Merrick-Surdex Joint Venture, LLP 20200807 las data LIDAR-derived binary (.las) files containing classified points of all returns. We have seven (7) classifications Unclassified, Ground, Low Noise, Water, Bridge Decks, High Noise and Ignore Ground. These files adhere to USGS-NGP Lidar Base Specification, Version 2.1 Quality Level 2 (QL2) standards, two points or greater per square meter. These files are delivered in tile format (1000x1000m). This project will support the 3DEP mission, the Federal Emergency Management Agency (FEMA) Risk Mapping, Assessment and Planning (MAP) program and the Natural Resources Conservation Service (NRCS) high resolution elevation enterprise program. The entire AOI covers approximately 8,964 square miles in total in Northeast Nebraska delivered in UTM Zone 14 coordinate system. This project is broken into three delivery blocks. The following block square miles are approximations: Block1 = 4492, Block2 = 2964, Block3 = 1508. USGS Task Order NE_Northeast_2020_D20(USGS Task Order Number 140G0220F0072) USGS-NGP Base Lidar Specification v2.1 Optech Galaxy Prime Airborne Laser Terrain Mappers (ALTM) SN5060420 8 0.7 2 0.7 2 2730 140 50 55 500 3.5 1.05 1064 1 0.25 2540 20 National Geodetic Survey (NGS) Geoid18 0.2 0.0 0 1.4 6 Withheld (ignore) points were identified in these files using the standard LAS withheld bit. Swath "overage" points were identified in these files using the standard LAS overlap bit. 12 1 Unclassified 2 Ground 7 Low Noise 9 Water 20 Ignore Breakline 17 Bridge 18 High Noise 20200418 20200426 ground condition Complete Unknown -97.520827 -97.116289 42.891196 41.734899 623000.000000 654000.000000 4750000.000000 4622000.000000 None Breaklines Elevation Data Lidar DSM Intensity None Northeast Nebraska 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be aware that temporal changes may have occurred since this dataset was collected and that some parts of these data may no longer represent actual surface conditions.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 this project. These 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 Non-Vegetated Vertical Accuracy specifications. This data set was produced to meet ASPRS Positional Accuracy Standard for Digital Geospatial Data (2014) for a 10-cm RMSEz Vertical Accuracy Class. Lidar data was collected using Optech Galaxy Prime sensor. The raw data was verified in MARS software for complete coverage of the project area, and boresighted to align the flightlines. Raw data files were parsed into manageable client-specific tiles. These tiles were then processed through automated filtering that separates the data into different classification groups: unclassified points, ground points, low noise, water, bridge decks, high noise and ignore ground. The data was next taken into MARS to reclassify the erroneous points that may remain in the lidar point cloud after auto filter. Two points per square meter (QL2). 20200805 LiDAR swath data was measured to have an average of 0.559 meter nominal pulse spacing and a 3.201 pulses per meter. The method used was counting first return points within the each swath then dividing by the area of the extent of the corresponding swath to get density. NPS was mathematically derived from this density number. This was performed on each swath then averaged to generate the two numbers above. This USGS method does not consider swath sidelap in these calculations. 20200805 Point Universal Transverse Mercator 14 0.9996 -99.000000 0.000000 500000 0 coordinate pair .001 .001 meters D_NAD_1983_2011 Geodetic Reference System 80 6378137.000000 298.257222 North American Vertical Datum of 1988 Geoid2018 0.001 meters Explicit elevation coordinate included with horizontal coordinates 20200808 Merrick-Surdex Joint Venture, LLP mailing and physical address

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