Estimation of forest aboveground biomass using high spatial resolution remote sensing imagery Estimation of forest above-ground biomass based on HJ1B and ALOS/PALSAR remote sensing data Forest Above-Ground Biomass Estimation Method for Rugged Terrain Based on Airborne P-Band PolSAR Data Estimating Forest Above-Ground Biomass in the Upper Reaches of Heihe River Basin Using Multi-Spectral Remote Sensing Preparation of breviscapin calcium alginate gel beads