When writing IDL programmes to convert EVF file to ROIs, I found that by using ENVI_CREATE_ROI,ENVI_DEFINE_ROI and other functions just like thisto convert EVF file to ROIs (http://groups.google.com/...d/d542f3637e107e20), the convert results contain many obvious blank holes in case of there exists a large region.In fact ,there blank holes should be convert into a single ROIs .But in the ENVI software, the convert results are correct by using the menu ?file->export activelayer to rois? in the vector display window.I doubt the ENVI_EVF_READ_RECORD function in the programme does not get the correct record info,such as the map coordinates.How would me to solve this problem,any help would be appreciated! The uncorrected results is demoed as follow picture: