<?xml version="1.0" encoding="UTF-8"?>
<metadata>
	<idinfo>
		<citation>
			<citeinfo>
				<origin>Aero-Graphics</origin>
				<pubdate>20191030</pubdate>
				<title>DCS Terrain Submission for Dawson County MT</title>
				<geoform>FEMA-DCS-Terrain</geoform>
				<pubinfo>
					<pubplace>Salt Lake City, UT</pubplace>
					<publish>FEMA</publish>
				</pubinfo>
				<onlink>https://hazards.fema.gov</onlink>
				<lworkcit>
					<citeinfo>
						<origin>Federal Emergency Management Agent</origin>
						<pubdate>20191030</pubdate>
						<title>FEMA Fund No. 03094</title>
					</citeinfo>
				</lworkcit>
			</citeinfo>
		</citation>
		<descript>
			<abstract>
			LiDAR was collected at a 0.7 meter nominal post spacing for approximately 1,919 square miles of Dawson County, Montana. Data was acquired during leaf-off conditions while no snow was on the ground and rivers were at or below normal levels. The project area required a 0.7 meter nominal post spacing and a 10cm Non-vegetated Vertical Accuracy.
			</abstract>
			<purpose>
			Lifts are planned to meet project specifications and are flown under cloud-free conditions in order to collect LIDAR points at an average of 0.7 meter point spacing. This allows the user to create bare earth models, 2ft contours, and fully Classified LiDAR LAS files.
			</purpose>
		</descript>
		<timeperd>
			<timeinfo>
				<rngdates>
					<begdate>20190419</begdate>
					<enddate>20190510</enddate>
				</rngdates>
			</timeinfo>
			<current>20190510</current>
		</timeperd>
		<status>
			<progress>Complete</progress>
			<update>Unknown</update>
		</status>
		<spdom>
			<bounding>
				<westbc>-105.456569</westbc>
				<eastbc>-104.235001</eastbc>
				<northbc>47.796958</northbc>
				<southbc>46.844240</southbc>
			</bounding>
		</spdom>
		<keywords>
			<theme>
				<themekt>ISO19915 Topic Category</themekt>
				<themekey>elevation</themekey>
			</theme>
			<theme>
				<themekt>FEMA NFIP Topic Category</themekt>
				<themekey>Relief</themekey>
				<themekey>Topography</themekey>
				<themekey>Digital Terrain Model</themekey>
				<themekey>Elevation Data</themekey>
				<themekey>Slope</themekey>
				<themekey>LIDAR</themekey>
				<themekey>Contours</themekey>
				<themekey>DEM</themekey>
			</theme>
			<place>
				<placekt>None</placekt>
				<placekey>REGION 08</placekey>
				<placekey>STATE MT</placekey>
				<placekey>COUNTY Dawson County</placekey>
                <placekey>COUNTY-FIPS 30021</placekey>
                <placekey>COMMUNITY Dawson County</placekey>
				<placekey>FEMA-CID 300140</placekey>
                <placekey>HYDROLOGIC UNIT 10100004</placekey>
			</place>
		</keywords>
		<accconst>None</accconst>
		<useconst>
		Acknowledgement of FEMA would be appreciated in products
		derived from these data. This digital data is produced for the purposes of
		updating/creating a DFIRM database.
		</useconst>
	</idinfo>
	<dataqual>
		<logic>
		Deliverables were tested by Aero-Graphics for both vertical and horizontal accuracy. 
		All data is seamless from one tile to the next, no gaps or no data areas in the three project areas.
		</logic>
		<complete>Datasets contain complete coverage of tiles.</complete>
		<posacc>
			<vertacc>
				<vertaccr>Deliverables were tested by Aero-Graphics for both vertical and horizontal 
 			    	accuracy. All data is seamless from one tile to the next, no gaps or no data areas in the three project areas. 
