Quantum Spatial, Inc. 20191106 raster data Product: QL1 Highest Hit DSM. 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 Umiaq. Quantum Spatial coordinated the data acquisition and performed all calibration, follow up processing, and creation of the final derived products. Raster File Type = IMG and ESRI GRID Bit Depth/Pixel Type = 32-bit float Raster Cell Size =1.5 ft (QL1) Interpolation or Resampling Technique = Highest Hit Required Vertical Accuracy = 19.6 cm NVA 20180714 20190818 ground condition: Acquisition below aircraft free of smoke, fog and cloud cover In Work None planned -151.956898 -150.875360 70.236898 68.123077 1398000.000000 1521000.000000 5937000.000000 5166000.000000 None Model Raster DSM Remote Sensing Elevation Data Lidar None Alaska Anaktuvuk Pass, Nuiqsut, Deadhorse 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 in the contract. Datasets contain complete coverage of tiles. No points have been removed or excluded. A visual qualitative assessment was performed to ensure data completeness. There are no void areas or missing data. The raw point cloud is of good quality and data passes Non-Vegetated Vertical Accuracy specifications. The project specifications require the accuracy (ACCz) of the derived DEM be calculated and reported in two ways: 1. The required NVA is: 19.6 cm at a 95% confidence level, derived according to NSSDA, i.e., based on RMSE of 10 cm in the “bare earth” and "urban" land cover classes. This is a required accuracy. The NVA was tested with 56 checkpoints located in bare earth and urban (non-vegetated) areas. 2. Vegetated Vertical Accuracy (VVA): VVA shall be reported for "shrubland", "tall grass", and "tundra" land cover classes. The target VVA is: 29.4 cm at the 95th percentile, derived according to ASPRS Guidelines, Vertical Accuracy Reporting for Lidar Data, i.e., based on the 95th percentile error in all vegetated land cover classes combined. This is a target accuracy. The VVA was tested with 32 checkpoints located in shrubland, tall grass, and tundra areas. The checkpoints were distributed throughout the project area and were surveyed using GPS techniques. See survey report for additional survey methodologies. AccuracyZ has been tested to meet 19.6 cm or better Non-Vegetated Vertical Accuracy at 95% confidence level using RMSE(z) x 1.9600 as defined by the National Standards for Spatial Data Accuracy (NSSDA); assessed and reported using National Digital Elevation Program (NDEP)/ASRPS Guidelines. 0.042 Tested 0.042 meters NVA at a 95% confidence level using RMSE(z) x 1.9600 as defined by the National Standards for Spatial Data Accuracy (NSSDA). The NVA of the derived raster DEM was calculated using 56 independent checkpoints located in the Bare Earth and Urban land cover categories with a resulting RMSE of 0.022 meters. 0.141 Tested 0.141 meters VVA at the 95th percentile. The VVA of the derived raster DEM was calculated using 32 independent checkpoints located in forest, shrub, and tall grass land cover classes. High Hit DSM creation: High Hit DSMs were created using the highest hit method from all valid returns. 20191101 Raster Pixel 1000 1000 State Plane Coordinate System 1983 5004 0.99990000 -150.0 54.0 1640416.66666667 0.0 coordinate pair 1.5 1.5 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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