<!DOCTYPE metadata SYSTEM "http://fgdc.gov/metadata/fgdc-std-001-1998.dtd">
<metadata>
	<idinfo>
		<citation>
			<citeinfo>
				<origin>Quantum Spatial</origin>
				<pubdate>20161205</pubdate>
				<title>
					Lidar data for Dauphin County, Pennsylvania
					USGS Contract: G10PC00016  Task Order Number: G16PD00443
					PA_DauphinCounty_QL2_2016
				</title>
				<geoform>Lidar point cloud</geoform>
			</citeinfo>
		</citation>
		<descript>
		<abstract>
			Geographic Extent: Dauphin County, Pennsylvania, covering approximately 555 square miles. 
			Dataset Description: The Dauphin County, PA 2016 QL2 LiDAR project called for the planning, acquisition, processing and derivative products of LIDAR data to be collected  at a nominal pulse spacing (NPS) of 0.7 meters. Project specifications are based on the U.S. Geological Survey National Geospatial Program Base LIDAR Specification, Version 1.2. The data was developed based on a horizontal projection/datum of NAD83 (2011) State Plane Pennsylvania South Zone, US survey feet; NAVD1988 (Geoid 12B), US survey feet. LiDAR data was delivered in RAW flight line swath format, processed to create Classified LAS 1.4 Files formatted to 711 individual 5,000-foot x 5,000-foot tiles. Tile names use the following naming schema: "YYYYXXXXPAd" where YYYY is the first 3 characters of the tile's upper left corner Y-coordinate, XXXX - the first 4 characters of the tile's upper left corner X-coordinate, PA = Pennsylvania, and d = 'N' for North or 'S' for South. Corresponding 2.5-foot gridded hydro-flattened bare earth raster tiled DEM files and intensity image files were created using the same 5,000-foot x 5,000-foot schema. Hydro-flattened breaklines were produced in Esri file geodatabase format. Continuous 2-foot contours were produced in Esri file geodatabase format.
			Ground Conditions: LiDAR collection began in Spring 2016, 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, Quantum Spatial established a total of 84 control points (24 calibration control points and 60 QC checkpoints). These were used to calibrate the LIDAR to known ground locations established throughout the project area.
		</abstract>
		<purpose>
			Classified LAS files are used to show the manually reviewed bare earth surface.  This allows the user to create breaklines and raster DEMs. 
			The purpose of these lidar data was to produce high accuracy 3D hydro-flattened digital elevation model (DEM) with a 2.5-foot cell size.
			These raw lidar point cloud data were used to create classified lidar LAS files, intensity images, 3D breaklines, hydro-flattened DEMs, and contours as necessary.
			A four-tile area around Three Mile Island required a re-flight. Steam plumes over the area limited the amount of points returned, resulting in voids in the data set. Data falling within the following tiles was re-acquired on November 22, 2016: 30502250PAS, 30502255PAS, 30002250PAS, and 30002255PAS.
		</purpose>
		<lidar>
			<ldrinfo>
				<ldrspec>USGS-NGP Base Specification v1.2</ldrspec>
				<ldrsens>Leica_ALS_70</ldrsens>
				<ldrmaxnr>3</ldrmaxnr>
				<ldrnps>0.67</ldrnps>
				<ldrdens>2.26</ldrdens>
				<ldranps>0.67</ldranps>
				<ldradens>2.26</ldradens>
				<ldrfltht>2075</ldrfltht>
				<ldrfltsp>150</ldrfltsp>
				<ldrscana>40</ldrscana>
				<ldrscanr>53.4</ldrscanr>
				<ldrpulsr>263.4</ldrpulsr>
				<ldrpulsd>4</ldrpulsd>
				<ldrpulsw>0.47</ldrpulsw>
				<ldrwavel>1064</ldrwavel>
				<ldrmpia>1</ldrmpia>
				<ldrbmdiv>0.25</ldrbmdiv>
				<ldrswatw>1510.48</ldrswatw>
				<ldrswato>12.34</ldrswato>
				<ldrgeoid>g2012bu0.bin</ldrgeoid>
			</ldrinfo>
			<ldrinfo_7161>
				<ldrspec>USGS-NGP Base Specification v1.2</ldrspec>
				<ldrsens>Leica_ALS_70</ldrsens>
				<ldrmaxnr>3</ldrmaxnr>
				<ldrnps>0.68</ldrnps>
				<ldrdens>2.14</ldrdens>
				<ldranps>0.68</ldranps>
				<ldradens>2.14</ldradens>
				<ldrfltht>2100</ldrfltht>
				<ldrfltsp>155</ldrfltsp>
				<ldrscana>40</ldrscana>
				<ldrscanr>53.4</ldrscanr>
				<ldrpulsr>260.4</ldrpulsr>
				<ldrpulsd>4</ldrpulsd>
				<ldrpulsw>0.48</ldrpulsw>
				<ldrwavel>1064</ldrwavel>
				<ldrmpia>1</ldrmpia>
