期刊名称：ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
印刷版ISSN：2194-9042
电子版ISSN：2194-9050
出版年度：2005
卷号：XXXVI-3/W19
页码：204-208
出版社：Copernicus Publications
摘要：It is well known that characteristics of individual trees, such as tree height, biomass and crown area, can be derived from airborne laser scanning (ALS) and that heights for individual trees can be obtained with an accuracy of 0.5 to 1.5 m. However, the ability to measure the growth of individual trees using ALS has not been documented. This paper reports multi-temporal laser surveys conducted in a boreal forest zone suggesting that the height growth for individual trees can be measured with an accuracy better than 0.5 m. Methods to automatically extract height growth of tree crowns are presented. It is expected that similar methods are feasible for reference measurements in studies analyzing global forest changes and the carbon sink, in national forest inventories, and in describing the effects of global warming on forest growth
