说明：  文件为IDL程序代码，在ENVI+IDL环境下运行。处理遥感图像，生成NDVI、TNDVI、RVI等植被指数，为后续研究提供基础
(Program code for the IDL files in ENVI+ IDL environment to run. Remote sensing image processing to generate NDVI, TNDVI, RVI and other vegetation indices, provide a basis for further study)