Tables of file names, times, and locations of 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 files)

These text files contain tables of the file names, times, and locations of images obtained from an unmanned aerial systems (UAS) flown in the Cape Cod National Seashore. The objective of the fieldwork 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. The UAV was a Skywalker X8 flying wing operated by Raptor Maps, Inc., contractors to the U.S. Geological Survey. 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. Two consecutive UAS missions were flown, each with two cameras, autopilot computer, radios, and a global navigation satellite system (GNSS) positioning system as payload. The first flight (f1) was launched at approximately 1112 EST, and followed north-south flight lines, landing at about 1226 EST. Two Canon Powershot SX280 12-mexapixel digital cameras, designated rgb1 and rgb2 made images during this flight. The second flight (f2) was launched at 1320 EST and followed east-west flight lines, landing at 1450 Eastern Standard Time (EST). Prior to f2, rgb2 was replaced with a Canon SX280 modified with a Schott BG 3 filter to emphasize light at near-infrared wavelengths, designated nir1. Rgb1 and nir1 made images during this second flight. The four files are tables of images obtained from the two cameras during the two flights. These tables, which are text files of comma-separated values, contain the image file name, date and time (Universal Time; UT), longitude and latitude (WGS84 decimal degrees), easting and northing (NAD83(2011) UTM Zone 19 North meters, obtained by conversion of the latitude and longitude), and elevation (approximate meters above mean sea level) determined from the UAS GNSS system. Note that this location information was only used to determine proximity of images, and was replaced with calculated camera locations in photogrammetric processing.

本批文本文件包含从科德角国家海岸（Cape Cod National Seashore）空域作业的无人航空系统（Unmanned Aerial Systems, UAS）所获影像的文件名、拍摄时刻与位置信息表格。本次野外作业的目标为评估无人航空系统影像制图的质量与成本。2016年3月1日，作业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飞行器（Unmanned Aerial Vehicle, UAV），搭载相机获取了离地高度约120米的低空数码影像。该无人飞行器为Skywalker X8飞翼机型，由受雇于美国地质调查局（U.S. Geological Survey）的Raptor Maps, Inc.公司负责操作。美国地质调查局的技术人员布设并测绘了28个标识点，部分影像中可捕获这些点位，将其用作地面控制点。所有作业均符合美国联邦航空管理局（Federal Aviation Administration, FAA）相关规定，并持有美国国家公园管理局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。本次任务连续执行了两次无人航空系统作业，单次作业的搭载载荷均包含两台相机、自动驾驶计算机、无线电设备以及全球导航卫星系统（Global Navigation Satellite System, GNSS）定位装置。第一次飞行任务（f1）于东部标准时间约1112时起飞，沿南北向飞行航线作业，于约1226时降落。本次任务中，两台佳能PowerShot SX280 1200万像素数码相机（分别命名为rgb1与rgb2）完成了影像采集。第二次飞行任务（f2）于东部标准时间1320时起飞，沿东西向飞行航线作业，于1450时降落。在f2任务执行前，rgb2被替换为一台加装肖特BG3滤镜的佳能SX280相机，该滤镜可强化近红外波段光线，新相机被命名为nir1。本次第二次飞行任务中，由rgb1与nir1完成影像采集。本次提供的四个文件为两次飞行任务中两台相机所获影像的信息表格，均为逗号分隔值格式的文本文件。表格内容包含影像文件名、日期与时刻（通用时间，Universal Time, UT）、经纬度（世界大地测量系统1984，World Geodetic System 1984, WGS84 十进制度）、东向与北向坐标（北美大地基准1983(2011)，North American Datum 1983(2011), NAD83(2011) 通用横轴墨卡托投影19北带，单位：米，由经纬度转换得到）以及由无人航空系统全球导航卫星系统测定的海拔高度（近似平均海平面以上米数）。请注意，上述位置信息仅用于判断影像间的邻近关系，在摄影测量处理流程中，将被计算得到的相机位置所替代。