RE: AI-GEOSTATS: Re: Kriging using Nugget Model

2007-01-03 Thread Zhang, Chaosheng
Dear all, Happy New Year! Can we regard n=1 in the case of point kriging? I think there is a trap in the question: How good is estimation using kriging system that uses a nugget model? My understanding is that when the spatial autocorrelation of a variable behaves like a nugget effect, any

AI-GEOSTATS: Re: Kriging using Nugget Model

2007-01-03 Thread Isobel Clark
Mehari SURFER will be giving you the arithmetic mean of the samples which fall inside your search radius, not all possible samples. Effectively, you are getting a moving average. Isobel http://www.kriging.com

AI-GEOSTATS: Re: Kriging using Nugget Model

2007-01-03 Thread bob sandefur
Before I Kriged with a pure nugget variogram I would ask: 1. How many data points? 2. Do you expect the data to be spatially uncorrelated? (i.e. whatÂ’s that variable?) 3. If you transform distribution to approximate normal is variogram still pure nugget? 4. Does regression