SfM data of the Kongur normal fault (Qimugan site), Pamir, China, Aug. 2018

This dataset covers the terraces at the outlet of the Qimugan river (E 74.592°, N 39.089°), located in the Muji basin in Pamir, northwestern China. These terraces are offset by vertical motion along the frontal Kongur normal fault dipping west. We collected 4676 images (5472 × 3648 pixels) covering a ~1.9 km2 of the research area using a consumer UAV DJI Phantom Professional V2.0. The Structure from Motion (SfM) point clouds was produced by using the commercial Photoscan Pro software (Photoscan). The SfM point cloud density was ~195 points/m2 which could yield a ~7.16 cm resolution DEM. In this project, the Surfer software was utilized to build the 0.2 m resolution DEM from the dense point cloud. This project was funded by the China National Science Foundation (Grant Numbers: 41802229 and 41772221). The primary motivation for the acquisition of the data set was a study of young fluvial terrace riser degradation.
Before taking aerial photographs, 13 ground control points (GCPs) were distributed throughout the study area for georeferencing purposes. Then, 11 GCPs were implemented in the processing, removing the other two GCPs (marker 4 and 6) with big errors). The survey of the markers was completed using a Trimble Geo 7X GNSS system that involves two units: fixed reference station and roving receiver. Each target center was recorded at least 15 times by the roving receiver with a 5 cm receiving accuracy. Then, precise positions of these markers were obtained by GPS post-processing software of Trimble Company. All points were acquired in WGS84/ UTM zone 43N.

本数据集涵盖了位于中国西北部帕米尔高原木孜盆地、祁木干河出口（东经74.592°，北纬39.089°）处的阶地。这些阶地沿前端公格尔正断层的西倾方向发生垂直运动。我们使用民用无人机DJI Phantom Professional V2.0收集了4676张图像（5472×3648像素），覆盖了约1.9平方公里的研究区域。通过使用商业软件Photoscan Pro（简称Photoscan）生成的运动结构（SfM）点云，点云密度约为195点/平方米，从而能够产生约7.16厘米分辨率的数字高程模型（DEM）。在本项目中，利用Surfer软件从密集点云构建了分辨率为0.2米的DEM。该项目由中国国家自然科学基金资助（资助编号：41802229和41772221）。收集数据集的主要动机是对年轻河成阶地隆起侵蚀的研究。在拍摄航空照片之前，为地理定位目的，在研究区域内均匀分布了13个地面控制点（GCPs）。随后，在处理过程中实施了11个GCPs，移除了两个误差较大的GCPs（标记4和6）。使用Trimble Geo 7X GNSS系统对标记进行了测量，该系统包括两个单元：固定参考站和移动接收器。移动接收器至少记录了每个目标中心的15次，接收精度为5厘米。然后，通过Trimble公司的GPS后处理软件获得了这些标记的精确位置。所有点均采用WGS84/UTM区43N坐标系获取。