Building Footprints 2024 (Tacoma)

Building footprints covering the City of Tacoma 2024 Lidar project area. This data is static and some parts of this data may no longer represent actual surface conditions. For reference use only. City of Tacoma 2024 Lidar The purpose of the lidar data was to produce a high accuracy 3D dataset that meets all necessary standards laid out by the 3D Elevation Program and the City of Tacoma Lidar contract. The lidar point cloud data were used to create classified lidar LAS files, intensity images, hydro-flattened DEMs, highest hit surface models, 3D building footprints, Canopy Cover Models, Solar Exposure models, Ray Traced RGBIR Images, and 3D breaklines of rivers and lakes within the study area. Product: 3D building footprints covering the City of Tacoma Lidar project area. Geographic Extent: This dataset and derived products encompass an area covering approximately 43,613 acres of Western Washington. Dataset Description: Lidar flight line swaths were processed to create 445 classified LAS 1.4 files delineated in 2250ft x 2250ft tiles. Each LAS file contains lidar point information, which has been calibrated, controlled, and classified. All permanent building structures exceeding 200 square feet were initially classified in the point cloud and then extracted using proprietary methods. Additional products include classified LAS files, intensity images, Hydroflattened DEMs, and highest hit surface models, 3D building footprints, Canopy Cover Models, Solar Exposure models, Ray Traced RGBIR Images. Ground Conditions: Ground condition was free of snow and acquisition occurred free of smoke, fog and cloud cover. Contractor: NV5 Ground Control Points were acquired and calibrated by NV5. Data acquisition was coordinated by NV5 and all lidar data calibration, and follow-on processing were completed by NV5. Elevation Units: U.S. Feet本数据集为覆盖塔科马市2024年激光雷达（Lidar）项目区域的建筑轮廓数据。本数据为静态数据，部分内容可能已无法反映当前实际地表状况，仅可用于参考用途。 塔科马市2024年激光雷达项目：本次激光雷达数据的制作目标为生成符合三维高程项目（3D Elevation Program）及塔科马市激光雷达合同所规定全部必要标准的高精度三维数据集。本次激光雷达点云数据被用于生成研究区域内的分类激光雷达LAS文件、强度影像、水文平整数字高程模型（DEM）、最高回波地表模型、三维建筑轮廓、冠层覆盖模型、太阳辐射模型、光线追踪RGBIR影像以及河湖三维断裂线。 产品：覆盖塔科马市激光雷达项目区域的三维建筑轮廓数据。 地理覆盖范围：本数据集及其衍生产品覆盖华盛顿州西部约43613英亩的区域。 数据集说明：本次处理激光雷达飞行带数据，生成了445份以2250英尺×2250英尺为分幅单元的分类LAS 1.4文件。每份LAS文件均包含经过校准、控制点校正与分类的激光雷达点云信息。所有面积超过200平方英尺的永久性建筑结构，首先在点云中完成分类，随后通过专有算法提取得到。 额外衍生产品包括分类LAS文件、强度影像、水文平整数字高程模型、最高回波地表模型、三维建筑轮廓、冠层覆盖模型、太阳辐射模型以及光线追踪RGBIR影像。 地表条件：数据采集时段地表无积雪，且无烟雾、雾霭与云层遮挡。 承建方：NV5公司。地面控制点（Ground Control Points）由NV5公司采集并校准；数据采集工作由NV5统筹，所有激光雷达数据校准及后续处理流程均由NV5完成。 高程单位：美制英尺