Merrick & Co 20190509 las data LIDAR-derived binary (.las) files containing classified points of all returns. We have seven (7) classifications Unclassified, Ground, Low Noise, Water, Ignore Ground, Bridge Decks and High Noise. The files are delivered in section formatted tiles. These files adhere to the National Enhanced Elevation Assessment (NEEA) Quality Level 2 standards, two points or greater per square meter. These files are delivered in tile format (3000x3000ft). LiDAR terrain mapping to the Colorado Water Conservation Board (CWCB) for all or portions of Weld, Morgan, Adams, Arapahoe, Denver, Douglas, Elbert, El Paso, Lincoln, Pueblo, Otero, Las Animas, and Huerfano Counties. Represents a high-resolution data set of lidar for an Area of Interest (AOI) totaling approximately 18,348.89 square miles. The Colorado South AOI requires Quality Level Two (QL2) deliverable products and is approximately 5505 square miles and 17,602 3000 by 3000ft tiles. Project Name: 3DEP Eastern Colorado Lidar Task Order No.: 2019-1 Master Task Order Contract No.: MA PDAA 2018*005 Task Order Contract No.: CMS#105275 USGS-NGP Base Lidar Specification v1.2 Optech Galaxy Airborne Laser Terrain Mappers (ALTM) SN5060380 and SN5060385 8 0.7 2 0.7 2 2300 170 30 62 250 3.5 1.05 1064 1 0.25 1233 20 National Geodetic Survey (NGS) Geoid12B 0 0 0 0 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 10 Ignore Breakline 17 Bridge 18 High Noise 20180504 20180812 ground condition Complete Unknown -105.510726 -103.378395 38.531868 36.965906 2996931.68502845 3607043.74889507 1679185.57748879 1115712.56825507 None Breaklines Elevation Data Lidar DEM Intensity None Eastern Colorado 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be aware that temporal changes may have occurred since this dataset was collected and that some parts of these data may no longer represent actual surface conditions.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. Lidar data was collected using Optech Galaxy 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, ignored ground, bridge decks and high noise. 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). 20190319 Point State Plane Coordinate System 1983 0503 37.23333333333333 38.43333333333333 -105.500000 36.66666666666666 3000000.000316 999999.999996 coordinate pair 0.001 0.001 survey feet D_NAD_1983_2011 Geodetic Reference System 80 6378137.000000 298.257222 North American Vertical Datum of 1988 Geoid12B 0.001 feet Explicit elevation coordinate included with horizontal coordinates 20190509 Merrick & Co mailing and physical address

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