Plant area density measurements provide spatially explicit information about the density and distribution of canopy elements. This information is needed for modeling of the forest radiation regime, climate and for other ecological applications. Terrestrial laser scanning (TLS) provides detailed information about canopy structure, but it cannot be used for monitoring large areas. Airborne laser scanning (ALS) uses similar methods to measure plant area density, but due to the larger beam footprints, the scale at which this information can be obtained is coarser than with TLS. The volumetric nature of the ALS measurement poses unique geometric challenges to plant area measurement methods, as assuming an infinitesimal beam size may lead to large errors. Further, the use of voxel grids with ALS measurements may increase errors in plant area measurements, as these grids require discrete spatial allocation of information.

中文翻译：

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质疑体素网格：在北方和半北方针叶林和阔叶林中使用机载波形激光雷达对叶面积密度进行半连续采样


植物面积密度测量提供了有关冠层元素密度和分布的空间明确信息。这些信息对于森林辐射状况、气候和其他生态应用建模是必需的。地面激光扫描 （TLS） 提供有关冠层结构的详细信息，但不能用于监测大面积区域。机载激光扫描 （ALS） 使用类似的方法来测量植物面积密度，但由于光束占用空间较大，因此可以获得此信息的比例比 TLS 更粗糙。ALS 测量的体积特性对工厂面积测量方法提出了独特的几何挑战，因为假设光束尺寸极小可能会导致较大的误差。此外，将体素格网与 ALS 测量一起使用可能会增加植物面积测量的误差，因为这些格网需要信息的离散空间分配。