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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

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Forest Ecosystems 2020年第4期7卷 704-715页

作者： Tong Sun Jianbo Qi Huaguo Huang State Forestry and Grassland Administration Key Laboratory of Forest Resources and Environmental Management Beijing Forestry UniversityBeijing 100083China

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.

关键词： Forest height global map ATL08 products Comparison Plantation

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On Skeleton Extraction Algorithm for Path Planning of Mobile Robots in Complex Planar maps

On Skeleton Extraction Algorithm for Path Planning of Mobile...

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第二十九届中国控制会议

作者： LI Ming,WANG Jun,ZHU Meiqiang School of Information and Electrical Engineering,China University of Mining and Technology,Xuzhou 221008,P.R.China

For path planning in complex maps,this paper proposes skeleton extraction algorithm to realize initial path generation in two-dimensional *** extraction algorithm can reduce the dimension of two-dimension maps,and transform it to one-dimension feasible path map by extracting skeleton of planar *** long as a path connecting starting point and target point is found based on the skeleton,path planning and optimization can be achieved in complex ***,skeleton extraction can be applied to path planning of mobile robots in complex planar *** skeleton extraction algorithm is simulated and its efficiency is validated in simulation condition.

关键词： Skeleton Extraction Path Planning global map Real-Time Path Planning

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