Ground control points collected for Helikite operations at the Pea Island National Wildlife Refuge DUNEX Site, North Carolina in September and October 2021

The data in this part of the release provide the location information of the temporary ground control points placed on the beach at the USGS DUring Nearshore Event eXperiment (DUNEX) site on Pea Island National Wildlife Refuge, NC. DUNEX is a multi-agency, academic, and non-governmental organization collaborative community experiment designed to study nearshore coastal processes during storm events. USGS participation in DUNEX will contribute new measurements and models that will increase our understanding of storm impacts to coastal environments, including hazards to humans and infrastructure and changes in landscape and natural habitats. Collected data are part of field activity 2021-029-FA. During September and October 2021, USGS and Woods Hole Oceanographic Institute (WHOI) scientists conducted multiple field surveys to collect an elevation time series. Ground control point location data were collected using a real time kinematic – satellite navigation system (RTK-GNSS) receiver. Images of the beach for use in structure from motion were taken with a camera attached to a helium filled balloon-kite (Helikite). Agisoft Metashape (v. 1.8.1) was used to create orthomosaics and digital surface models (DSMs) with the collected imagery and ground control points.

本次发布的本批次数据，提供了北卡罗来纳州皮岛国家野生动物保护区内美国地质调查局（United States Geological Survey, USGS）近岸事件实验（DUNEX）场地海滩上布设的临时地面控制点的位置信息。DUNEX是一项跨多部门、学术机构与非政府组织的协同合作实验项目，旨在研究风暴事件期间的近岸海岸动力过程。美国地质调查局参与DUNEX项目，将提供全新的观测数据与分析模型，有助于深化我们对风暴给海岸环境造成影响的认知，其中涵盖风暴对人类与基础设施的危害，以及海岸景观与自然栖息地的变迁。本次采集的数据属于野外作业项目编号2021-029-FA的组成部分。2021年9月至10月期间，美国地质调查局与伍兹霍尔海洋研究所（Woods Hole Oceanographic Institute, WHOI）的科研人员开展了多次野外勘测，以获取高程时间序列数据。地面控制点的位置数据通过实时动态卫星导航系统（RTK-GNSS）接收机采集得到。用于运动恢复结构分析的海滩影像，通过搭载于氦气充气风筝（Helikite）的相机拍摄获取。研究团队采用Agisoft Metashape（版本1.8.1），结合采集的影像与地面控制点，生成了正射影像镶嵌图与数字表面模型（Digital Surface Model, DSM）。