<?xml version="1.0"?>
<metadata>
  <idinfo>
    <citation>
      <citeinfo>
        <origin>State of Ohio Office of Information Technology, Ohio Geographically Referenced Information Program</origin>
        <pubdate>20180227</pubdate>
        <title>BN257547.LAS</title>
        <geoform>Lidar point cloud</geoform>
      </citeinfo>
    </citation>
    <descript>
      <abstract>The Summit County, OH Orthoimagery Project will occur twice in two years (2015 &amp; 2017) and will consist of the 
following: 
-	New countywide 1”=50’ scale 8-bit, 4-band (R,G,B,NIR) stacked orthoimagery with a 3-inch pixel resolution 
-	New countywide 1-meter LiDAR 
-	Change detection (2015) 
The project being performed in 2015 &amp; 2017 for Summit County is a countywide orthoimagery update project.   This task is for a high resolution data set of lidar covering the entire Summit County area (approximately 421 square miles). The lidar was collected and processed to meet a maximum Nominal Post Spacing (NPS) of 1 meter. Lidar data is a remotely sensed high resolution elevation data collected by an airborne platform. The lidar sensor uses a combination of laser range finding, GPS positioning, and inertial measurement technologies. The lidar systems collect data point clouds that are used to produce highly detailed Digital Elevation Models (DEMs) of the earth's terrain, man-made structures, and vegetation. The final products include classified LAS 1.2, 2.5 feet pixel raster DEMs of the bare-earth surface in IMG Format, and tile index. Tiled data was delivered in 1,250 ft x 1,250 ft tiles. The file naming convention is as follows: bnxxxyyy (Ohio North Zone); Please note that xxx and yyy represent the easting and northing coordinates (respectively) in state plane feet. Each LAS file contains lidar point information, which has been calibrated, controlled, and classified. Additional deliverables include tile index provided as ESRI shapefile, FGDC metadata files in .xml format. Ground conditions: Water at normal levels; no unusual inundation; no snow; leaf off.
</abstract>
      <purpose>Summit County, OH has a goal to develop and/or update their existing orthoimagery geospatial dataset for use 
by city agencies, other levels of government, academia, and the general public, and to provide these datasets 
for inclusion to OGRIP. OGRIP is a State of Ohio resource for geographic information technology users. </purpose>
    </descript>
    <timeperd>
      <timeinfo>
        <sngdate>
          <caldate>20171120</caldate>
        </sngdate>
      </timeinfo>
      <current>ground condition</current>
    </timeperd>
    <status>
      <progress>Complete</progress>
      <update>As needed</update>
    </status>
    <spdom>
      <bounding>
        <westbc>-81.450321</westbc>
        <eastbc>-81.445727</eastbc>
        <northbc>41.168107</northbc>
        <southbc>41.164635</southbc>
      </bounding>
    </spdom>
    <keywords>
      <theme>
        <themekt>None</themekt>
        <themekey>Lidar</themekey>
        <themekey>Classified LAS 1.2</themekey>
      </theme>
      <place>
        <placekt>None</placekt>
        <placekey>United States</placekey>
        <placekey>Ohio</placekey>
        <placekey>Summit 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. </useconst>
    <ptcontac>
      <cntinfo>
        <cntorgp>
          <cntorg>OGRIP</cntorg>
        </cntorgp>
        <cntpos>GIS Manager</cntpos>
        <cntaddr>
          <addrtype>mailing and physical address</addrtype>
          <address>77 S. High St. - Rm 1990</address>
          <city>Columbus</city>
          <state>OH</state>
          <postal>43215</postal>
          <country>USA</country>
        </cntaddr>
        <cntvoice>(614) 466-4747</cntvoice>
        <cntfax>(614) 728-5297</cntfax>
        <hours>8:00 a.m. to 5:00 p.m. Eastern Time</hours>
      </cntinfo>
    </ptcontac>
  </idinfo>
  <dataqual>
    <logic>All formatted data cover the entire area specified for this project and are validated using a combination of commercial lidar processing software, GIS software, and proprietary programs to ensure proper formatting and loading prior to delivery.</logic>
    <complete>The lidar data is visually inspected for completeness to ensure that are no void areas or missing data.</complete>
    <posacc>
      <horizpa>
        <horizpar>Produced to meet 2.00 feet horizontal accuracy at 95 percent confidence level.</horizpar>
        <qhorizpa>
          <horizpav>2.00</horizpav>
          <horizpae>Lidar system specifications are available in the project report</horizpae>
        </qhorizpa>
      </horizpa>
      <vertacc>
        <vertaccr>Produced to meet 0.4 feet fundamental vertical accuracy at a 95 percent confidence level, derived according NSSDA, in open terrain using (RMSEz) 0.204 x 1.96 as defined by the National Standards for Spatial Data Accuracy (NSSDA); assessed and report using National Digital Elevation Program (NDEP)/ASPRS Guideline and tested against the TIN using lidar ground points. 16 control points were used in this assessment.</vertaccr>
      </vertacc>
    </posacc>
    <lineage>
      <srcinfo>
        <srccite>
          <citeinfo>
            <origin>Woolpert</origin>
            <pubdate>20180227</pubdate>
            <title>Lidar acquisition</title>
            <pubinfo>
