九寨沟西番沟泥石流DEM数据（2019-2021）

该数据为九寨沟西番沟泥石流的DEM数据，采用飞马V10无人机搭载RIEGL VUX-1LR机载激光雷达系统获取，通过机载激光雷达技术去除植被后生成的DEM数据，能得到真实的地表形态为泥石流物源的识别与计算提供新的解决方案；数据采用芬兰 Arttu Soininen 工程师开发的TerraSolid软件，通过形成宏命令经点云去噪、滤波、分类后，获取研究区真实地表点云数据，进而利用分类出的地面点构建了高精度数字高程模型；获取的激光点云数据平均密度优于50点/m2，数字高程模型分辨率为0.5m，坐标系为CGCS2000国家坐标系，1985国家高程基准；基于机载LiDAR数据开展泥石流物源识别与计算工作，根据物源所处的位置以及在山体阴影图像上的色彩及纹理差异，将物源分为崩滑物源、坡面物源和沟道物源并建立各类型物源的机载LiDAR识别标志与遥感解译方法，为泥石流物源的精确计算提供理论参考和数据支撑，进一步服务于泥石流的防治与风险评价。

This dataset is DEM (Digital Elevation Model) data for debris flow in Xifan Gully, Jiuzhaigou. It was acquired using the Pegasus V10 UAV equipped with the RIEGL VUX-1LR airborne LiDAR system, and the DEM data was generated by removing vegetation via airborne LiDAR technology. The obtained real surface topography provides a new solution for the identification and calculation of debris flow source materials.

The data was processed using TerraSolid software developed by Finnish engineer Arttu Soininen. Real surface point cloud data of the study area was acquired by creating macro commands to perform point cloud denoising, filtering and classification. Furthermore, a high-precision digital elevation model was constructed using the classified ground points. The acquired LiDAR point cloud data has an average density exceeding 50 points per square meter, with the DEM having a resolution of 0.5 m, adopting the China Geodetic Coordinate System 2000 (CGCS2000) and the 1985 National Height Datum.

Subsequently, debris flow source material identification and calculation were conducted based on the airborne LiDAR data. According to the location of the source materials and the differences in color and texture on mountain shadow images, the source materials are categorized into three types: collapse-slide source materials, slope source materials and gully source materials. Meanwhile, airborne LiDAR identification markers and remote sensing interpretation methods for each type of source material are established, providing theoretical references and data support for the accurate calculation of debris flow source materials, and further serving debris flow prevention, control and risk assessment.