Quantum Spatial, Inc. 20200116 vector data Product: Breakline data is used to hydroflatten the DEMs created for the Northwestern New Mexico LiDAR project. Breaklines are reviewed against LiDAR intensity imagery to verify completeness of capture. Geographic Extent: 7 counties in New Mexico, covering approximately 8782 total square miles. Dataset Description: The Northwestern New Mexico LiDAR project called for the planning, acquisition, processing, and derivative products of lidar data to be collected at a nominal pulse spacing (NPS) of 0.71 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 UTM Zone 12N, Meter and vertical datum of NAVD88 GEOID 12B, Meter. LiDAR data were delivered as processed Classified LAS 1.4 files formatted to 15177 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. Continuous breaklines were produced in Esri file geodatabase format. Ground Conditions: LiDAR was collected in fall 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, Quantum Spatial, Inc. utilized a total of 200 ground control points that were used to calibrate the LiDAR to known ground locations established throughout the project area. An additional 305 independent accuracy checkpoints, 173 in Bare Earth and Urban landcovers (173 NVA points), 132 in Tall Weeds categories (132 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 1 meter 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. Breakline File Type = GDB; Breakline Elevation Units = Meter; Downhill Treatment Applied = Monotonic, Proprietary; Type of Hydro Treatment Required = Hydro-Flattened 20181114 20181128 Ground condition Complete None planned -109.681526442 -107.921250502 37.0242851958 34.5832890803 620880.78492 774000.0 4098429.72702 3830889.30868 None Model Breaklines LAS Point Cloud Intensity Image Raster DEM Building Footprints Remote Sensing Elevation Data Lidar Hydrology None New Mexico Apache County Cibola County La Plata County McKinley County Montezuma County San Juan 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. These raw LAS and LAS data files include all data points collected. No points have been removed or excluded. The raw point cloud is of good quality and data passes Non-Vegetated Vertical Accuracy specifications. Datasets contain complete coverage of tiles. A visual qualitative assessment was performed to ensure data completeness. There are no void areas or missing data. All files are inspected to ensure that they conform to the specified file naming conventions, all files load in their correct geographic position, all files conform to the project specifications for file standard and content. Hydro-Flattened Breakline Processing: Class 2 (ground) LiDAR points were used to create a bare earth surface model. The surface model was then used to heads-up digitize 2D breaklines of inland streams and rivers with a 100-foot nominal width and inland ponds and lakes of 2 acres or greater surface area. Elevation values were assigned to all Inland Ponds and Lakes, Inland Pond and Lake Islands, Inland Stream and River Islands, using TerraModeler functionality. Elevation values were assigned to all inland streams and rivers using Quantum Spatial, Inc. proprietary software. All Ground (ASPRS Class 2) LiDAR data inside of the collected inland breaklines were then classified to Water (ASPRS Class 9) using TerraScan macro functionality. A buffer of 1 meter was also used around each hydro-flattened feature. These points were moved from ground (ASPRS Class 2) to Ignored Ground (ASPRS Class 20). The breakline files were then translated to Esri file geodatabase format using Esri conversion tools. Breaklines were reviewed against LiDAR intensity imagery to verify completeness of capture. All breaklines were then compared to TINs (triangular irregular networks) created from ground only points prior to water classification. The horizontal placement of breaklines was compared to terrain features and the breakline elevations were compared to LiDAR elevations to ensure all breaklines matched the LiDAR within acceptable tolerances. Some deviation was expected between breakline and LiDAR elevations due to monotonicity, connectivity, and flattening rules that were enforced on the breaklines. Once completeness, horizontal placement, and vertical variance were reviewed, all breaklines were reviewed for topological consistency and data integrity using a combination of Esri Data Reviewer tools and proprietary tools. 2020 Vector Universal Transverse Mercator 12 0.9996 -111 0.0 500000 0.0 coordinate pair 0.001 0.001 Meter D NAD 1983 2011 Geodetic Reference System 80 6378137.0 298.257222101 NAVD88 GEOID 12B 0.001 Meter Explicit elevation coordinate included with horizontal coordinates 20200116 Quantum Spatial, Inc. mailing and physical

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