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Service Description: These lidar data are processed classified LAS 1.4 files, formatted to 6333 individual 1,000-meter x 1,000-meter tiles; used to create intensity images, 3D breaklines and hydro-flattened DEMs as necessary. Geographic Extent: Partial coverage of Prince of Wales-Hyder Census Area in southeastern Alaska, covering approximately 2055.6 total square miles over Prince of Wales Island. Dataset Description: The Prince of Wales, AK 2017 QL1 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. Project specifications are based on the U.S. Geological Survey National Geospatial Program Base LiDAR Specification, Version 1.2. The data were developed based on a horizontal projection/datum of NAD83 (2011), UTM Zone 8, meters and vertical datum of NAVD88 (GEOID12B), meters. LiDAR data were delivered as flightline-extent unclassified LAS swaths, as processed Classified LAS 1.4 files formatted to 6333 individual 1,000-meter x 1,000-meter tiles. Tiled intensity imagery, tiled bare earth digital elevation models (DEMs), tiled first return digital surface models (DSMs), tiled shaded relief rasters, and tiled 1-foot contours were produced using a 2,000-meter x 2,000-meter schema (1705 tiles). Continuous breaklines were produced in Esri file geodatabase format. Building footprints were created in Esri file geodatabase format. Ground Conditions: LiDAR was collected in the spring, summer, and fall of 2017, when the least amount of 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. established a total of 79 ground control points that were used to calibrate the LiDAR to known ground locations established throughout the project area. An additional 127 independent accuracy checkpoints, 74 in Bare Earth and Urban landcovers (74 NVA points), 53 in Forested, Shrubs, and Tall Weeds categories (53 VVA points), were used to assess the vertical accuracy of the data. These checkpoints were not used to calibrate or post process the data.
Name: elevation/prince_of_wales_2017_dtm
Description: These lidar data are processed classified LAS 1.4 files, formatted to 6333 individual 1,000-meter x 1,000-meter tiles; used to create intensity images, 3D breaklines and hydro-flattened DEMs as necessary. Geographic Extent: Partial coverage of Prince of Wales-Hyder Census Area in southeastern Alaska, covering approximately 2055.6 total square miles over Prince of Wales Island. Dataset Description: The Prince of Wales, AK 2017 QL1 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. Project specifications are based on the U.S. Geological Survey National Geospatial Program Base LiDAR Specification, Version 1.2. The data were developed based on a horizontal projection/datum of NAD83 (2011), UTM Zone 8, meters and vertical datum of NAVD88 (GEOID12B), meters. LiDAR data were delivered as flightline-extent unclassified LAS swaths, as processed Classified LAS 1.4 files formatted to 6333 individual 1,000-meter x 1,000-meter tiles. Tiled intensity imagery, tiled bare earth digital elevation models (DEMs), tiled first return digital surface models (DSMs), tiled shaded relief rasters, and tiled 1-foot contours were produced using a 2,000-meter x 2,000-meter schema (1705 tiles). Continuous breaklines were produced in Esri file geodatabase format. Building footprints were created in Esri file geodatabase format. Ground Conditions: LiDAR was collected in the spring, summer, and fall of 2017, when the least amount of 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. established a total of 79 ground control points that were used to calibrate the LiDAR to known ground locations established throughout the project area. An additional 127 independent accuracy checkpoints, 74 in Bare Earth and Urban landcovers (74 NVA points), 53 in Forested, Shrubs, and Tall Weeds categories (53 VVA points), were used to assess the vertical accuracy of the data. These checkpoints were not used to calibrate or post process the data.
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