Sanborn Map Company, Inc. 20200727 raster digital data Product: First-return intensity raster data. Geographic Extent: Brazos County, TX, covering the approximately 155 square miles. Dataset Description:The College_Station_TX_Lidar project called for the planning, acquisition, processing and derivative products of lidar data to be collected at a nominal pulse spacing (NPS) of 0.35 meters (QL1). 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 a horizontal projection/datum of NAD83 (2011), State Plane, U.S. Survey Feet and vertical datum of NAVD88 (GEOID12B), Feet. Lidar data was delivered as processed Classified LASv1.4 files, formatted to 794 individual 2,500 ft x 2,500 ft tiles clipped to the BPA, and as 794 individual 2,500 ft x 2,500 ft tiled intensity imagery, tiled bare-earth DEMs, and contours. Ground Conditions: Lidar was collected in early 2020, 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, The Sanborn Map Company, Inc. established a total of 7 ground control points that were used to calibrate the lidar to known ground locations established throughout the project area. An additional 25 independent accuracy check points, 20 in Open Terrain/Bare-Earth and Urban landcovers (20 NVA points), 5 in Grass, Brush and Trees categories (5 VVA points), were used to assess the vertical accuracy of the data. These check points 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 foot cell size. These raw lidar point cloud data were used to create classified lidar LAS files, intensity images, 3D breaklines, hydro-flattened DEMs, and contours necessary. 1 foot, 8-bit intensity rasters in GeoTIFF format derived from 16-bit normalized lidar point cloud. 20200225 20200227 ground condition Complete None planned -96.4234904459 -96.1359033831 30.6584128237 30.4440751502 None Intensity Images Elevation Data Lidar None Texas Brazos 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. First-Return Intensity Raster Process: GeoCue software was used to create the Intensity Rasters. All overlap classes were ignored during this process. This helps to ensure a more aesthetically pleasing raster. The GeoCue software was then used to verify full project coverage as well. TIFF files were then provided as the deliverable for this dataset requirement. 20200727 Raster Pixel 2500 2500 NAD 1983 2011 StatePlane Texas Central FIPS 4203 Ft US 31.88333333333333 30.11666666666667 -100.3333333333333 29.66666666666667 2296583.333 9842500.000000002 coordinate pair 0.001 0.001 foot D NAD 1983 2011 GRS 1980 6378137.0 298.257222101 20200727 The Sanborn Map Company, Inc. mailing and physical

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