NEIGAE OpenIR
Estimation of Forest Above-Ground Biomass by Geographically Weighted Regression and Machine Learning with Sentinel Imagery
L. Chen, C. Y. Ren, B. Zhang, Z. M. Wang and Y. B. Xi
2018
发表期刊Forests
卷号9
摘要Accurate forest above-ground biomass (AGB) is crucial for sustaining forest management and mitigating climate change to support REDD+ (reducing emissions from deforestation and forest degradation, plus the sustainable management of forests, and the conservation and enhancement of forest carbon stocks) processes. Recently launched Sentinel imagery offers a new opportunity for forest AGB mapping and monitoring. In this study, texture characteristics and backscatter coefficients of Sentinel-1, in addition to multispectral bands, vegetation indices, and biophysical variables of Sentinal-2, based on 56 measured AGB samples in the center of the Changbai Mountains, China, were used to develop biomass prediction models through geographically weighted regression (GWR) and machine learning (ML) algorithms, such as the artificial neural network (ANN), support vector machine for regression (SVR), and random forest (RF). The results showed that texture characteristics and vegetation biophysical variables were the most important predictors. SVR was the best method for predicting and mapping the patterns of AGB in the study site with limited samples, whose mean error, mean absolute error, root mean square error, and correlation coefficient were 4 x 10(-3), 0.07, 0.08 Mgha(-1), and 1, respectively. Predicted values of AGB from four models ranged from 11.80 to 324.12 Mgha(-1), and those for broadleaved deciduous forests were the most accurate, while those for AGB above 160 Mgha(-1) were the least accurate. The study demonstrated encouraging results in forest AGB mapping of the normal vegetated area using the freely accessible and high-resolution Sentinel imagery, based on ML techniques.
文献类型期刊论文
条目标识符http://ir.iga.ac.cn/handle/131322/9162
专题中国科学院东北地理与农业生态研究所
作者单位中国科学院东北地理与农业生态研究所
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GB/T 7714
L. Chen, C. Y. Ren, B. Zhang, Z. M. Wang and Y. B. Xi. Estimation of Forest Above-Ground Biomass by Geographically Weighted Regression and Machine Learning with Sentinel Imagery[J]. Forests,2018,9.
APA L. Chen, C. Y. Ren, B. Zhang, Z. M. Wang and Y. B. Xi.(2018).Estimation of Forest Above-Ground Biomass by Geographically Weighted Regression and Machine Learning with Sentinel Imagery.Forests,9.
MLA L. Chen, C. Y. Ren, B. Zhang, Z. M. Wang and Y. B. Xi."Estimation of Forest Above-Ground Biomass by Geographically Weighted Regression and Machine Learning with Sentinel Imagery".Forests 9(2018).
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