I just began on a project recently with an established code base. Currently, one of the procedures in the spotlight at the moment is one which creates a lat long mask, a region of interest, specified by the user. Here is my issue. The envi calls used to create this mask are ENVI_CREATE_ROI, ENVI_DEFINE_ROI, ENVI_SAVE_ROIS, ENVI_GET_ROI, ENVI_GET_ROI_DATA, and the ENVI_ROI_TO_IMAGE_DOIT functions. These create a mask and a header file just fine, except for one issue. We would like to use a .25 degrees per pixel ratio, as opposed to the .5 degrees per pixel specified in the mask header file. Have I missed something in specifying this ratio? What command generates the Header file? Are there extra parameters I could pass to create a header with this new ratio? Currently, we hand-edit the header file to use the .25 ratio. We would like to make this automated. Thank you for your time.