    			The vertical unit of the data file is in decimal feet with 2-decimal point precision.</vertaccr>
				<qvertpa>
					<vertaccv>0.432</vertaccv>
					<vertacce> Final 1.96 RMSE in feet of non vegetated ground check points witheld from the calibration and post processing of the LiDAR point cloud within the Dawson County project site.</vertacce>
				</qvertpa>
			</vertacc>
		</posacc>
		<lineage>
			<srcinfo>
				<srccite>
					<citeinfo>
						<origin>Aero-Graphics</origin>
						<pubdate>2019</pubdate>
						<title>LIDAR</title>						
					</citeinfo>
				</srccite>
				<typesrc>hard drive</typesrc>
				<srctime>
					<timeinfo>
						<sngdate>
							<caldate>20190510</caldate>
						</sngdate>
					</timeinfo>	
					<srccurr>ground condition</srccurr>
				</srctime>
				<srccitea>CONTOURS</srccitea>
				<srccontr>LiDAR points were used to produce the deliverables.</srccontr>
			</srcinfo>
      			<procstep>
				<procdesc>1. Flight lines and data were reviewed to ensure complete coverage of the study area and positional accuracy of the laser points.
				2. Laser point return coordinates were computed using Waypoint Inertial Explorer based on independent data from the LiDAR system, IMU, and aircraft.
				3. The raw LiDAR file was assembled into flight lines per return with each point having an associated x, y, and z coordinate.
				4. Visual inspection of swath to swath laser point consistencies within the study area were used to perform manual refinements of system alignment.
				5. Custom algorithms were designed to evaluate points between adjacent flight lines. Automated system alignment was computed based upon randomly selected swath to
				swath accuracy measurements that consider elevation, slope, and intensities. Specifically, refinement in the combination of system pitch, roll and yaw offset parameters
				optimize internal consistency.
				6. Noise (e.g., pits and birds) was filtered using postprocessing software, based on known elevation ranges and included the removal of any cycle slips.
				7. Using TerraScan and Microstation, ground classifications utilized custom settings appropriate to the study area. 
				8. The corrected and filtered return points were compared
				to the RTK ground survey points collected to verify the vertical accuracy.
				</procdesc>
				<procdate>2019</procdate>
			</procstep>
		</lineage>
	</dataqual>
	<spref>
		<horizsys>
			<planar>
				<gridsys>
					<gridsysn>State Plane Coordinate System 1983</gridsysn>
					<spcs>
						<spcszone>2500</spcszone>
						<lambertc>
							<stdparll>45.0</stdparll>
							<longcm>-109.5</longcm>
							<latprjo>44.25</latprjo>
							<feast>1968503.937007874</feast>
							<fnorth>0.0</fnorth>
						</lambertc>
					</spcs>
				</gridsys>
				<planci>
					<plance>row and column</plance>
					<coordrep>
						<absres>0.01</absres>
						<ordres>0.01</ordres>
					</coordrep>
					<plandu>Intl. feet</plandu>
				</planci>
			</planar>
			<geodetic>
				<horizdn>North American Datum of 1983 (2011)</horizdn>
				<ellips>Geodetic Reference System 80</ellips>
				<semiaxis>6378137.000000</semiaxis>
				<denflat>298.257222101</denflat>
			</geodetic>
		</horizsys>
		<vertdef>
			<altsys>
				<altdatum>North American Vertical Datum of 1988</altdatum>
				<altres>0.01</altres>
				<altunits>US feet</altunits>
				<altenc>Attribute values</altenc>
			</altsys>
		</vertdef>
	</spref>
	<eainfo>
		<detailed>
			<enttyp>
				<enttypl>S_Submittal_Info</enttypl>
				<enttypd>A spatial data set consisting of polygons depicting the extents of the studied area.</enttypd>
				<enttypds>FEMA FIRM Database Technical Reference available at http://www.fema.gov/media-library/assets/documents/32363?id=7417 and on the FEMA RiskMAP Knowledge Sharing Site</enttypds>
			</enttyp>
		</detailed>
		<detailed>
