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	Retrieval of Forest Biomass From ALOS PALSAR Data Using a Lookup Table Method
	Ni W. J. ; Sun G. Q. ; Guo Z. F. ; Zhang Z. Y. ; He Y. T. ; Huang W. L.
	2013
关键词	Lookup table ALOS PALSAR forest biomass model terrain effect radiometric slope correction radar backscatter sar data aboveground biomass model topography inversion
英文摘要	Mapping of forest biomass over large area and in higher accuracy becomes more and more important for researches on global carbon cycle and climate change. The feasibility and problems of forest biomass estimations based on lookup table (LUT) methods using ALOS PALSAR data are investigated in this study. Using of the forest structures from a forest growth model as inputs to a three dimensional radar backscattering model, a lookup table is built. Two types of searching methods (Nearest Distance (ND) and Distance Threshold (DT)) are used to find solutions from lookup table. When a simulated dataset is used to test the lookup table, the RMSE of biomass estimation are 39.133 Mg/ha (R-2 = 0.748) from ND and 26.699 Mg/ha (R-2 = 0.886) from DT using dual-polarization data for forest with medium rough soil surface. All results show that DT is superior to ND. Comparisons of biomass from forest inventory data with that inversed from look up table using DT method over eight forest farms shows RMSE of 18.564 Mg/ha and 15.392 Mg/ha from PALSAR data with and without correction of the scattering mechanism, respectively. For the entire Lushuihe forest Bureau, the errors of the biomass estimation are -13.8 Mg/ha (-8.6%) and -5.5 Mg/ha (-3.5%) using PALSAR data with and without correction of scattering mechanisms due to terrain, respectively. The results shows that the radar image corrected data could be directly used for biomass estimation using the lookup table method.
出处	Ieee Journal of Selected Topics in Applied Earth Observations and Remote Sensing
卷	6
期	2
页	875-886
收录类别	SCI
语种	英语
ISSN号	1939-1404
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/30333]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Ni W. J.,Sun G. Q.,Guo Z. F.,et al. Retrieval of Forest Biomass From ALOS PALSAR Data Using a Lookup Table Method. 2013.

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