              <pubplace>Dayton, OH</pubplace>
              <publish>Woolpert Geospatial Services</publish>
            </pubinfo>
          </citeinfo>
        </srccite>
        <typesrc>Lidar dataset</typesrc>
        <srctime>
          <timeinfo>
            <sngdate>
              <caldate>20171120</caldate>
            </sngdate>
          </timeinfo>
          <srccurr>ground condition</srccurr>
        </srctime>
        <srccitea>Summit County, OH - 2017 LiDAR Project</srccitea>
        <srccontr>This data set is the project specified acquired point cloud data.</srccontr>
      </srcinfo>
      <srcinfo>
        <srccite>
          <citeinfo>
            <origin>Woolpert</origin>
            <pubdate>20170226</pubdate>
            <title>Lidar deliverable processing</title>
            <pubinfo>
              <pubplace>Dayton, OH</pubplace>
              <publish>Woolpert Geospatial Services</publish>
            </pubinfo>
          </citeinfo>
        </srccite>
        <typesrc>Lidar dataset</typesrc>
        <srctime>
          <timeinfo>
            <sngdate>
              <caldate>20180218</caldate>
            </sngdate>
          </timeinfo>
          <srccurr>ground condition</srccurr>
        </srctime>
        <srccitea>Summit County, OH - 2017 LiDAR Project</srccitea>
        <srccontr>This data set is the project specified lidar deliverables.</srccontr>
      </srcinfo>
      <procstep>
        <procdesc>Using a Leica ALS80 (lidar) system on board Woolpert aircraft, high density data, at a nominal pulse spacing (NPS) of 1 meter, were collected for this task order. Leica Specs- AGL = 11,000ft (3,353m) - Aircraft Speed = 150 Knots, Field of View (Full) = 40 degrees, Pulse Rate = 246 kHz, Scan Rate = 25 Hz, with an average side lap of 25.2%. Multiple returns were recorded for each laser pulse along with an intensity value for each return. One (1) mission was flown on November20, 2017. Woolpert survey crews were onsite, operating a Global Navigation Satellite System (GNSS) Base Station for the airborne GPS support. Specific information regarding latitude, longitude, and ellipsoid height to the L1 phase center is included in the lidar processing report. Data for the task order is referenced to the NAD83(HARN) State Plane Ohio North (FIPS3401) Survey Feet, and NAVD 1988, Survey Feet, GEOID03. The geoid used to reduce satellite derived elevations to orthometric heights was GEOID03. Once the data acquisition and GPS processing phases are complete, the lidar data was processed immediately to verify the coverage had no voids. The GPS and IMU data was post processed using differential and Kalman filter algorithms to derive a best estimate of trajectory. The quality of the solution was verified to be consistent with the accuracy requirements of the project. The SBET was used to reduce the lidar slant range measurements to a raw reflective surface for each flight line. The coverage was classified to extract a bare earth digital elevation model (DEM) and separate last returns. The ALS80 calibration and system performance is verified on a periodic basis using Woolpert's calibration range. The calibration range consists of a large building and runway. The edges of the building and control points along the runway have been located using conventional survey methods. Inertial measurement unit (IMU) misalignment angles and horizontal accuracy are calculated by comparing the position of the building edges between opposing flight lines. The scanner scale factor and vertical accuracy is calculated through comparison of lidar data against control points along the runway. Field calibration is performed on all flight lines to refine the IMU misalignment angles. IMU misalignment angles are calculated from the relative displacement of features within the overlap region of adjacent (and opposing) flight lines. The raw lidar data is reduced using the refined misalignment angles.</procdesc>
        <srcused>Summit County, OH - 2017 LiDAR Project

</srcused>
        <procdate>20171120</procdate>
        <proccont>
          <cntinfo>
            <cntorgp>
              <cntorg>Woolpert, Inc.</cntorg>
            </cntorgp>
            <cntpos>Geospatial Services</cntpos>
            <cntaddr>
              <addrtype>mailing and physical address</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>
            <cntfax>(937) 461-0743</cntfax>
            <hours>8:00 a.m. to 5:00 p.m. Eastern Time</hours>
          </cntinfo>
        </proccont>
      </procstep>
      <procstep>
        <procdesc>The individual flight lines were inspected to ensure the systematic and residual errors have been identified and removed. Then, the flight lines were compared to adjacent flight lines for any mismatches to obtain a homogenous coverage throughout the project area. 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 Default (Class 1), Ground (Class 2), Low Vegetation (Class 3), Medium Vegetation (Class 4), High Vegetation (Class 5), Buildings (Class 6),  Noise (Class 7), Bridge Decks (Class 13), Overlap Default (Class 17), Overlap Ground (Class 18) classifications. 