Hello, I'm new to LiDAR data and am trying to convert our ASCII data (with the .all extension) to LAS format in ENVI using the LiDAR tools from the code library. However when attempting to do this I get this error message: " Subscript range values of the form low:high must be >=0, Execution halted at: ASCIITOLAS 298 C:\RSI\IDL63\products\envi43\save_add\LiDARTools\procedures\asciitolas.pro $MAIN$ " The files contain 9 fields with last pulse x, y, z and i data in fields 2-5, and the corresponding first pulse data in fields 6-9. Can anyone tell me where I'm going wrong? Thanks, Chris Wilson