				<ldrbmdiv>0.25</ldrbmdiv>
				<ldrswatw>1528.67</ldrswatw>
				<ldrswato>10.72</ldrswato>
				<ldrgeoid>g2012bu0.bin</ldrgeoid>
			</ldrinfo_7161>
			<ldraccur>
				<ldrchacc>0.196</ldrchacc>
				<rawnva>0.059</rawnva>
				<rawnvan>35</rawnvan>
				<clsnva>0.053</clsnva>
				<clsnvan>35</clsnvan>
				<clsvva>0.078</clsvva>
				<clsvvan>25</clsvvan>
			</ldraccur>
			<lasinfo>
				<lasver>1.4</lasver>
				<lasprf>6</lasprf>
				<laswheld>Withheld (ignore) points were identified in these files using the standard LAS 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 unclassified</clasitem>
				</lasclass>
				<lasclass>
					<clascode>2</clascode>
					<clasitem>Bare-earth ground</clasitem>
				</lasclass>
				<lasclass>
					<clascode>7</clascode>
					<clasitem>Low noise</clasitem>
				</lasclass>
				<lasclass>
					<clascode>8</clascode>
					<clasitem>Model Key</clasitem>
				</lasclass>
				<lasclass>
					<clascode>9</clascode>
					<clasitem>Water</clasitem>
				</lasclass>
				<lasclass>
					<clascode>10</clascode>
					<clasitem>Ignored Ground</clasitem>
				</lasclass>
				<lasclass>
					<clascode>17</clascode>
					<clasitem>Bridge Decks</clasitem>
				</lasclass>
				<lasclass>
					<clascode>18</clascode>
					<clasitem>High noise</clasitem>
				</lasclass>
			</lasinfo>
		</lidar>
		<supplinf>
			USGS Contract: G10PC00016  Task Order Number: G16PD00443
			CONTRACTOR: Quantum Spatial
			Lidar data were acquired and calibrated by Quantum Spatial.
			All follow-on processing was completed by the prime contractor.
		</supplinf>
		</descript>
		<timeperd>
			<timeinfo>
				<rngdates>
					<begdate>20160324</begdate>
					<enddate>20161122</enddate>
				</rngdates>
		    </timeinfo>
			<current>ground condition</current>
		</timeperd>
		<status>
			<progress>Complete</progress>
			<update>None planned</update>
		</status>
		<spdom>
			<bounding>
				<westbc>-77.0447212896727</westbc>
				<eastbc>-76.5208427032109</eastbc>
				<northbc>40.6738130223421</northbc>
				<southbc>40.1109641653215</southbc>
			</bounding>
			<lboundng>
				<leftbc>2165000.000000</leftbc>
				<rightbc>2310000.000000</rightbc>
				<topbc>490000.000000</topbc>
				<bottombc>285000.000000</bottombc>
			</lboundng>
		</spdom>
		<keywords>
			<theme>
				<themekt>None</themekt>
				<themekey>Elevation data</themekey>
				<themekey>Lidar</themekey>
				<themekey>Hydrology</themekey>
			</theme>
			<place>
				<placekt>None</placekt>
				<placekey>United States</placekey>
				<placekey>US</placekey>
				<placekey>Pennsylvania</placekey>
				<placekey>PA</placekey>
				<placekey>Dauphin County</placekey>
			</place>
		</keywords>
		<accconst>No restrictions apply to this 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.
		</useconst>
		<ptcontac>
			<cntinfo>
				<cntorgp>
					<cntorg>Quantum Spatial, Data Acquisition Department</cntorg>
					<cntper>Chris Holder</cntper>
				</cntorgp>
				<cntaddr>
					<addrtype>mailing and physical</addrtype>
					<address>523 Wellington Way</address>
					<city>Lexington</city>
					<state>KY</state>
					<postal>40503</postal>
					<country>USA</country>
				</cntaddr>
				<cntvoice>859-277-8700</cntvoice>
				<cntfax>859-277-8901</cntfax>
				<cntemail>cholder@quantumspatial.com</cntemail>
				<hours>Monday through Friday 8:00 AM to 5:00 PM (Eastern Time)</hours>
				<cntinst>If unable to reach the contact by telephone, please send an email. You should get a response within 24 hours.</cntinst>
			</cntinfo>
		</ptcontac>
		<native>
			MicroStation Version 8; TerraScan Version 15; TerraModeler Version 15; GeoCue Version 2014.1.21.1; Esri ArcGIS 10; Global Mapper 16; Leica Cloud Pro 1.2; Windows 7 Operating System
			\\PSIHQ_NX3200\Projects\Projects\28552_USGS_Dauphin_Co 1.11 GB and \\matrix\matrix\LIDAR\28552_USGS_Dauphin_Co_PA_3DEP_BAA 816 GB
		</native>
	</idinfo>
	<dataqual>
		<logic>Data cover the entire area specified for this project.</logic>
		<complete>
			These raw 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. The raw point cloud is of good quality and data passes Nonvegetated Vertical Accuracy specifications.
