Dewberry 20220317 raster digital data Product: These are Digital Elevation Model (DEM) data as part of the required deliverables for the NY_FEMAR2_Central_2018_D19 WUID 229498 Lidar Project. Class 2 (ground) lidar points in conjunction with the hydro breaklines were used to create a 1 meter hydro-flattened Raster DEM. Geographic Extent: Broome, Chemung, Chenango, Cortland, Delaware, Ontario, Otsego, Schuyler, Steuben, Sullivan, Tioga, and Yates Counties, New York, covering approximately 6,198 square miles. Dataset Description: NY_FEMAR2_Central_2018_D19 WUID 229498 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 1.3. 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 7,332 individual 1500 m x 1500 m tiles for WUID 229488, as tiled bare earth DEMs; all tiled to the same 1500 m x 1500 m schema. The tile grid contains 7,332 tiles. All tiled to the same 1500 m x 1500 m schema. Ground Conditions: Lidar was collected in early 2019 through mid 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, Dewberry established a total of 117 ground control points for the two subcontractors with 81 in this WUID that were used to calibrate the lidar to known ground locations established throughout the NY_FEMAR2_Central_2018_D19 project area. An additional 186 independent accuracy checkpoints, 114 in Bare Earth and Urban landcovers (114 NVA points), 72 in Tall Grass and Brushland/Low Trees categories (72 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 = 32-bit float Raster Cell Size = 1 Meter Interpolation or Resampling Technique = Triangulated Irregular Network Required Vertical Accuracy = 19.6 cm NVA 20190413 20200925 ground condition Complete None planned -77.492333 -74.344017 43.072780 41.386689 297000 553406.644289 4768896.965385 4584529.161374 None Model Raster DEM Remote Sensing Elevation Data Lidar None New York Broome County Chemung County Chenango County Cortland County Delaware County Ontario County Otsego County Schuyler County Steuben County Sullivan County Tioga County Yates 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 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 produced to meet ASPRS Positional Accuracy Standard for Digital Geospatial Data (2014) for a 10-cm RMSEz Vertical Accuracy Class. Hydro Flattened Raster DEM Process: Class 2 (ground) lidar points in conjunction with the hydro breaklines were used to create a 1 meter hydro-flattened Raster DEM. Using 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. 20220304 Raster Pixel 1500 1500 Universal Transverse Mercator 18 0.9996 -75.000000 0.0 500000 0.0 row and column 1 1 meters North American Datum of 1983 (2011) Geodetic Reference System 80 6378137 298.257222101 North American Vertical Datum of 1988, Geoid 12B 0.01 meters Explicit elevation coordinate included with horizontal coordinates 20230309 20230309 Dewberry mailing and physical

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Tampa FL 33602 USA (813)225-1325 FGDC Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998 None. None. None. Unclassified. None. None. None.