Maybe it is worth pointing out that Ordinary Kriging with a 'global neighbourhood' (using all the points in simple speak) is the same as Simple Kriging with a neighbourhood which extends to the range of influence of the semi-variogram model (if any).
Given this fact, you would be computationally safer to do Simple Kriging - otherwise known as "kriging with known mean" and saving yourself the problems of enormous and sparse matrix solutions. The only overhead to Simple Kriging is producing a reliable estimate of the global mean and, to be realistic, a standard error associated with it. Isobel Clark http://geoecosse.bizland.com/courses.htm ________________________________________________________________________ Want to chat instantly with your online friends? Get the FREE Yahoo! Messenger http://uk.messenger.yahoo.com/ -- * To post a message to the list, send it to [EMAIL PROTECTED] * As a general service to the users, please remember to post a summary of any useful responses to your questions. * To unsubscribe, send an email to [EMAIL PROTECTED] with no subject and "unsubscribe ai-geostats" followed by "end" on the next line in the message body. DO NOT SEND Subscribe/Unsubscribe requests to the list * Support to the list is provided at http://www.ai-geostats.org
