Data and code for: Grain size of fluvial gravel bars from close-range UAV imagery – uncertainty in segmentation-based data

UAV images used for SfM model generation and all images (both SI and OM), in which we measured grain sizes. The code used for image processing and uncertainty estimation of grain size distributions as python files and executable jupyter notebooks, where the latter also serve as documentation.用于生成运动恢复结构（Structure from Motion，SfM）模型的无人机（Unmanned Aerial Vehicle，UAV）影像，以及所有已开展粒径测量的影像（涵盖SI与OM两类影像）。配套的图像处理与粒径分布不确定性估计代码以Python脚本文件与可执行Jupyter Notebook的形式提供，其中Jupyter Notebook同时兼具文档功能。