Dear Jason, I saw few replies to your question and I can imagine you are a bit lost with these technical terms that are not documented in Arc/Info's manual. Versions younger than Arc/Info 8.0 (which has a brand new geostatistical module) are almost useless for what concerns geostatistics. More than the estimation algorithm (ordinary kriging, universal kriging, etc.), it is the analysis and the modelisation of the spatial correlation which is essential. Since you can't properly make a decent semivariogram analysis and since the fitting of the semivariogram is automatic (almost any geostatistician will tell you to fit your model manually or at least to have a full control on the parameters you select) in Arc/Info 7, you can almost forget it ! Three years ago I developed in AML an interface between UNCERT (see my AI-GEOSTATS web pages for more info) and Arc/Info 7.0. There is unfortunately nothing left from the code since I left the place where I developed it but I'm sure many people on the list did something similar (with UNCERT, Gstat, GSLIB or the UNIX version of GeoEas for exemple). I'm sorry for the bad news but making a spatial interpolation, especially when you plan to use geostatistical methods, requires some experience from the users (and this is a radiobiologist that is talking, not a statistician) Hope this helps a bit, Gregoire PS: may I suggest you to download Geoeas (+ manual) and play around with the semivariograms to better realise how limited the functions are in Arc/Info 7. Jason Sawle <[EMAIL PROTECTED]> wrote: > Hello > > This is my first time on the list and I hope this question is going to > the right place. My appologies if not. > > I am using Arc/Info 7.2.1 on an NT workstation. > With GRID I am using linear universal kriging to produce maps of heavy > metal concentration from 127 sample points. > > Could anyone tell me what c0 and b mean. These appear at the start of > the interpolation proceedure. I have values of 0 and 11580.591 > respectively and I am unsure of what they imply about this method. > > Thanks for your time with this. > > Jason Sawle > > ############################################################### > Department of Geography > Canterbury Christ Church University College > North Holmes Road, > Canterbury, Tel: 01227 782337 > Kent, Fax: 01227 767531 > CT1 1QU, email: [EMAIL PROTECTED] > United Kingdom http://www.cant.ac.uk > > > -- > * 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 Gregoire Dubois Institute of Mineralogy and Petrography Dept. of Earth Sciences University of Lausanne Switzerland http://www.ai-geostats.org ____________________________________________________________________ Get free email and a permanent address at http://www.netaddress.com/?N=1 -- * 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
