Hello -- I'm rather new to IDL so please, if this question is answered in some basic reference material, just point me towards it. I'm trying to set up a basic set of modis processing steps for hundreds of images. I just want to convert the hdfs (convert_modis_data), reproject to utm (envi_convert_file_map_projection), and reorder the bands (existing custom code). I'm wondering about best practices for batching multiple steps together, each of which will, by default, create a file output. It seems better to to run through each of these steps and only have one new file output. I'm not sure the best way to do this though. Is this making use of IN_MEMORY? If so, I wasn't allowed to use this flag for the envi_convert_file_map_projection call. Other suggestions? Any thoughts (or nudges towards useful existing resources) are much appreciated , Mike