			<enttyp>
				<enttypl>Bare Earth DEM</enttypl>
				<enttypd>An elevation model where bare-earth elevation values have regularly spaced intervals (x and y).</enttypd>
				<enttypds>FEMA Guidelines and Standards for Flood Risk Analysis and Mapping (available on the FEMA Risk MAP Knowledge Sharing Site)</enttypds>
			</enttyp>
			
		</detailed>
		<detailed>
			<enttyp>
				<enttypl>Classified Point Cloud Data</enttypl>
				<enttypd>The final processing and classification of LiDAR data to the required ASPRS LAS classes, per project specifications. This includes testing for Non-vegetated Vertical Accuracy (NVA).</enttypd>
				<enttypds>FEMA Guidelines and Standards for Flood Risk Analysis and Mapping (available on the FEMA Risk MAP Knowledge Sharing Site)</enttypds>
			</enttyp>
		</detailed>
		<detailed>
			<enttyp>
				<enttypl>Tiling Index</enttypl>
				<enttypd>A spatial dataset that describes the tiling system used for multiple files of the same type.</enttypd>
				<enttypds>FEMA Guidelines and Standards for Flood Risk Analysis and Mapping (available on the FEMA Risk MAP Knowledge Sharing Site)</enttypds>
			</enttyp>
		</detailed>
		<overview>
			<eaover>The Light Detection and Ranging (LiDAR) dataset is a survey of approximately 1,919 square miles focusing on Dawson County, MT. The terrain data package is made up of several data themes containing primarily spatial information. These data supplement elevation datasets by providing additional information to aid flood risk evaluation and flood hazard area delineation.</eaover>
			<eadetcit>The Light Detection and Ranging (LiDAR) dataset is a survey of approximately 1,919 square miles focusing on Dawson County, MT. The terrain data package is made up of several data themes containing primarily spatial information. These data supplement elevation datasets by providing additional information to aid flood risk evaluation and flood hazard area delineation.</eadetcit>
		</overview>
	</eainfo>
	<distinfo>
		<distrib>
			<cntinfo>
				<cntorgp>
					<cntorg>FEMA</cntorg>
				</cntorgp>
				<cntaddr>
					<addrtype>mailing address</addrtype>
					<address>500 C Street, S.W.</address>
					<city>Washington</city>
					<state>District of Columbia</state>
					<postal>20472</postal>
					<country>USA</country>
				</cntaddr>
				<cntvoice>1-877-336-2627</cntvoice>
				<cntemail>miphelp@riskmapcds.com</cntemail>
			</cntinfo>
		</distrib>
		<distliab>No warranty expressed or implied is made by FEMA
			regarding the utility of the data on any other system nor 
			shall the act of distribution constitute any such warranty.</distliab>
		<stdorder>
			<digform>
				<digtinfo>
					<formname>FEMA-DCS-Terrain</formname>
				</digtinfo>
				<digtopt>
					<onlinopt>
						<computer>
							<networka>
								<networkr>http://hazards.fema.gov</networkr>
							</networka>
						</computer>
					</onlinopt>
				</digtopt>
			</digform>
			<fees>Contact Distributor</fees>
		</stdorder>
	</distinfo>
	<metainfo>
		<metd>20191030</metd>
		<metc>
			<cntinfo>
				<cntperp>
					<cntper>Kelly Francis</cntper>
					<cntorg>Aero-Graphics</cntorg>
				</cntperp>
				<cntpos>Project Manager</cntpos>
				<cntaddr>
					<addrtype>mailing and physical</addrtype>
					<address>40 W Oakland Ave</address>
					<city>Salt Lake City</city>
					<state>UT</state>
					<postal>84105</postal>
					<country>USA</country>
				</cntaddr>
				<cntvoice>801-487-3273</cntvoice>
				<cntemail>kfrancis@aero-graphics.com</cntemail>
			</cntinfo>
		</metc>
		<metstdn>FGDC Content Standard for Digital Geospatial Metadata</metstdn>
		<metstdv>FGDC-STD-001-1998</metstdv>
		<metextns>
			<onlink>http://hazards.fema.gov</onlink>
			<onlink>http://www.epsg.org</onlink>
			<metprof>FEMA NFIP Metadata Content and Format Standard</metprof>
		</metextns>
	</metainfo>
</metadata>