Dewberry 20190110 raster digital data Product: Texas West Central Block 04 2018 Lidar Intensity Imagery. Geographic Extent: Texas West Central Block 04, covering approximately 3705 square miles. Dataset Description: Texas West Central Block 04 2018 Lidar project called for the Planning, Acquisition, processing and derivative products of lidar data to be collected at a nominal pulse spacing (NPS) of 0.7 meter. Project specifications are based on the U.S. Geological Survey National Geospatial Program Base Lidar Specification, Version 1.2. The data was developed based on a horizontal projection/datum of NAD83 (2011), Universal Transverse Mercator, meters and vertical datum of NAVD88 (GEOID12B), meters. Lidar data was delivered as processed Classified LAS 1.4 files, formatted to 4398 individual 1500 m x 1500 m tiles, as tiled Intensity Imagery, and as tiled bare earth DEMs; all tiled to the same 1500 m x 1500 m schema. Ground Conditions: Lidar was collected in February and March 2018, while no snow was on the ground 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, Dewberry established a total of 33 ground control points that were used to calibrate the lidar to known ground locations established throughout the Texas West Central Block 04 project area. An additional 95 independent accuracy checkpoints, 57 in Bare Earth and Urban landcovers (57 NVA points), 38 in Tall Grass and Brushland/Low Trees categories (38 VVA points), were used to assess the vertical accuracy of the data. These checkpoints were not used to calibrate or post process the data. To acquire detailed surface elevation data for use in conservation planning, design, research, floodplain mapping, dam safety assessments and elevation modeling, etc. Classified LAS files are used to show the manually reviewed bare earth surface. This allows the user to create Intensity Images, Breaklines and Raster DEM. The purpose of these lidar data was to produce high accuracy 3D hydro-flattened Digital Elevation Model (DEM) with a 1 meter cell size. These raw lidar point cloud data were used to create classified lidar LAS files, intensity images, 3D breaklines, hydro-flattened DEMs as necessary. Raster File Type = TIFF Bit Depth/Pixel Type = 8 bit Raster Cell Size = 1 Meter Intensity Values Normalized To = 16 bit 20180210 20180308 ground condition Complete None planned -102.898414 -101.924179 32.519237 31.053743 700500 789000 3600000 3439533 None Intensity Images Elevation Data Lidar None Texas New Mexico Oklahoma Southeastern New Mexico West Texas 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. A visual qualitative assessment was performed to ensure data completeness. No void areas or missing data exist. Intensity Image Generation Process: GeoCue software was used to create the deliverable Intensity Images. All overlap classes were ignored during this process. This helps to ensure a more aesthetically pleasing image. The GeoCue software was then used to verify full project coverage as well. TIF/TWF files were then provided as the deliverable for this dataset requirement. 20180615 Raster Pixel 1500 1500 Universal Transverse Mercator 13 0.9996 -105.000000 0.0 500000 0.0 row and column 1 1 meters North American Datum of 1983 (2011) Geodetic Reference System 80 6378137 298.257222101 20181115 Dewberry mailing and physical

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