Measuring the Growth of Individual Trees Usingmulti-temporal Airborne Laser Scanning Point Clouds
نویسندگان
چکیده
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.
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