sol-LAUT – Point clouds and hemispherical photographs for solar radiation modeling from Austrian forest inventory plots

The amount of solar radiation reaching the forest floor is a crucial parameter for the abundance and vitality of regenerating trees. Therefore, its quantification and characterization are of particular importance for forest management. The calculation of below-canopy light regime from forest point clouds collected with personal laser scanners offers an opportunity to assess the necessary metrics without the requirement of any additional data collection. This dataset contains 3D point cloud data collected on 40 forest inventory plots in Austria, which can be found in the folder ‘PointClouds’. The scanner used for data acquisition was a mobile personal laser scanner (PLS) (ZEB Horizon, GeoSLAM Ltd., Nottingham, UK). Furthermore, hemispherical photographs were taken at the same forest plots using the Solariscope SOL 300 (Behlin, Wedemark, Germany) as well as a Canon EOS 5D camera (Canon Inc., Ōta, Tokyo, Japan) mounted on a SLM9 self-levelling mount (Delta-T Devices Ltd., Burwell, Cambridge, UK) together with HemiView software (Delta-T Devices Ltd., 2016). The raw and classified images can be found in the corresponding subfolders (‘HemiView’ or ‘Solariscope’) in the folder ‘HemisphericalPhotography’. Additionally, the results obtained with the classified images of Solariscope and HemiView are included in the output files. Note that the results from the Solariscope survey represent average values over a predefined time span, in this case from April 1 to September 30, 2022. Also, the range of solar zenith angles considered for the analyses was set from 0 to 50° in the device settings, meaning that radiation values originating from moments with a solar elevation angle below 40° were not included into the calculations. The file 'Plots.csv' contains the geographical coordinates of the inventory plots (columns 'X' and 'Y', EPSG:31286). The file 'treespecies.csv' gives information on the percentage of tree species at each plot, which is necessary for the calculation of a plot-wise canopy extinction coefficient.到达林地表层的太阳辐射量是影响更新树木丰度与活力的关键参数。因此，对其进行量化与特征描述对于森林经营管理具有特殊重要意义。利用个人激光扫描仪采集的森林点云数据计算冠层下光照状况，无需额外开展数据采集即可获取所需评估指标。 本数据集包含奥地利境内40个森林调查样地的三维点云数据，存储于“PointClouds”文件夹中。数据采集所用设备为移动式个人激光扫描仪（personal laser scanner, PLS）——ZEB Horizon，购自英国诺丁汉郡GeoSLAM有限公司。此外，研究团队使用Solariscope SOL 300（德国韦德马克Behlin公司），以及搭载于SLM9自调平支架（英国剑桥郡伯韦尔Delta-T设备有限公司）的佳能EOS 5D相机（日本东京大田区佳能株式会社），配合HemiView软件（Delta-T设备有限公司，2016），在相同的森林样地上拍摄了半球摄影照片。原始图像与分类后图像均存储于“HemisphericalPhotography”文件夹下对应的子文件夹（“HemiView”或“Solariscope”）中。此外，通过Solariscope与HemiView分类图像生成的分析结果也包含于输出文件中。请注意，Solariscope测量得到的结果为预定义时间跨度内的平均值，本次研究的时间跨度为2022年4月1日至9月30日。此外，设备设置中将分析所用的太阳天顶角范围设为0°至50°，这意味着太阳高度角低于40°时刻的辐射数值未被纳入计算。“Plots.csv”文件包含各调查样地的地理坐标（列名“X”与“Y”，坐标系为EPSG:31286）。“treespecies.csv”文件提供了各样地的树木物种占比信息，该信息是计算样地尺度冠层消光系数的必要参数。