--- Start of Idrisi List message Hi everyone, Now I have another problem. I have two satellite images five years apart, which have been analysed to find NDVI. I also have a (digitised) vector file of the area which divides it into 700 odd parts. My interest is to find change in NDVI in each of these parts. Crosstab only works on the aggregate (whole area) level. Is there any way out? Thanks again for the trouble. I have learnt a lot from the members of this list. I am hopeful somebody would again show me the way. cheers. vivek Vivek K.Varma Department of Forestry Institute of Land and Food Resources University of Melbourne, Vic. 3010 Australia Phone: +61 3 8344 5238 (Work); FAX: +61 3 9349 4172 Web site: http://www.GeoCities.com/RainForest/Vines/5953/index.htm --- End of Idrisi List message IDRISI-L is an unmoderated list. As a service to list users, please post a summary of useful responses to your questions. To post a message to IDRISI-L, send it to [EMAIL PROTECTED] To subscribe to the list, send an email from the address to be subscribed to [EMAIL PROTECTED] with "subscribe" (without quotes) as the first line of the message body. To unsubscribe, do the same, only with "unsubscribe" as the first line of the message body.