I'm not sure what happened to my other thread, it appears to have been somewhat mangled on page 2! I'll repeat what I posted there. I'm new to LiDAR and am trying to view our strips in ENVI. The data is currently in .all ASCII format with 9 fields, of which fields 2-5 are x, y, z and i from the last pulse and fields 6-9 are the corresponding values for the first pulse. When trying to use the 'ASCII to LAS' function I downloaded as part of the LiDAR Tools from the code library, using the 'In File' option as I assumed it was a default, I got an error message. Can anyone offer me any helpful pointers as to how to approach converting the data so I can view it? I guess I'm doing something wrong but can't put my finger on it. Thanks, Chris Wilson, University of Chester, UK