Quantum Spatial, Inc. 20191106 vector data Product: Building footprints attributed with minimum elevation, maximum elevation, average height above ground, and area. Geographic Extent: This dataset and derived products encompass an area covering approximately 463 square miles on the North Slope of Alaska. Dataset Description: The North Slope Borough 3DEP LiDAR project called for the planning, acquisition, and processing of LiDAR data collected at an aggregate nominal pulse spacing (ANPS) of either 0.35 meters or 0.71 meters depending on area. Project specifications are based on the U.S. Geological Survey National Geospatial Program Base LiDAR Specification, Version 1.3. The data was developed based on the NAD83(2011) horizontal datum and NAVD88 (GEOID12B) vertical datum. Data was projected in the appropriate Alaska State Plane Zone for its location. The delivery areas are located in AKSP Zones 2,4,6,7, and 8. All units are in US Survey Feet. The 2018 delivery areas encompasses the Nuiqsut, Kaktovik, Wainwright, Atqasuk, Barrow, Barrow Village, Barrow South, and Deadhorse areas of interest. The 2019 delivery encompass the Anaktuvuk Pass, Point Lay, and Point Hope areas of interest. LiDAR data was delivered as processed Classified LAS 1.4 files, formatted to 6,494 individual 1500 ft x 1500 ft tiles. Derived products include: tiled Intensity Imagery, tiled DZ orthos, tiled and mosaicked bare earth DEMs and shaded relief rasters, tiled and mosaicked Highest Hit Digital Surface Models and shaded relief rasters, tiled 2 ft contour shapefiles, 3D building footprints, and 3D waters edge breaklines. Ground Conditions: LiDAR was collected in summer 2018 and 2019, while the presence of snow on the ground was at a minimum 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, Umiaq established a total of 42 ground control points distributed throughout the North Slope Borough 3DEP, Alaska project area. LiDAR data was calibrated to these known ground locations. An additional 88 independent accuracy checkpoints, 56 in Bare Earth and Urban landcovers (NVA points) and 32 in Tall Grass, Tundra and Shrubbery categories (VVA points), were used to assess the vertical accuracy of the project data. These checkpoints were not used to calibrate or post process the data. The purpose of the lidar data was to produce a high accuracy 3D dataset that meets all necessary standards laid out by the 3DEP initiative. The raw lidar point cloud data were used to create classified lidar las files, hydroflattened DEMs, highest hit DSMs, intensity images, dz orthos, 2 foot contours, 3D hydro breaklines, and 3D building footprints. CONTRACTOR: Quantum Spatial, Inc. Ground Control Points were acquired by Umiaq. Quantum Spatial coordinated the data acquisition and performed all calibration, follow up processing, and creation of the final derived products. File Type = SHP Elevation Units = US Survey Feet Minimum Mapping Unit = 50 sqft 20180714 20190818 ground condition: Acquisition below aircraft free of smoke, fog and cloud cover In Work None planned -163.149038 -159.746567 70.699779 69.688356 1501294.876526 1913353.597442 6105468.295249 5740096.405607 None Shapefile Building Footprints Elevation Data LiDAR None Alaska Point Lay, Wainwright North Slope No restrictions apply to these data. 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. Data covers the entire area specified for the North Slope 3DEP Project Area. All files are inspected to ensure that they conform to the specified file naming conventions, all files load in their correct geographic position, all files conform to the project specifications for file standard and content. Building were automatically classified in the point cloud using terrascan v.18. The classified building points were then used to derive building footprints in shapefile format. Each building polygon was attributed with a minimum ground elevation, maximum elevation, and average height above ground. 20191101 Vector State Plane Coordinate System 1983 5007 0.99990000 -162.0 54.0 1640416.66666667 0.0 coordinate pair 0.01 0.01 US Survey Feet North American Datum of 1983 (2011) Geodetic Reference System 80 6378137.0 298.257222101 North American Vertical Datum of 1988, Geoid 12B 0.01 US Survey Feet Explicit elevation coordinate included with horizontal coordinates 20191106 20191106 Quantum Spatial, Inc. mailing and physical

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