--- Start of Idrisi List message Hi I am searching for someone who can guide me getting an algorithm for the gemeration of isochrones in the waterhsed using a DEM . Like something identifying the pixels in the Time Area graph for the Hydrograph and then plot the same pixels in an image format. has somebody worked on this problem? Kindly email. Thanks --- 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. The list is archived at http://www.mail-archive.com/idrisi-l%40clarklabs.org/.