Estimation model of above-ground biomass of grassland in Tarbagatay Prefecture based on Landsat 8 and machine learning
Taking Tarbagatay Prefecture of Xinjiang as the study area,using vegetation index,meteorological data and terrain data as independent variables,combined with the measured biomass data of sample plots in the study area,five machine learning models in-cluding k-nearest neighbors regression(KNN),multiple linear regression(MLR),gradient boosting decision tree(GBDT),random forest regression(RF)and Gradient Boosting Decision Tree(GBDT)were analyzed and compared,as well as two ensemble learning models constructed using voting regressor and stacking methods.The results showed that the stacking ensemble learning model had the best performance,with R2 of 0.764,RMSE and MAE of 23.29 g/m2 and 16.8 g/m2,respectively.The optimal model was then used to in-vert and map above-ground biomass(AGB)of grassland.