EAARL Coastal Topography—Fire Island, New York, 2002

ASCII XYZ data for Fire Island, New York, was produced from remotely sensed, geographically referenced elevation measurements collected October 25 and November 8, 2002 by the U.S. Geological Survey, in cooperation with the National Park Service (NPS) and the National Aeronautics and Space Administration (NASA). 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.

本数据集为纽约火岛的ASCII XYZ坐标数据集，由美国地质调查局（U.S. Geological Survey）联合国家公园管理局（National Park Service, NPS）与美国国家航空航天局（National Aeronautics and Space Administration, NASA），基于2002年10月25日及11月8日采集的遥感地理参考高程测量数据生成。该区域的高程测量采用首代实验型先进机载研究激光雷达（Experimental Advanced Airborne Research Lidar, EAARL-A）完成，这是一款搭载于航空器的脉冲激光测距系统，可同步获取地面高程、植被冠层及海岸地形数据。该系统通过航空器机身底部的开孔，将高频激光束投射至地表。该激光系统会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。航空器以约300米的飞行高度、约55米/秒的速度飞越目标区域，由此形成宽度约240米的激光扫描条带。单次3至4小时的飞行任务即可轻松完成超过100公里海岸线的测绘作业。对区域生成的高程地图进行分析后，可将其作为土地开发相关管理决策的重要辅助工具。