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 st