Topographic point clouds of proglacial area (Jamtal valley, Austria)

The photogrammetrically derived dense point clouds (dpc) for three UAV-based surveys are enclosed to the package S1 as supplementary materials. The files are named ‘DPC_OWA_Jamtal_YYYYMMDD’ which indicate the respective survey place and date. The uniform extent is clipped to the investigated active outwash area (OWA) of the Jamtalferner glacier with an outward buffer of 2 meters. The point clouds are assigned ‘RGB’ values and scalar fields for ‘Intensity’ and surface ‘Roughness (0.15)’ for a kernel size of 0.15 m as used for D84 calculations. The data is provided in ETRS89 UTM zone 32N (EPSG:25832) as spatial reference and is corrected according to the geodetic reference system GRS80, using a constant correction factor of – 51.283 m (mean ∆z = – 51.2828 m ± 0.0027 m). The files are stored as CloudCompare entities (*.bin) for efficient data processing. The point clouds have been filtered as part of the post-processing in Agisoft Metashape Professional (v 1.7.2.) excluding points with confidence values < 5. No further filters or alignments were applied to the point clouds.三次基于无人机航测生成的摄影测量密集点云（Dense Point Clouds, DPC）已作为补充材料封装于S1数据包中。文件命名格式为‘DPC_OWA_Jamtal_YYYYMMDD’，其中字段分别对应航测的地点与日期信息。数据范围已被裁剪至研究对象——Jamtalferner冰川的活跃冰碛扇（active outwash area, OWA）区域，并向外增设了2米的缓冲范围。该点云搭载RGB色彩值，以及用于D84计算、基于0.15米核尺寸的‘强度（Intensity）’与地表‘粗糙度（0.15）’标量场。本数据集采用ETRS89 UTM 32N（EPSG:25832）作为空间参考坐标系，并依据GRS80大地参考系完成坐标校正，校正常数为-51.283米（平均高程偏差∆z = -51.2828米 ± 0.0027米）。为提升数据处理效率，所有文件以CloudCompare实体格式（*.bin）存储。在Agisoft Metashape Professional（v1.7.2）的后处理流程中，已对点云执行滤波操作，剔除了置信度值小于5的点；未对点云施加任何额外的滤波或配准操作。