Zhifeng Guo

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—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(More)
—A 3-D coherent radar backscatter model for forest canopies was developed and used to improve the understanding of synthetic aperture radar (SAR) interferometric data. The model was based on a realistic 3-D spatial structure of a forest stand, in which every scatterer has its deterministic location. A backscat-tering signal from a scatterer was mapped into(More)
—The digital elevation model from the Shuttle Radar Topography Mission (SRTM) and the National Elevation Dataset (NED) have been used to estimate the forest canopy height. Most of such studies have been conducted over flat areas; the method performance has not been carefully examined over mountainous areas. This study, which is conducted over two(More)
Problem Forest canopy height is essential information for many forest management activities and is also a critical parameter in models of ecosystem processes and in better quantifying the terrestrial carbon cycle [1, 2]. Several categories of methods are available to measure canopy height from remote sensing technology, one of which is the Polarimetric(More)
Forest biomass and other structure parameters are important for describing the function and productivity of forest ecosystem. The signature from Light detection and ranging (Lidar) waveform and Synthetic Aperture Radar (SAR) backscattering is sensitive to some structure and bio-physical information of forest ecosystems. The vertical distribution of(More)
Forest aboveground biomass (AGB) was mapped throughout China using large footprint LiDAR waveform data from the Geoscience Laser Altimeter System (GLAS) onboard NASA's Ice, Cloud, and land Elevation Satellite (ICESat), Moderate Resolution Imaging Spectro-radiometer (MODIS) imagery and forest inventory data. The entire land of China was divided into seven(More)
The alkaloids in the processed Rhizoma Corydalis and the crude Rhizoma Corydalis were qualitatively and semiquantitatively analyzed using gas chromatography-mass spectrometry (GC/MS) method. The processing herb drug procedure was carried out according to the standard method of Chinese Pharmacopoeia. The samples were extracted using Soxhlet extractor with(More)