[ai-geostats] 3-D kriging with 'walls'

[Li, Xiong]

Dear Listers,   Two months ago, Kathryn Smith posted a question about 2-D kriging with "walls". I am wondering if there is a program (either in the public domain or in a commercial software) that does 3-D kriging with "walls". In this case, the fault or shoreline or water bottom is a surface, not a line. I know the principle of doing it, e.g., explained in William Harper's reply to Kathryn, but want a program to do it.   Thank you for your help.   Xiong Li -------------------------------------------------------------- Xiong Li Fugro Robertson Inc. 6100 Hillcroft Avenue Houston, Texas 77081-1009, USA --------------------------------------------------------------   -----Original Message----- From: Harper, William V [mailto:[EMAIL PROTECTED] Sent: Thursday, June 23, 2005 8:43 AM To: Kathryn E.L. Smith; ai-geostats@unil.ch Subject: RE: [ai-geostats] kriging with 'walls' Kathryn,   We (Isobel Clark and moi) have been dealing with such for some time - especially faults.  You specify the location of the fault or shoreline and the software will not consider pairs of points in the development of the semi-variogram that are located on opposing sides of this boundary.  Likewise it is properly handled in the subsequent kriging.  But 1st it is important to model the spatial variability structure properly prior to the subsequent estimation (kriging).  See http://geoecosse.bizland.com/softwares/ for demos to examine.  I hope this helps.   Best,   Bill   -- William V Harper, Mathematical Sciences Otterbein College, Towers Hall 139, 1 Otterbein College Westerville OH 43081-2006  USA Office phone: 614-823-1417     Office Fax 614-823-3201 Faculty page: http://www.otterbein.edu/home/fac/WLLVHRPR For the best in geostatistics: http://geoecosse.hypermart.net/     From: Kathryn E.L. Smith [mailto:[EMAIL PROTECTED] Sent: Thursday, June 23, 2005 9:31 AM To: ai-geostats@unil.ch Subject: [ai-geostats] kriging with 'walls'   Hello, Does anyone know of a program that does kriging, but allows for 'walls' such as a shoreline or faults? ie. data points on one side of the 'wall' will not influence what is interpolated from data on the other side. I've checked into ESRI and Surfer, neither will allow you to have 'faults' or 'walls' with their kriging program. Thanks for your input! kathryn

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