Discovering forest height changes based on spaceborne lidar data of ICESat-1 in 2005 and ICESat-2 in 2019:a case study in the Beijing-Tianjin-Hebei region of China

作     者：Tong Sun Jianbo Qi Huaguo Huang Tong Sun;Jianbo Qi;Huaguo Huang

作者机构：State Forestry and Grassland Administration Key Laboratory of Forest Resources and Environmental ManagementBeijing Forestry UniversityBeijing 100083China 

出 版 物：《Forest Ecosystems》 (森林生态系统（英文版）)

年 卷 期：2020年第7卷第4期

页      面：704-715页

核心收录：

学科分类：090704[农学-森林经理学] 0907[农学-林学] 09[农学] 

基　　金：National Natural Science Foundation of China:41971289 

主　　题：Forest height Global map ATL08 products Comparison Plantation 

摘      要：Background:The assessment of change in forest ecosystems,especially the change of canopy heights,is essential for improving global carbon estimates and understanding effects of climate *** lidar systems provide a unique opportunity to monitor changes in the vertical structure of ***’s Ice,Cloud and Land Elevation Satellites,ICESat-1 for the period 2003 to 2009,and ICESat-2(available since 2018),have collected elevation data over the Earth’s surface with a time interval of 10 *** this study,we tried to discover forest canopy changes by utilizing the global forest canopy height map of 2005(complete global coverage with 1 km resolution)derived from ICESat-1 data and the ATL08 land and vegetation products of 2019(sampling footprints with 17 m diameter)from ***:Our study revealed a significant increase in forest canopy heights of China’s Beijing-Tianjin-Hebei *** of unchanging areas for data consistency of two products show that the bias values decreased significantly from line-transect-level(−8.0 to 6.2 m)to site-level(^(−1).5 to 1.1 m),while RMSE values are still relatively high(6.1 to 15.2 m,10.2 to 12.0 m).Additionally,58%of ATL08 data are located in‘0m’pixels with an average height of 7.9 m,which are likely to reflect the ambitious tree planting programs in ***:Our study shows that it is possible,with proper calibrations,to use ICESat-1 and-2 products to detect forest canopy height changes in a regional *** expect that the approach presented in this study is potentially suitable to derive a fine-scale map of global forest change.