Hi GRASS users, How can I compute Vegetation Indices (like Ratio, NDVI, RVI, TVI, CTVI, TTVI etc.) in GRASS as we can do it in IDRISI. Thanks in advance. uttam. _________________________________________________________________ Join BharatMatrimony.com. http://www.bharatmatrimony.com/cgi-bin/bmclicks1.cgi?72 Unmarried? Join Free.