Comparison of Vegetation Indices and Red-edge Parameters for Estimating Grassland Cover from Canopy Reflectance Data Evaluation of stress in the seedlings of succession typical species induced by acid rain using hyperspectral remote sensing Red-edge characteristics of winter wheat canopy spectra Relational analysis of spectra and red-edge characteristics of plant leaf and leaf biochemical constituent Hyperspectral characteristics of typical subtopical trees at different levels of simulated acid rain