		</complete>
		<posacc>
			<vertacc>
				<vertaccr>
					The specifications require that only raw Nonvegetated Vertical Accuracy (NVA) be computed for raw lidar point cloud swath files. The raw NVA was tested with 35 independent survey points distributed throughout the project area and located in open terrain. These checkpoints were not used in the calibration or post-processing of the lidar point cloud data. Specifications for this project require that the raw NVA be 19.6 cm or better AccuracyZ at 95 percent confidence level.
				</vertaccr>
				<qvertpa>
					<vertaccv>0.059<!--meters; raw NVA at 95 percent Confidence Interval--></vertaccv>
					<vertacce>
						The raw NVA was tested using 35 independent survey points located in open terrain. The surveyed checkpoints were distributed throughout the project area and surveyed using GNSS procedures and methodologies that provide reliable and consistent results to meet the project's accuracy requirements. Please see the "Survey Accuracy Requirements" and "Field Methodology" sections in the Survey Report for more information. Elevations from the unclassified lidar surface were measured for the x,y location of each check point. Elevations interpolated from the unclassified lidar surface were then compared to the elevation values of the surveyed control. The RMSEz was computed to be 0.099 meters (0.030 feet) and AccuracyZ to be 0.193 meters (0.059 feet). This meets the required AccuracyZ value of 19.6 cm raw NVA at 95 percent confidence level using (RMSEz * 1.9600) as defined by the National Standards for Spatial Data Accuracy (NSSDA); assessed and reported using National Digital Elevation Program (NDEP)/ASPRS Guidelines.
					</vertacce>
				</qvertpa>
				</vertacc>
		</posacc>
		<lineage>
			<srcinfo>
				<srccite>
					<citeinfo>
						<origin>Quantum Spatial</origin>
						<pubdate>20161205</pubdate>
						<title>Survey Report of LiDAR Ground Control Points: Dauphin County, PA LiDAR Task Order</title>
						<pubinfo>
							<pubplace>Lexington, KY</pubplace>
							<publish>Quantum Spatial</publish>
						</pubinfo>
					</citeinfo>
				</srccite>
				<typesrc>online</typesrc>
				<srctime>
					<timeinfo>
						<sngdate>
							<caldate>2016</caldate>
						</sngdate>
					</timeinfo>
					<srccurr>ground condition</srccurr>
				</srctime>
				<srccitea>PA_DauphinCounty_QL2_2016_LiDAR_gnd_ctrl</srccitea>
				<srccontr>This data source was used (along with the airborne GPS/IMU Data) to aid in the georeferencing of the lidar point cloud data.</srccontr>
			</srcinfo>
			<srcinfo>
				<srccite>
					<citeinfo>
						<origin>Quantum Spatial</origin>
						<pubdate>20161205</pubdate>
						<title>Lidar RAW Data for Dauphin County, PA QL2 2016</title>
						<geoform>Lidar point cloud</geoform>
						<pubinfo>
							<pubplace>Quantum Spatial</pubplace>
							<publish>2016</publish>
						</pubinfo>
					</citeinfo>
				</srccite>
				<typesrc>online</typesrc>
				<srctime>
					<timeinfo>
						<rngdates>
							<begdate>20160324</begdate>
							<enddate>20161122</enddate>
						</rngdates>
					</timeinfo>
					<srccurr>ground condition</srccurr>
				</srctime>
				<srccitea>PA_DauphinCounty_QL2_2016_LiDAR_Data</srccitea>
				<srccontr>This data source was used to populate the lidar point cloud data.</srccontr>
			</srcinfo>
			<srcinfo>
				<srccite>
					<citeinfo>
						<origin>Quantum Spatial</origin>
						<pubdate>20161205</pubdate>
						<title>Control Survey Report of LiDAR Quality Control Points: Dauphin County, PA Lidar Task Order</title>
						<pubinfo>
							<pubplace>Lexington, KY</pubplace>
							<publish>Quantum Spatial</publish>
						</pubinfo>
					</citeinfo>
				</srccite>
				<typesrc>online</typesrc>
				<srctime>
					<timeinfo>
						<sngdate>
							<caldate>2016</caldate>
						</sngdate>
					</timeinfo>
					<srccurr>ground condition</srccurr>
				</srctime>
				<srccitea>PA_DauphinCounty_QL2_2016_LiDAR_qc_ctrl</srccitea>
				<srccontr>This data source was used to QC and vertically adjust the lidar point cloud data.</srccontr>
			</srcinfo>
			<procstep>
				<procdesc>
				    Classified LAS Creation:
				    The bare earth surface is then manually reviewed to ensure correct classification on the Class 2 (Ground) points.  After the bare-earth surface is finalized, it is then used to generate all hydro-breaklines through heads-up digitization.
