KYAPED Hydro-Enforced Breaklines Phase 3 (2023 - Present)

Product: Breakline data is used to hydroflatten the DEMs created for the KYAPED_Lidar_2023 project. Breaklines are reviewed against LiDAR intensity imagery to verify completeness of capture. Geographic Extent: 79 counties in Kentucky, covering approximately 18050 total square miles. Dataset Description: The KYAPED_Lidar_2023 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, 2023 Rev. A. The data were developed based on a horizontal projection/datum of NAD 1983 StatePlane Kentucky FIPS 1600 Feet, Foot US and vertical datum of NAVD88 Geoid 12b, Foot US. LiDAR data were delivered as processed Classified LAS 1.4 files formatted to 20384 individual 5000 ft x 5000 ft tiles, as tiled intensity imagery, and as tiled bare earth DEMs; all tiled to the same 5000 ft x 5000 ft schema. Continuous breaklines were produced in Esri file geodatabase format. Ground Conditions: LiDAR was collected in winter 2022 and 2023, 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, NV5 Geospatial utilized a total of 226 ground control points that were used to calibrate the LiDAR to known ground locations established throughout the project area. An additional 561 independent accuracy checkpoints, 331 in Bare Earth and Urban landcovers (331 NVA points), 230 in Tall Weeds categories (230 VVA points), were used to assess the vertical accuracy of the data. These checkpoints were not used to calibrate or post process the data. https://ky.box.com/v/kymartian-kyaped-breaklines-p3产品：特征断线数据（Breakline data）用于对KYAPED_Lidar_2023项目生成的数字高程模型（DEM, Digital Elevation Model）开展水文平整处理。需对照激光雷达（LiDAR）强度影像对特征断线进行复核，以验证采集完整性。 地理范围：覆盖美国肯塔基州79个县，总面积约18050平方英里。 数据集说明：KYAPED_Lidar_2023项目要求完成激光雷达数据的规划、采集、处理及衍生产品生产，标称脉冲间距（NPS）设定为0.71米。本项目技术规范依据《美国地质调查局国家地理空间项目基础激光雷达技术规范（2023年修订版A）》（U.S. Geological Survey National Geospatial Program Base LiDAR Specification, 2023 Rev. A）制定。 数据采用的水平投影基准为NAD 1983肯塔基州平面投影（FIPS 1600英尺，美国英尺），垂直基准为NAVD88大地水准面12b（美国英尺）。 激光雷达数据以处理后的分类LAS 1.4格式文件交付，共分为20384幅5000英尺×5000英尺的分幅瓦片，同时提供分幅强度影像及分幅裸地数字高程模型，所有数据均遵循统一的5000英尺×5000英尺分幅规范。连续型特征断线数据以Esri文件地理数据库格式产出。 地面采集条件：激光雷达数据采集于2022年冬季至2023年冬季，采集时段内无积雪覆盖，河流水位处于正常或低于正常水平。 为对激光雷达数据进行后处理以满足任务订单技术规范及美国摄影测量与遥感学会（ASPRS, American Society for Photogrammetry and Remote Sensing）垂直精度指南要求，NV5 Geospatial共使用226个地面控制点，用于将激光雷达数据校准至项目区域内预先布设的已知地面坐标点位。 另增设561个独立精度检查点，其中331个位于裸地与城市土地覆盖类型区（331个NVA检查点）、230个位于高杂草覆盖区（230个VVA检查点），用于评估数据的垂直精度，此类检查点未参与数据校准或后处理流程。 数据访问链接：https://ky.box.com/v/kymartian-kyaped-breaklines-p3