I really don know why you have problems with the model. It is valid for kriging but it is not valid for Sequential Gaussian Simulation. The problems with kt3d, if you pretend to do kriging with trend or drift, can be related to the shape of the data and drift. If data position is linear combination of the drif the kriging system dont have trivial solution. In the case of linear drift the estimation can be unstable if data position is close to a strike line!
Notice that if you are using UK you have to get the variogram of residuals! It can be suspicious in some cases, then it is preferable to use IRF-K approach. Dr. Adrian Martínez Vargas Departamento de Geología ISMM, Las Coloradas s/n Moa, Holguín Cuba CP 83329 -----Original Message----- From: sebastiano trevisani <[EMAIL PROTECTED]> To: [email protected] Date: Mon, 28 May 2007 13:04:01 +0200 Subject: AI-GEOSTATS: nugget effect plus linear model Gslib > Dear list member > > I was working with gslib library and I had some troubles in trying to > interpolate with a linear variogram > (well, a power model with exponent = 1) and a nugget effect. In > particular both vmodel.exe as well as kt3d.exe don't > care about the value of the nugget effect imposed. > So I'm wondering If anyone has experienced something similar. > Then, I have another question: have you any idea in which I can change > gslib > code in order to perform factorial kriging? > Sebastiano T. > > + > + To post a message to the list, send it to [email protected] > + To unsubscribe, send email to majordomo@ jrc.it with no subject and > "unsubscribe ai-geostats" in the message body. DO NOT SEND > Subscribe/Unsubscribe requests to the list > + As a general service to list users, please remember to post a summary > of any useful responses to your questions. > + Support to the forum can be found at http://www.ai-geostats.org/
