Dear all   I hope you can gelp me with this. I just run an orthorectification on a Spot 2 image using a DEM on ENVI 4.5. It improved the positioning of the image considerably, but there are some areas of the image that are still not so good. I was thinking on running georeference the image with a vector layer to correct this areas. Do you think this a good way to go?   The orthorectification on ENVI 4.5 has either the option of using GCPs or DEM but no to use both together as in ENVI 4.6 orthorectification module, so I was wondering if I can use this work-around instead.   What do you think??   Cheers   S