This paper presents a novel algorithm for calculation of plant area density based on surface and volume convex hull which is applied to each horizontal cut of a point cloud data. This method can be used as an alternative to conventional voxelization approaches to improve accuracy and computation efficiency. The terrestrial data was collected from a boreal forest at Peace River, Alberta, Canada during summer and fall in 2014. This technique can be applied to an arbitrary point cloud data to calculate all other metrics of forests including plant area index, leaf area density, and also leaf area index.
Leila Taheriazad, Hamid Moghadas, and Arturo Sanchez-Azofeifa, "A new approach to calculate Plant Area Density (PAD) using 3D ground-based lidar," Proc. SPIE 10005, Earth Resources and Environmental Remote Sensing/GIS Applications VII, 1000518 (Presented at SPIE Remote Sensing: September 29, 2016; Published: 18 October 2016); https://doi.org/10.1117/12.2241867.
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Study of self-shadowing effect as a simple means to realize nanostructured thin films and layers with special attentions to birefringent obliquely deposited thin films and photo-luminescent porous silicon