[2018-5-8] Middle and Lower Impoundments Drone Orthomosaic, Digital Surface Model, and Processing Report

This is the drone orthomosaic, digital surface model (DSM), and PhotoScan-generated report for the May 8, 2018 sampling date for the Evans et al. Sawyer Mill dam removal study. This data is for the middle and lower impoundment 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 mainly used to collect the survey data. <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.

本数据集包含2018年5月8日采样日的Evans等人索耶米尔大坝拆除研究相关的无人机正射影像（drone orthomosaic）、数字表面模型（digital surface model, DSM）以及由PhotoScan生成的研究报告。该数据覆盖美国新罕布什尔州多佛市贝拉米河中下游库区研究区域。本次航拍影像采集采用DJI Phantom 3 Professional小型无人航空系统，影像后处理工作在Agisoft PhotoScan Professional软件中完成，外业测量数据主要通过Topcon Hiper Lite+设备采集。
本次产出数据的平面坐标系采用世界大地测量系统1984（WGS 84），垂直基准面为以米为单位的北美垂直基准1988（NAVD88）。如需了解该无人机衍生产品的更多细节，请参阅Alexandra的学位论文（新罕布什尔大学，2021年）。
本数据集依托美国国家科学基金会（National Science Foundation, NSF）EPSCoR资助项目“RII Track-2 FEC：强化大坝决策科学基础——生态、社会与经济权衡的多尺度耦合系统研究”（又称“大坝的未来”）的相关资源完成。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、发现、结论及建议仅代表作者本人，不必然反映美国国家科学基金会的官方立场。