Hi Els, You should expect the directions of anisotropy to be fairly similar if the two attributes are reasonably correlated. Except if you use a linear model of coregionalization, there is no requirement for the directions of anisotropy or the anisotropy ratio to be the same. Pierre
Pierre Goovaerts Chief Scientist at Biomedware 516 North State Street Ann Arbor, MI 48104 Voice: (734) 913-1098 Fax: (734) 913-2201 http://home.comcast.net/~goovaerts/ -----Original Message----- From: Els Verfaillie [mailto:[EMAIL PROTECTED] Sent: Thu 2/17/2005 9:22 AM To: [email protected] Cc: Subject: [ai-geostats] multivariate geostats - anisotropy Hello, I have a dataset of 2 variables: grainsize of the sediment and a digital elevation model of the seafloor. I want to interpolate the grainsize using different multivariate geostatistical techniques like cokriging, kriging with external drift, colocated cokriging, simple kriging with varying local means to compare their results. I have a question about anisotropy: do the directions of anisotropy have to be exactly the same for the two variables? In fact, during my analysis, I have a lot of practical questions like this. Does anyone can advise me some good references about multivariate geostatistics and/or anisotropy? I already have the book of H. Wackernagel and some articles of P. Goovaerts. Especially, I would like to have some practical guidelines. Thanks in advance! Els ___________________________________________________ Els Verfaillie, PhD student Renard Centre of Marine Geology - Ghent University Krijgslaan 281-S8 B-9000 Gent - Belgium tel: +32-9-2644573 fax: +32-9-2644967 e-mail: [EMAIL PROTECTED] url: http://www.rcmg.ugent.be/ ___________________________________________________
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