NOAA Coastal Lidar Data

Lidar (light detection and ranging) is a technology that can measure the 3-dimentional location of objects, including the solid earth surface. The data consists of a point cloud of the positions of solid objects that reflected a laser pulse, typically from an airborne platform. In addition to the position, each point may also be attributed by the type of object it reflected from, the intensity of the reflection, and other system dependent metadata. The NOAA Coastal Lidar Data is a collection of lidar projects from many different sources and agencies, geographically focused on the coastal areas of the United States of America. The data is provided in Entwine Point Tiles (<a href="https://entwine.io">https://entwine.io</a>) format, which is a lossless streamable octree of the point cloud. Datasets are maintained in their original projects and care should be taken when merging projects. The coordinate reference system for the data is The NAD83(2011) UTM zone appropriate for the center of each data set and the orthometric datum appropriate for that area (for example, NAVD88 in the mainland United States, PRVD02 in Puerto Rico, or GUVD03 in Guam). The geoid model used is reflected in the data set resource name.

激光雷达（光探测与测距）是一种能够测量物体三维位置的技术，包括固体地球表面。该数据集由反射激光脉冲的固体物体位置点云组成，通常来自空中平台。除了位置信息之外，每个点可能还会被赋予反射物体的类型、反射强度以及其他与系统相关的元数据。NOAA海岸线激光雷达数据集汇集了来自众多不同来源和机构的激光雷达项目，地理上聚焦于美国海岸地区。数据以Entwine点瓦片格式提供，这是一种点云的无损流式八叉树。数据集在原始项目中得到维护，合并项目时需谨慎处理。数据的坐标参考系统为适用于每个数据集中心的NAD83(2011) UTM带以及适用于该区域的正形基准面（例如，美国大陆上的NAVD88，波多黎各的PRVD02，或关岛的GUVD03）。数据集中所使用的地球椭球模型反映在数据集资源名称中。