Digital photographs of bluffs using a remotely piloted unoccupied aerial system in St. Joseph, MI, July 8, 2019 and July 13, 2021

Images were collected using a remotely piloted unoccupied aerial system over the bluffs of the eastern shore of Lake Michigan in St. Joseph rural residential area, Allegan County, MI. The digital imagery was collected with the internal camera of a DJI Phantom 3 PRO for 2019 data and DJI Phantom 4 PRO for 2021 data that was operated by the University of Toledo. on July 13, 2021. They cover an extent between the intersection of Lakeshore Dr. with Lakeshore Road to the north, and South Lakeshore Dr. to the south. Images were collected to monitor active bluff erosion in the area. The images are presented here in zipped files grouped by type of collection, nadir and oblique. The images were collected in .jpg format with red, green, blue (RGB) information and include Exif metadata with GPS date, time, and latitude and longitude, and other fields. These files were used in structure-from-motion (SfM) processing to obtain georeferenced 3D data.

本数据集图像采用遥控无人航空系统（remotely piloted unoccupied aerial system）采集，采集区域位于密歇根州阿勒根县圣约瑟夫乡村居民区的密歇根湖东岸崖岸地带。2019年影像数据采用大疆精灵3专业版（DJI Phantom 3 PRO）内置相机采集，2021年影像数据则由托莱多大学（University of Toledo）操作的大疆精灵4专业版（DJI Phantom 4 PRO）内置相机采集，此次采集时间为2021年7月13日。影像覆盖范围北至湖滨大道（Lakeshore Dr.）与湖滨路的交叉口，南至南湖滨大道（South Lakeshore Dr.）。本数据集影像采集目的为监测该区域活跃的崖岸侵蚀活动。本次公开的影像以压缩包形式存储，按采集类型分为天底视角（nadir）与斜视角（oblique）两类。影像采用JPEG格式存储，包含红、绿、蓝（RGB）三通道色彩信息，且附带Exif元数据，其中包含GPS日期、时间、经纬度及其他相关字段。该数据集文件曾用于运动恢复结构（structure-from-motion, SfM）处理，以获取地理参考三维数据。