James_et_al_2020_BdA_90m_00degr_nadir

James et al. (2020) - Mitigating systematic error in topographic models for geomorphic change detection: Accuracy, precision and considerations beyond off-nadir imagery<br>UAV-collected image dataset and associated image coordinates of GCP observations for surveys of la Borgne d'Arolla. See paper for details.<br>90m_00degr_nadir : UAV image data<br>File formats for image observations:.xml file contains GCP image observations (and other data) exported from Photoscan v1.4.2. Can be imported back into PhotoScan (or Metashape) using Import -&gt; Markers.<br>.txt file contains GCP image observations as pixel coordinates given with respect to an origin in the top left image corner (tab-delimited text file). Note that the .txt file will contain a smaller number of observations than the .xml file, because only GCP observations that have been included in the bundle adjustment have been converted to .txt. The .xml files contain some additional unused observations (shown as grey furled flags in PhotoScan).

James等人（2020）——《面向地貌变化检测的地形模型系统性误差抑制：准确度、精密度及非天底角影像之外的考量》
本数据集包含无人机（Unmanned Aerial Vehicle, UAV）采集的影像数据，以及用于拉博尔讷达罗莱（la Borgne d'Arolla）野外测量的地面控制点（Ground Control Point, GCP）观测影像坐标相关信息，详细内容请参见所属研究论文。
90m_00degr_nadir：无人机影像数据
影像观测数据的文件格式说明：.xml格式文件包含从Photoscan v1.4.2导出的地面控制点影像观测数据及其他附属数据，可通过导入→标记点功能重新导入至PhotoScan（或Metashape）软件中。
.txt格式文件包含地面控制点影像观测数据，其像素坐标以影像左上角为坐标原点，该文件为制表符分隔的文本文件。需注意，.txt文件中的观测数据量少于.xml文件，这是因为仅纳入光束法平差（bundle adjustment）流程的地面控制点观测数据才会被转换为.txt格式。.xml格式文件则包含部分未被使用的额外观测数据，在PhotoScan软件中该类数据显示为灰色折叠标记旗。