Drone based photogrammetry data at the Geysir geothermal field, Iceland

The field campaign and subsequent findings are derived from UAV data collected between July 27th and August 5th, 2016. We used lightweight cameras mounted on a modified DJI Matrice 100 quadcopter drone, allowing flight durations of over 30 min and simultaneous use of optical and thermal cameras. Flight control was based on GPS, with live video feed to the operator and predefined flight paths. Overflights were conducted at different times to optimize image quality: daylight flights at 5:00 local time for optimal contrast for the optical camera, and cold night flights at 3:00 local time for the infrared camera. Altitudes were 120 meters above ground to ensure comprehensive image coverage. The optical camera, a DJI Zenmuse X5R, captured 16-megapixel images at 2 frames per second, with each image geotagged by GPS. The thermal camera, a FLIR Tau 2, had a fully radiometric resolution of 640 × 512 pixels and a spectral band of 7.5-13.5 μm, with GPS geotagging for each image.

本野外作业及后续研究结论均源自2016年7月27日至8月5日期间采集的无人机（UAV）数据。本次实验采用搭载于改装版DJI Matrice 100四旋翼无人机的轻量化相机，该平台可实现单次续航超30分钟，并可同时启用光学与热红外相机。飞行控制系统基于全球定位系统（GPS）搭建，可向操作人员传输实时视频画面并支持预定义飞行航线。为优化成像质量，我们选择不同时段开展飞越作业：于当地时间5:00开展日间飞行，以获取光学相机所需的最佳对比度；于当地时间3:00开展夜间低温飞行，适配红外相机的成像需求。飞行高度设定为距地面120米，以确保实现全面的图像覆盖范围。光学相机采用DJI Zenmuse X5R型号，可捕获1600万像素、帧率为2帧/秒的图像，每张图像均通过GPS进行地理标记。热红外相机采用FLIR Tau 2型号，具备640×512像素的全辐射分辨率，光谱波段覆盖7.5~13.5μm，每张图像均通过GPS完成地理标记。