Merrick-Surdex Joint Venture, LLP 20240802 Lidar Point Cloud LIDAR-derived binary (.las) files containing classified points of all returns. We have eleven (11) classifications Unclassified (Class 1), Ground (Class 2), Low Vegetation (Class 3), Medium Vegetation (Class 4), High Vegetation (Class 5), Buildings (Class 6), Low Noise(Class 7), Water (Class 9), Bridge Decks(Class 17), High Noise (Class18) and Ignored Ground (Class 20). These files adhere to USGS-NGP Lidar Base Specification 2023 rev. A Quality Level 1 (QL1) standards, eight points or greater per square meter. These files are delivered in tile format (2000x2000ft). This project will support the National Resources Conservation Service (NRCS) high resolution elevation enterprise program, the Illinois State Geological Survey's Height Modernization Program, and the 3DEP mission. The Defined Project Area (DPA) is represented by the USGS-provided Esri shapefile IL_10CountyNRCS_D23_DPA, and encompasses approximately 7,454 square miles, and includes all or portions of Pike, Scott, Bureau, Logan, Christian, Madison, Livingston, Ford, Kankakee, and Iroquois in the state of Illinois. Said DPA is made up of six (6) non-contiguous individual boundaries or Areas of Interest (AOIs). The Block3 area is approximately 2097 square miles and contains 15090 tiles (2000ft by 2000ft). USGS Task Order 140G0223F0169-IL_10CountyNRCS_D23 Synthetic Points: Optech's Galaxy T2000 raw lidar post-processing software LMS uses a method to fill small voids with synthetic points when the PulseTRAK algorithm drops a point recording. This can happen between the transition of PIA (pulse-in-air) zones. Time periods have been converted from UTC to Central Standard Time for the metadata. USGS-NGP Lidar Base Specification 2023, Revision A Optech Galaxy T2000 Airborne Laser Terrain Mappers (ALTM) - SNs: 5060411, 5060475, 5060495 8 0.35 8 0.35 8 1935 170 30 130 1700 3.5 0.89 1064 1 0.23 1037 20 National Geodetic Survey (NGS) Geoid18 0.174 2.2 cm 29 1.4 6 Withheld (ignore) points were identified in these files using the standard LAS withheld bit. Swath "overage" points were not identified in these files using the standard LAS overlap bit. 12 1 Unclassified 2 Ground 3 Low Vegetation 4 Medium Vegetation 5 High Vegetation 6 Buildings 7 Low Noise 9 Water 17 Bridge 18 High Noise 20 Ignored Ground 20231211 20240129 ground condition Complete Unknown -90.2768610554479 -89.0227581615857 40.3261205595866 38.6540663394385 2265233.42755466 2619663.45026405 1333949.68442992 723952.064358987 None Elevation Data Lidar DSM None Illinois 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 and NRCS would be appreciated for products derived from these data. Optech LMS 4.x, MARS 2023.x, Windows 10 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. The lidar data set was produced to meet ASPRS "Positional Accuracy Standards for Digital Geospatial Data" (2014) for a 20 (cm) RMSEx / RMSEy Horizontal Accuracy Class which equates to Positional Horizontal Accuracy = +/- 43 cm at a 95% confidence level. 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 T2000 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. Eight points per square meter (QL1). 20240802 LiDAR swath data was measured to have an aggregate of 0.174 meter nominal pulse spacing and 29.235 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. 20240802 The Maximum Surface Height Rasters (MSHR) are created from all lidar return points minus witheld points to a two-foot (2.0ft) cell size, 32-bit floating point raster images using MARS software. The MSHR are exported to the project tiling scheme (2000x2000ft) Projection information is applied that reflects the project Coordinate Reference System (CRS). 20240802 Swath Separation Imagery was produced for the entire project area. Swath separation images use color-coding to illustrate differences in elevation (z) values where swaths overlap. The color-coded images are semi-transparent and overlay the lidar intensity image. They are ancillary data used as visual aids to more easily identify regions within point cloud datasets that may have suspect interswath alignment or other geometric issues. Imagery was created using last returns with all classification and bit flags, except for noise and withheld bit flag are included. Images are derived from a TIN and have a 50% transparent RGB layer over lidar intensity. These files were produced as GeoTIFF tiles using a cell size of two-foot (2.0ft). 20240802 Point Point 163,628,815,707 NAD 1983 2011 StatePlane Illinois West FIPS 1202 Ft US 0.9999411764705882 -90.16666666666667 36.66666666666666 2296583.333333333 0.0 coordinate pair 0.001 0.001 foot_us D NAD 1983 2011 GRS 1980 6378137.0 298.257222101 North American Vertical Datum of 1988 Geoid2018 0.001 foot_us Explicit elevation coordinate included with horizontal coordinates 20240802 Merrick-Surdex Joint Venture, LLP mailing and physical address

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