I run the code with ENVI+IDL and have not encountered any error, but I also cannot get any output. I don't why. This code is from the MCTK User's guide. I just change the input & output path and Modis swath file. Any one else encounters this? how to fix? The output is: % Restored file: ENVI. % Loaded DLM: PNG. % Loaded DLM: HPGRAPHICS. % Loaded DLM: XML. ENVI> test_batch_modis_conversion_l2_swath % Compiled module: TEST_BATCH_MODIS_CONVERSION_L2_SWATH. % Loaded DLM: MAP_PE. % Loaded DLM: IDL_IDLBRIDGE. ENVI> I save this code in "C:\Users\hp\IDLWorkspace83\Default" and run it, but nothing I can obtain. Thanks. Qingqing