High precision photogrammetry data of Lascar Volcano acquired by UAS survey in 2017 and 2020

Here we present a high precision photogrammetry dataset of Lascar summit crater, which acquired by unmanned aircraft system (UAS) in Nov 2017 and Feb 2020 respectively, and reconstructed by Structure-from-Motion (SfM) method. In which, optical orthomosaic and DEM (Digital Elevation Model) were processed in Agisoft Metashape (version 1.7.3), preprocessing of thermal data was conducted in Thermoviewer (v3.0.7) and thermal mosaic was generated by Pix4Dmapper (v4.5.6). All data was projected to global coordinates (WGS 1984 UTM Zone 19 South). Thermal orthomosaic was georeferenced to 2020 orthomosaic in ArcMap (version 10.8). Employed UAS and SfM-derived product are given as follows: (1) 2017 orthomosaic (7.7 cm/pix) and DEM (15.6 cm/pix): DJI Mavic Pro Platinum (2) 2020 orthomosaic (7.0 cm/pix) and DEM (13.7 cm/pix): DJI Phantom 4 RTK (3) 2020 additional orthomosaic (5.3 cm/pix): DJI Mavic 2 (4) 2020 thermal orthomosaic (spatial resolution: 45.0 cm/pix, radiometric resolution: 0.04 degree/pix): FLIR Tau 2 640 attached to DJI Phantom 4 RTK我们在此发布一套针对拉斯卡尔峰顶火山口的高精度摄影测量数据集。该数据集分别于2017年11月与2020年2月由无人飞行器系统（Unmanned Aircraft System, UAS）采集，并通过运动恢复结构（Structure-from-Motion, SfM）方法完成三维重建。其中，光学正射影像与数字高程模型（Digital Elevation Model, DEM）通过Agisoft Metashape（版本1.7.3）进行后期处理；热红外数据的预处理工作在Thermoviewer（v3.0.7）中完成，热镶嵌图则由Pix4Dmapper（v4.5.6）生成。所有数据均投影至WGS 1984 UTM 19南带全球坐标系。热红外正射影像通过ArcMap（版本10.8）与2020年采集的光学正射影像完成地理配准。本次研究所使用的无人飞行器系统及运动恢复结构衍生成果详情如下： (1) 2017年采集的光学正射影像（分辨率7.7 cm/像素）与数字高程模型（分辨率15.6 cm/像素）：数据采集平台为DJI Mavic Pro Platinum无人机 (2) 2020年采集的光学正射影像（分辨率7.0 cm/像素）与数字高程模型（分辨率13.7 cm/像素）：数据采集平台为DJI Phantom 4 RTK无人机 (3) 2020年补充采集的光学正射影像（分辨率5.3 cm/像素）：数据采集平台为DJI Mavic 2无人机 (4) 2020年采集的热红外正射影像（空间分辨率：45.0 cm/像素，辐射分辨率：0.04度/像素）：搭载于DJI Phantom 4 RTK的FLIR Tau 2 640热成像仪