guidelines developed by the National Digital Elevation Program (NDEP) and the American Society for Photogrammetry and Remote Sensing (ASPRS).
					The NVA and VVA values were calculated using independent checkpoints that were not used in the calibration or post processing of the lidar point cloud data. Checkpoints were distributed throughout the project area. NVA checkpoints were located in bare earth and urban (non-vegetated) land cover classes. VVA checkpoints were located in brush/tall grass/weeds (vegetated) land cover classes. These checkpoints were surveyed using GPS techniques. See the survey report for acquisition methodologies.
					Testing was performed using TINs created from the final calibrated and controlled swath data. For each NVA checkpoint, an elevation value was derived from the TIN at the point's x,y location. This value was compared to the checkpoint's surveyed elevation value.
				This data set was produced to meet ASPRS Positional Accuracy Standard for Digital Geospatial Data (2014) fora 10-cm RMSEz Vertical Accuracy Class.</vertaccr>      
				<qvertpa>
					<vertaccv>0</vertaccv>
					<vertacce>Tested 0 meters NVA at a 95% confidence level using RMSE(z) 10 cm x 1.9600 as defined by the National Standard for Spatial Data Accuracy (NSSDA). The NVA of the classified point cloud was calculated against TINs derived from the final calibrated and controlled swath data using 27 independent checkpoints located in non-vegetated land cover categories.</vertacce>
				</qvertpa>
				<qvertpa>
					<vertaccv>0</vertaccv>
					<vertacce>Tested 0 meters VVA was calculated using 21 checkpoints located in vegetated land cover categories at the 95th percentile, derived according to ASPRS Guidelines, Vertical Accuracy Reporting for Lidar Data. Tested against the DEM.</vertacce>
				</qvertpa>
			</vertacc>
		</posacc>
		<lineage>
			<procstep>
				<procdesc>Lidar Point Cloud Classification: The point cloud underwent a classification process to determine bare-earth points and non-ground points utilizing "first and only" as well as "last of many" lidar returns. This process determined Processed, but Unclassified (Class 1), Bare Earth Ground (Class 2), Low Noise (Class 7), Water (Class 9), Bridge Decks (Class 17), High Noise (Class 18), and Ignored Ground (Class 20). The bare-earth (Class 2 - Ground) lidar points underwent a manual QA/QC step to verify the quality of the DEM as well as a peer-based QC review. This included a review of the DEM surface to remove artifacts and ensure topographic quality. After the bare-earth surface is finalized, it is then used to generate all hydro-breaklines through a semi-automated process. All ground (Class 2) lidar data inside of the Lake Pond and Double Line Drain hydro flattening breaklines were then classified to water (Class 9) using TerraScan/LP360 macro functionality. A buffer of 0.7 meters was also used around each hydro-flattened feature to classify these ground (Class 2) points to Ignored Ground (Class 20). All Lake Pond Island and Double Line Drain Island features were checked to ensure that the ground (Class 2) points were reclassified to the correct classification after the automated classification was completed. These processes were reviewed and accepted by USGS through numerous conference calls and pilot study areas. All data was manually reviewed and any remaining artifacts removed using functionality provided by TerraScan and TerraModeler. Global Mapper was used as a final check of the bare earth dataset. GeoCue was then used to create the deliverable industry-standard LAS files. Woolpert proprietary software and LP360 was used to perform final statistical analysis of the classes in the LAS files, on a per tile level to verify final classification metrics and full LAS header information.</procdesc>
				<procdate>20211129</procdate>
			</procstep>
		</lineage>
	</dataqual>
	<spdoinfo>
		<direct>Point</direct>
	</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>coordinate pair</plance>
					<coordrep>
						<absres>0.01</absres>
						<ordres>0.01</ordres>
					</coordrep>
					<plandu>survey feet</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>survey feet</altunits>
				<altenc>Explicit elevation coordinate included with horizontal coordinates</altenc>
			</altsys>
		</vertdef>
	</spref>
	<metainfo>
		<metd>20211129</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>