[2020-7-21] Downriver Drone Orthomosaic, Digital Surface Model, and Processing Report

This is the drone orthomosaic, digital surface model (DSM), and PhotoScan-generated report for the July 21, 2020 sampling date for the Evans et al. Sawyer Mill dam removal study. This data is for the downriver study area on the Bellamy River in Dover, NH, USA. A DJI Phantom 3 Professional small unmanned aerial system was used to collect the aerial imagery. The imagery was processed in Agisoft PhotoScan Professional. A Topcon Hiper Lite+ was mostly used to collect the survey data, with a total station used to collect a handful of ground control point locations where satellite signal was poor. <br>The products' XY is in WGS 84, and the vertical datum corresponds to NAVD88 in meters. Please see Alexandra's dissertation (University of New Hampshire, 2021) for additional information on the drone products.<br><br>These materials were made using resources from an NSF EPSCoR funded project “RII Track-2 FEC: Strengthening the scientific basis for decision-making about dams: Multi-scale, coupled-systems research on ecological, social, and economic trade-offs” (a.k.a. "Future of Dams"). Support for this project is provided by the National Science Foundation’s Research Infrastructure Improvement NSF #IIA-1539071. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.

本数据集为埃文斯（Evans）等人开展的索耶米尔（Sawyer Mill）水坝拆除研究的配套数据，对应2020年7月21日的采样日期，包含无人机正射影像图、数字表面模型（DSM）以及PhotoScan生成的研究报告。本数据覆盖美国新罕布什尔州多佛市贝拉米河下游研究区域。本次航空影像采集采用DJI Phantom 3 Professional小型无人航空系统，影像处理工作在Agisoft PhotoScan专业版软件中完成。测量数据主要通过拓普康Hiper Lite+设备采集，在卫星信号不佳的区域，少量地面控制点（ground control point）的位置则采用全站仪进行采集。
本数据集产品的XY坐标系采用WGS 84，垂直基准面为以米为单位的NAVD88。如需了解无人机相关产品的更多细节，请参阅亚历山德拉（Alexandra）于2021年提交的新罕布什尔大学学位论文。
本研究材料依托美国国家科学基金会竞争研究激励实验项目（NSF EPSCoR）资助的课题“RII Track-2 FEC：强化水坝决策科学基础——生态、社会与经济权衡的多尺度耦合系统研究”（又名“水坝的未来”）制作完成。本项目由美国国家科学基金会研究基础设施改进项目（NSF #IIA-1539071）提供资助。本材料中表达的任何观点、研究结果、结论及建议均仅代表作者本人，不必然反映美国国家科学基金会的官方立场。