EO-1 ALI is a supported format in ENVI 5.3: http://www.harrisgeospatial.com/docs/... You can use the Radiometric Calibration tool to convert the data to TOA radiance or reflectance: http://www.harrisgeospatial.com/docs/... If you have a license for the Atmospheric correction module, which includes FLAASH and Quac, you can then calibrate to surface reflectance, or one of the built-in tools to convert to relative reflectance: http://www.harrisgeospatial.com/docs/...

Thank you, Mari Your suggestion was very much helpful for me. I can do it now.