Photogrammetry Experiment at Fagradalsfjall, Iceland

This dataset contains products from unoccupied aircraft system (UAS) surveys conducted at Fagradalsfjall volcano, Iceland, in May 2024. A survey from May 27, 2024, is located north of Litli-Hrútur and covers the 2023 eruption vent and surrounding area. Two surveys from May 29, 2024, are located at the eastern end of Meradalir valley and includes parts of lava flows emplaced during eruptions in 2021, 2022, and 2023. These two surveys have the same spatial extent. One was flown at 55 meters above ground level (AGL) and the other at 111 m AGL. The purpose of these two flights was to acquire an image dataset at multiple resolutions for simulated virtual surveys through the volume above the target using machine learning to dynamically inform flight planning.The data included for each survey consists of a digital elevation model (DEM), orthomosaic, point cloud, processing report, and original images from the UAS. All data products are presented in the ISN2016 (EPSG:8088) coordinate reference system. The photo locations are in WGS 84 (EPSG:4326).In addition to the survey data and images, there are two key files:READ_ME_AGLexperiment.docx: A Read Me file listing all file types and file names for the dataset.Processing_ AGLexperiment.xlsx: A summary table providing camera and processing information for the three UAS surveys included in the dataset.The UAS surveys were flown by Ingrid Ukstins and Christopher Hamilton, and processed by Brett Carr at the University of Arizona’s Lunar and Planetary Laboratory (LPL). The UAS used was a DJI Mavic 3E paired with a DJI D-RTK 2 High Precision GNSS Mobile Station. Processing was done using Agisoft Metashape Pro v2.0.2 software and following the workflow of Over et al. (2021, U.S. Geological Survey Open-File Report 2021-1039, https://doi.org/10.3133/ofr20211039). Spatial reference for the May 27, 2024, survey of the 2023 vent was done using 8 natural ground control points identified in an orthomosaic created from an airborne survey flight conducted by the Icelandic Institute of Natural History on August 8, (https://zenodo.org/records/6598466). The alignment error calculated by Agisoft Metashape Pro was 0.14 m. Spatial reference for the 55 m AGL flight on May 29, 2024, was provided by the geotagged positions of the images. The photo reference error calculated by Agisoft Metashape Pro for this survey was 0.58 m. Two check points from ground control markers (measured using differential GNSS; Hamilton et al., 2022, https://doi.org/10.25422/azu.data.21084865.v1) have an error of 1.11 m. The 111 m AGL survey from May 29, 2024, was aligned to the 55 m AGL survey using 10 natural ground control points. The alignment error calculated by Agisoft Metashape Pro was 0.02 m.For inquiries regarding the contents of this dataset, please contact the Corresponding Author listed in the README.txt file. Administrative inquiries (e.g., removal requests, trouble downloading, etc.) can be directed to [e-mail] item is part of Fagradalsfjall (Iceland) Eruption collection

本数据集收录了于2024年5月在冰岛法格拉达尔火山进行的无人航空系统（UAS）调查中的产品。其中，2024年5月27日的调查位于利蒂-赫鲁特北部，覆盖了2023年喷发口及其周边区域。2024年5月29日，进行了两次调查，位于梅达达尔山谷的东端，包括2021年、2022年和2023年喷发期间形成的部分熔岩流。这两次调查具有相同的空间范围。一次飞行高度为55米（AGL），另一次为111米（AGL）。这两次飞行的目的是通过机器学习动态指导飞行规划，获取多个分辨率的图像数据集，以模拟虚拟调查通过目标上方的体积。每个调查的数据包括数字高程模型（DEM）、正射影像图、点云、处理报告和UAS原始图像。所有数据产品均以ISN2016（EPSG:8088）坐标参考系统展示。照片位置位于WGS 84（EPSG:4326）。此外，数据集还包括两个关键文件：READ_ME_AGLexperiment.docx（列出数据集所有文件类型和文件名的“阅读我”文件）和Processing_ AGLexperiment.xlsx（提供包含在数据集中三个UAS调查的相机和处理信息的摘要表格）。无人航空系统调查由Ingrid Ukstins和Christopher Hamilton执行，并由亚利桑那大学月球与行星实验室（LPL）的Brett Carr进行处理。所使用的UAS为DJI Mavic 3E，配以DJI D-RTK 2高精度GNSS移动站。处理使用Agisoft Metashape Pro v2.0.2软件完成，并遵循Over等人（2021年，美国地质调查局公开文件报告2021-1039，https://doi.org/10.3133/ofr20211039）的工作流程。2024年5月27日对2023年喷发口的调查的空间参考是通过在冰岛自然历史研究所于2023年8月8日进行的空中调查飞行创建的正射影像图中识别的8个自然地面控制点完成的。由Agisoft Metashape Pro计算的对齐误差为0.14米。2024年5月29日55米（AGL）飞行的空间参考由图像的地理标记位置提供。Agisoft Metashape Pro计算的本调查的照片参考误差为0.58米。两个地面控制标记的检查点（使用差分GNSS测量；Hamilton等人，2022年，https://doi.org/10.25422/azu.data.21084865.v1）的误差为1.11米。2024年5月29日111米（AGL）的调查通过10个自然地面控制点与55米（AGL）的调查对齐。由Agisoft Metashape Pro计算的对齐误差为0.02米。有关本数据集内容的咨询，请联系README.txt文件中列出的通讯作者。行政咨询（例如，删除请求、下载问题等）可发送至[e-mail]。本项是法格拉达尔火山（冰岛）喷发系列的一部分。