Analysis of new characteristics of the first Landsat 8 image and their eco-environmental significance Quantification of crop residue burned areas based on burning  indices using Landsat 8 image. Scaling-up methodology for alpine grassland coverage monitoring based on Landsat 8 OLI and MODIS remote sensing data: A case study in XiaheSangke grassla Mapping of Carya cathayensis Spatial Distribution with Linear Spectral Mixture Model