Independent transect point locations (coordinates only) associated with images collected during unmanned aerial systems (UAS) flights over Coast Guard Beach, Nauset Spit, Nauset Inlet, and Nauset Marsh, Cape Cod National Seashore, Eastham, Massachusetts on 1 March 2016 (Text file)

This dataset contains the locations of independent survey points acquired on the same day that images were obtained from unmanned aerial systems (UAS) flown in the Cape Cod National Seashore. The overall objective of the field work was to evaluate the quality and cost of mapping from UAS images. Low-altitude (approximately 120 meters above ground level) digital images were obtained from cameras in a fixed-wing unmanned aerial vehicle (UAV) flown from the lawn adjacent to the Coast Guard Beach parking lot on 1 March, 2016. U.S. Geological Survey technicians deployed and mapped 28 targets that appear in some of the images for use as ground control points. All activities were conducted according to Federal Aviation Administration regulations and under a National Park Service Scientific Research and Collecting Permit, study number CACO-00285, permit number CACO-2016-SCI-003. This dataset contains locations of both in place and placed targets that may be used as ground control to constrain photogrammetric reconstructions. One hundred and forty-four (144) points were measured along several cross-shore transects on the beach. These points were measured with real-time differential global positioning system (GPS) and have horizontal and vertical uncertainties of approximately +/ 0.03 m. These points were not used in photogrammetric processing, so they can be used for independent evaluation of photogrammetric products. The independent survey points are listed in file CACO_transect_Points_20160301.csv.本数据集收录了科德角国家海岸（Cape Cod National Seashore）内无人机航空系统（unmanned aerial systems, UAS）采集影像当日所获取的独立测量点位坐标。本次野外作业的核心目标为评估无人机航空系统影像制图的质量与成本。2016年3月1日，研究团队从紧邻海岸警卫队海滩停车场的草坪起飞固定翼无人机（fixed-wing unmanned aerial vehicle, UAV），搭载相机获取了海拔约120米的低空数码影像。美国地质调查局（U.S. Geological Survey）技术人员布设并测绘了28个在部分影像中可见的靶点，用作地面控制点（ground control points）。所有作业均符合美国联邦航空管理局（Federal Aviation Administration）相关规定，并持有美国国家公园管理局（National Park Service）颁发的科学研究与采集许可，研究编号为CACO-00285，许可编号为CACO-2016-SCI-003。本数据集同时收录了原位靶点与布设靶点的坐标，均可作为地面控制点用于约束摄影测量重建工作。 研究团队在海滩上沿多条跨岸断面测量了144个点位。该批点位采用实时差分全球定位系统（real-time differential global positioning system, GPS）进行采集，水平与垂直精度误差约为±0.03米。由于该批点位未参与摄影测量处理流程，因此可用于独立评估摄影测量产出成果。独立测量点位信息已整理至文件CACO_transect_Points_20160301.csv中。