Koen > I think it's called a "block to block" variogram > average, not sure. It is called the "within block variance". Block to block variance is the variance between block averages - i.e. from block to block.
> As I explained, I'm looking for an easy way to > estimate the gamma(V,V) value. If you have a standard semi-variogram model such as the spherical or exponential, the mathematical formulae for two dimensional blocks are published in various issues of Computers and Geosciences. Point approximations are only necessary if you have a non-readitional model or rotational geometric anisotropy. > I used matlab to code for the distances between > pairs but, it takes so much time compared to ..... Most software packages use the symmetry of the block so that only about one-quarter of the calculation need to be carried out. You can get the within block variance from our kriging game for all the models we cover. It is written onto the screen and the ghost file as you work. Just select the option to estimate a rectangular block. http://geoecosse.bizland.com/softwares Isobel ___________________________________________________________ Yahoo! Messenger - Communicate instantly..."Ping" your friends today! Download Messenger Now http://uk.messenger.yahoo.com/download/index.html -- * 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