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. The overlap classes were determined by first identifying the overlapping areas and reclassifying the LAS data by offset from a corridor. This allows the returns located on the edge of the swath to be removed from the bare earth coverage in an effort to produce a more uniform data density. The returns determined to be overlap including overlap default and ground are then applied an overlap flag and reclassified to their respective standard classification value. The surveyed ground control points are used to make vertical adjustments to the data set and to perform the accuracy checks and statistical analysis of the lidar dataset. Supervisory QC monitoring of work in progress and completed editing ensured consistency of classification character and adherence to project requirements across the entire project area. The resulting deliverables for this task order consist of classified LAS file in LAS 1.2 format and 2.5 feet pixel size DEM files in IMG format.</procdesc>
        <srcused>SummitCounty, OH - 2017 LiDAR Project</srcused>
        <procdate>20171120</procdate>
        <proccont>
          <cntinfo>
            <cntorgp>
              <cntorg>Woolpert, Inc.</cntorg>
            </cntorgp>
            <cntpos>Geospatial Services</cntpos>
            <cntaddr>
              <addrtype>mailing and physical address</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>
            <cntfax>(937) 461-0743</cntfax>
            <hours>8:00 a.m. to 5:00 p.m. Eastern Time</hours>
          </cntinfo>
        </proccont>
      </procstep>
    </lineage>
  </dataqual>
  <spdoinfo>
    <direct>Point</direct>
  </spdoinfo>
  <spref>
    <horizsys>
      <planar>
        <mapproj>
          <mapprojn>NAD 1983 HARN StatePlane Ohio North FIPS 3401 Feet</mapprojn>
          <lambertc>
            <stdparll>40.43333333333333</stdparll>
            <stdparll>41.7</stdparll>
            <longcm>-82.5</longcm>
            <latprjo>39.66666666666666</latprjo>
            <feast>1968500.0</feast>
            <fnorth>0.0</fnorth>
          </lambertc>
        </mapproj>
        <planci>
          <plance>coordinate pair</plance>
          <coordrep>
            <absres>0.01</absres>
            <ordres>0.01</ordres>
          </coordrep>
          <plandu>foot_us</plandu>
        </planci>
      </planar>
      <geodetic>
        <horizdn>D North American 1983 HARN</horizdn>
        <ellips>GRS 1980</ellips>
        <semiaxis>6378137.0</semiaxis>
        <denflat>298.257222101</denflat>
      </geodetic>
    </horizsys>
    <vertdef>
      <altsys>
        <altdatum>North American Vertical Datum of 1988(GEOID03)</altdatum>
        <altres>0.01</altres>
        <altunits>feet</altunits>
        <altenc>Explicit elevation coordinate included with horizontal coordinates</altenc>
      </altsys>
    </vertdef>
  </spref>
  <distinfo>
    <distrib>
      <cntinfo>
        <cntorgp>
          <cntorg>OGRIP</cntorg>
        </cntorgp>
        <cntpos>GIS Manager</cntpos>
        <cntaddr>
          <addrtype>mailing and physical address</addrtype>
          <address>77 S. High St. - Rm 1990</address>
          <city>Columbus</city>
          <state>OH</state>
          <postal>43215</postal>
          <country>USA</country>
        </cntaddr>
        <cntvoice>(614) 466-4747</cntvoice>
        <cntfax>(614) 728-5297</cntfax>
        <hours>8:00 a.m. to 5:00 p.m. Eastern Time</hours>
      </cntinfo>
    </distrib>
    <resdesc>Downloadable Data</resdesc>
    <distliab>The information contained in these data is dynamic and may change over time. The data are not better than the original sources from which they were derived. It is the responsibility of the data user to use the data appropriately and within the limitations of the data for which it was requested and prepared, in general, and these data in particular. The related graphics are intended to aid the data user in acquiring relevant data. It is not appropriate to use the related graphics as data. Woolpert gives no warranty, expressed or implied, as to the accuracy, reliability, or completeness of these data. It is strongly recommended that these data are directly acquired from a Woolpert server, and not indirectly through other sources which may have changed the data in some way. Although these data have been processed successfully upon Woolpert’s computer system, no warranty, expressed or implied, is made regarding the utility of the data on another system, or for general or scientific purposes; nor shall the act of distribution constitute any such warranty. This disclaimer applies both to individual use of the data and aggregate use with other data.</distliab>
  </distinfo>
  <metainfo>
    <metd>20180227</metd>
    <metc>
      <cntinfo>
        <cntorgp>
          <cntorg>OGRIP</cntorg>
          <cntper>Jeff Smith</cntper>
        </cntorgp>
        <cntpos>GIS Manager</cntpos>
        <cntaddr>
          <addrtype>mailing and physical address</addrtype>
          <address>77 S. High St. - Rm 1990</address>
          <city>Columbus</city>
          <state>OH</state>
          <postal>43215</postal>
          <country>USA</country>
        </cntaddr>
        <cntvoice>(614) 466-4747</cntvoice>
        <cntfax>(614) 728-5297</cntfax>
        <hours>8:00 a.m. to 5:00 p.m. Eastern Time</hours>
      </cntinfo>
    </metc>
    <metstdn>FGDC Content Standards for Digital Geospatial Metadata</metstdn>
    <metstdv>FGDC-STD-001-1998</metstdv>
    <mettc>local time</mettc>
  </metainfo>
</metadata>