Sanborn Map Company, Inc. 20200925 raster digital data Product: These are Digital Elevation Model (DEM) data as part of the required deliverables for the lidar project. Class 2 (Ground) lidar points in conjunction with the hydro breaklines were used to create a 2 foot hydro-flattened Raster DEM. Geographic Extent: The Houghton_Keweenaw_Ontonagon AOI, Michigan, covering approximately 1886 square miles. Dataset Description: The 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 meters. Project specifications are based on the U.S. Geological Survey National Geospatial Program Base Lidar Specification, Version 2.1. The data was developed based on a horizontal projection/datum of NAD83 (2011), State Plane, International Feet and vertical datum of NAVD88 (GEOID12B), International Feet. Lidar data was delivered as processed Classified LAS 1.4 files, formatted to 8415 individual 2500 ft x 2500 ft tiles, as tiled intensity rasters, and as tiled bare-earth DEMs; all tiled to the same 2500 ft x 2500 ft schema. Ground Conditions: Lidar was collected in spring 2019 and spring 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, Sanborn Map Company, Inc., utilized a total of 17 ground control points that were used to calibrate the lidar to known ground locations established throughout the project area. 2 of these were provided by the State of Michigan for Isle Royale in Keweenaw County. An additional 51 independent accuracy checkpoints, 30 in Bare Earth and Urban landcovers (30 NVA points), 21 in Tall Grass and Brushland/Low Trees categories (21 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. These lidar point cloud data were used to create intensity images, 3D breaklines, and hydro-flattened DEMs as necessary. Raster File Type = TIFF Bit Depth/Pixel Type = 32-bit float Raster Cell Size = 2 Foot Interpolation or Resampling Technique = Triangulated Irregular Network Required Vertical Accuracy = 19.6 cm NVA 20190526 20200521 ground condition Complete None planned -89.945679 -87.582710 48.248024 46.671100 247700.00 456120.00 5346480.00 5172870.00 None Model Raster DEM Remote Sensing Elevation Data Lidar None Michigan Houghton_Keweenaw_Ontonagon 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. Datasets contain complete coverage of tiles. No points have been removed or excluded. A visual qualitative assessment was performed to ensure data completeness. There are no void areas or missing data. The raw point cloud is of good quality and data passes Non-Vegetated Vertical Accuracy specifications. This data set was tested to meet ASPRS Positional Accuracy Standard for Digital Geospatial Data (2014) for a 10cm RMSEz Vertical Accuracy Class. Actual NVA accuracy was found to be RMSEz = 0.168ft, equating to +/- 0.329ft at 95% confidence level. Actual VVA accuracy was found to be +/- 0.569ft at the 95th percentile. Hydro-Flattened Bare-Earth DEM Process: Class 2 (Ground) lidar points in conjunction with the hydro breaklines were used to create a 2 foot hydro-flattened Raster DEM. Using automated scripting routines within LP360, a GeoTIFF file was created for each tile. Each surface is reviewed using Global Mapper to check for any surface anomalies or incorrect elevations found within the surface. 20200924 Raster Pixel 1250 1250 NAD 1983 (2011) StatePlane Michigan North Intl Feet 47.08333333333334 45.48333333333333 -87 44.78333333333333 26246719.16 0 coordinate pair 0.001 0.001 foot_intl NAD83 National Spatial Reference System 2011 GRS 1980 6378137.0 298.257222101 North American Vertical Datum of 1988, Geoid 12B 0.001 foot_intl Explicit elevation coordinate included with horizontal coordinates 20200925 20200925 Sanborn Map Company, Inc. mailing and physical

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