Quantum Spatial, Inc. 20201210 Raster digital data Product: These are Digital Elevation Model (DEM) data for New Hampshire as part of the required deliverables for the NH Coastal Lidar Work Package 183374, Work Unit 183464 project. Class 2 (ground) LiDAR points in conjunction with the hydro breaklines were used to create a 2.5 foot hydro-flattened Raster DEM. Geographic Extent: 8 counties in New Hampshire, covering approximately 1167 total square miles. Dataset Description: The NH Coastal Lidar Work Package 183374, Work Unit 183464 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. Project specifications are based on the U.S. Geological Survey National Geospatial Program Base LiDAR Specification, Version 1.3. The data were developed based on a horizontal projection/datum of NAD 1983 2011 StatePlane New Hampshire FIPS 2800 Ft US, Foot US and vertical datum of NAVD88 Geoid 12b, Foot US. LiDAR data were delivered as processed Classified LAS 1.4 files formatted to 5600 individual 2500 ft x 2500 ft tiles, as tiled intensity imagery, and as tiled bare earth DEMs; all tiled to the same 2500 ft x 2500 ft schema. Continuous breaklines were produced in Esri file geodatabase format. Ground Conditions: LiDAR was collected in fall 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, Quantum Spatial, Inc. utilized a total of 0 ground control points that were used to calibrate the LiDAR to known ground locations established throughout the project area. An additional 0 independent accuracy checkpoints, 0 in Bare Earth and Urban landcovers (0 NVA points), 0 in Tall Weeds categories (0 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 DEMs. The purpose of these LiDAR data was to produce high accuracy 3D hydro-flattened digital elevation models (DEMs) with a 2.5 foot cell size. These raw LiDAR point cloud data were used to create classified LiDAR LAS files, intensity images, 3D breaklines, and hydro-flattened DEMs as necessary. Raster File Type = GeoTIFF; Bit Depth/Pixel Type = 32-bit float; Raster Cell Size = 2.5 foot; Interpolation or Resampling Technique = Triangulated Irregular Network (TIN), Linear Interpolation, Proprietary; Required Vertical Accuracy = 0.196 20191116 20200423 Ground condition In work As needed -71.9334629195 -70.6737313887 43.5257584545 42.6843389773 913489.591609 1247616.97772 373853.500534 68706.5203005 None Model Raster DEM Remote Sensing Elevation Data Lidar None New Hampshire Belknap County Hillsborough County Merrimack County Middlesex County Rockingham County Strafford County Worcester County York County 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 their limitations. Acknowledgement of the organization providing these data to the public would be appreciated for products derived from these data. Data cover 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 pass Non-Vegetated Vertical Accuracy specifications. This data set was produced to meet ASPRS Positional Accuracy Standard for Digital Geospatial Data (2014) for a 10-cm RMSEz Vertical Accuracy Class. Hydro-Flattened Raster DEM Processing: Class 2 (Ground) LiDAR points in conjunction with the hydro-breaklines were used to create a 2.5 foot hydro-flattened raster DEM. Using automated scripting routines within ArcMap, GeoTIFF files were created for each tile. Each surface was reviewed using Global Mapper to check for any surface anomalies or incorrect elevations found within the surface. 2020 Raster Pixel 1000 1000 State Plane Coordinate System 1983 2800 0.999966666667 -71 42.5 984250 0.0 coordinate pair 2.5 2.5 Foot US D NAD 1983 2011 Geodetic Reference System 80 6378137.0 298.257222101 NAVD88 Geoid 12b 0.001 Foot US Explicit elevation coordinate included with horizontal coordinates 20201210 Quantum Spatial, Inc. mailing and physical

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