Estimation of Aboveground Biomass in Alpine Forests: A Semi-Empirical Approach Considering Canopy Transparency Derived from Airborne LiDAR Data

Sensors

Andreas Jochem¹  Markus Hollaus³  Martin Rutzinger² 

[1] alpS-Centre for Climate Change Adaptation Technologies, Grabenweg 3, 6020 Innsbruck, Austria;University of Innsbruck, Department of Geography, Innrain 52, 6020 Innsbruck, Austria; E-Mail:;Vienna University of Technology, Institute of Photogrammetry and Remote Sensing, 1040 Vienna, Austria; E-Mail:

关键词: airborne LiDAR;    biomass;    semi-empirical model;    3D point cloud;    linear regression;   

DOI  :  10.3390/s110100278

来源: mdpi

【 摘 要 】

In this study, a semi-empirical model that was originally developed for stem volume estimation is used for aboveground biomass (AGB) estimation of a spruce dominated alpine forest. The reference AGB of the available sample plots is calculated from forest inventory data by means of biomass expansion factors. Furthermore, the semi-empirical model is extended by three different canopy transparency parameters derived from airborne LiDAR data. These parameters have not been considered for stem volume estimation until now and are introduced in order to investigate the behavior of the model concerning AGB estimation. The developed additional input parameters are based on the assumption that transparency of vegetation can bemeasured by determining the penetration of the laser beams through the canopy. These parameters are calculated for every single point within the 3D point cloud in order to consider the varying properties of the vegetation in an appropriate way. Exploratory Data Analysis (EDA) is performed to evaluate the influence of the additional LiDAR derived canopy transparency parameters for AGB estimation. The study is carried out in a 560 km² alpine area in Austria, where reference forest inventory data and LiDAR data are available. The investigations show that the introduction of the canopy transparency parameters does not change the results significantly according to R² (R² = 0.70 to R² = 0.71) in comparison to the results derived from, the semi-empirical model, which was originally developed for stem volume estimation.

【 授权许可】

CC BY   
© 2011 by the authors; licensee MDPI, Basel, Switzerland.