General introduction to satellite remote sensing of coral reef bleachingPAN Yan-Li1,2 , TANG Dan-Ling1,2,* Quantitative Remote Sensing Study of the Cover of a Sand Artemisia ordosica Community Relativity research on near-ground and satellite remote sensing reflectance of wheat stripe rust A Study on the Grassland Forage Yield Forecasting Using Projection Pursuit Regression (PPR) Technology Estimation of Regional Cotton-Rice and Rice-Cotton Rotation Periods Based on Satellite Remote Sensing Methodology Changes of winter wheat planting area detected by using multitemporal remote sensing images—A case study from Sanhe City and Hui Autonomous Co unty of Dachang of Hebei Province