EAARL Coastal Topography—Chandeleur Islands, Louisiana, 12-13 February 2011: Seamless (Bare Earth and Submerged)

ASCII XYZ point-cloud data for the Chandeleur Islands in Louisiana were produced from remotely sensed, geographically referenced elevation measurements collected on February 12 and 13, 2011 by the U.S. Geological Survey. Elevation measurements were collected over the area using the first-generation Experimental Advanced Airborne Research Lidar (EAARL-A), a pulsed laser ranging system mounted onboard an aircraft to measure ground elevation, vegetation canopy, and coastal topography. The system uses high-frequency laser beams directed at the Earth's surface through an opening in the bottom of the aircraft's fuselage. The laser system records the time difference between emission of the laser beam and the reception of the reflected laser signal in the aircraft. The plane travels over the target area at approximately 55 meters per second at an elevation of approximately 300 meters, resulting in a laser swath of approximately 240 meters. More than 100 kilometers of coastline can be surveyed easily within a 3- to 4-hour mission. When resultant elevation maps for an area are analyzed, they provide a useful tool to make management decisions regarding land development.

美国地质调查局（U.S. Geological Survey）于2011年2月12日至13日采集遥感地理参考高程测量数据，据此生成了路易斯安那州尚德利尔群岛的ASCII格式XYZ点云数据集。本次数据采集依托初代实验型先进机载研究激光雷达（Experimental Advanced Airborne Research Lidar，EAARL-A）完成，该系统为搭载于航空器的脉冲激光测距系统，可用于测量地面高程、植被冠层与海岸地形。系统通过飞机机身底部的开口将高频激光束投射至地球表面，并记录激光束发射时刻与机载平台接收反射激光信号时刻之间的时间差。飞行平台以约55米/秒的速度在目标区域上空巡航，飞行高度约300米，可形成宽度约240米的激光扫描带，单次3至4小时的飞行任务即可轻松完成超过100公里海岸线的测绘工作。对区域生成的高程地图进行分析后，可作为土地开发相关管理决策的实用辅助工具。