Hello, In our company we are orthorectifying a very large amount of images. For now we just use the GUI of ENVI (Map > Orthorectification) to do the job, but it is very time consuming. I am trying to automate the process, and it seemed clear that IDL was the right tool. However, I have not been able to find an API to call ENVI's orthorectification module from IDL. Is it possible in the first place? And if it is not possible, does anybody know a way to automate this process? Thanks in advance, Chris Wouters Geoserve BV