				    All ground (ASPRS Class 2) LiDAR data inside of the Lake Pond and Double Line Drain hydro flattening breaklines were then classified to water (ASPRS Class 9) using TerraScan macro functionality.  A buffer of 3 feet was also used around each hydro-flattened feature to classify these ground (ASPRS Class 2) points to Ignored ground (ASPRS Class 10).  All Lake Pond Island and Double Line Drain Island features were checked to ensure that the ground (ASPRS Class 2) points were reclassified to the correct classification after the automated classification was completed.  All bridge decks were classified to Class 17.
				    All overlap data was processed through automated functionality provided by TerraScan to classify the overlapping flight line data to approved classes by USGS.  The overlap data was identified using the Overlap Flag, per LAS 1.4 specifications.
				    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 for both the All Point Cloud Data and the Bare Earth.  Quantum Spatial proprietary software 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>
				<srcused>PA_DauphinCounty_QL2_2016_LiDAR_qc_ctrl</srcused>
				<srcused>PA_DauphinCounty_QL2_2016_LiDAR_Data</srcused>
				<procdate>2016</procdate>
				<srcprod>Classified LAS</srcprod>
				<proccont>
					<cntinfo>
						<cntorgp>
							<cntorg>Quantum Spatial</cntorg>
							<cntper>Ryan Griffin</cntper>
						</cntorgp>
						<cntaddr>
							<addrtype>mailing and physical</addrtype>
							<address>523 Wellington Way</address>
							<city>Lexington</city>
							<state>KY</state>
							<postal>40503</postal>
							<country>USA</country>
						</cntaddr>
						<cntvoice>859-277-8700</cntvoice>
						<cntfax>859-277-8901</cntfax>
						<cntemail>rgriffin@quantumspatial.com</cntemail>
						<hours>Monday through Friday 8:00 AM to 5:00 PM (Eastern Time)</hours>
						<cntinst>If unable to reach the contact by telephone, please send an email. You should get a response within 24 hours.</cntinst>
					</cntinfo>
				</proccont>
			</procstep>
			</lineage>
	</dataqual>
	<spdoinfo>
		<direct>Point</direct>
		<ptvctinf>
			<sdtsterm>
				<sdtstype>Point</sdtstype>
			</sdtsterm>
		</ptvctinf>
	</spdoinfo>
	<spref>
		<horizsys>
			<planar>
				<gridsys>
					<gridsysn>State Plane Coordinate System 1983</gridsysn>
					<spcs>
						<spcszone>3702</spcszone>
						<lambertc>
							<stdparll>39.93333333333333</stdparll>
							<stdparll>40.96666666666667</stdparll>
							<longcm>-77.75</longcm>
							<latprjo>39.33333333333334</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 80</ellips>
				<semiaxis>6378137.0</semiaxis>
				<denflat>298.257222101</denflat>
			</geodetic>
		</horizsys>
		<vertdef>
			<altsys>
				<altdatum>North American Vertical Datum of 1988 (Geoid 12B)</altdatum>
				<altres>0.01</altres>
				<altunits>feet</altunits>
				<altenc>Explicit elevation coordinate included with horizontal coordinates</altenc>
			</altsys>
		</vertdef>
	</spref>
	<metainfo>
		<metd>20161205</metd>
		<metc>
			<cntinfo>
				<cntorgp>
					<cntorg>Quantum Spatial</cntorg>
					<cntper>Sarah Zibart</cntper>
				</cntorgp>
				<cntaddr>
					<addrtype>mailing and physical</addrtype>
					<address>523 Wellington Way</address>
					<city>Lexington</city>
					<state>KY</state>
					<postal>40503</postal>
					<country>USA</country>
				</cntaddr>
				<cntvoice>859-277-8700</cntvoice>
				<cntfax>859-277-8901</cntfax>
				<cntemail>szibart@quantumspatial.com</cntemail>
				<hours>Monday through Friday 8:00 AM to 5:00 PM (Eastern Time)</hours>
				<cntinst>If unable to reach the contact by telephone, please send an email. You should get a response within 24 hours.</cntinst>
			</cntinfo>
		</metc>
		<metstdn>FGDC Content Standard for Digital Geospatial Metadata</metstdn>
		<metstdv>FGDC-STD-001-1998</metstdv>
		<metac>None.</metac>
		<metuc>None.</metuc>
		<metsi>
			<metscs>None.</metscs>
			<metsc>Unclassified</metsc>
			<metshd>NONE</metshd>
		</metsi>
	</metainfo>
</metadata>