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: Systematic grid sampling

2007-11-13 Thread Zhang, Chaosheng
Dear all, In geochemical investigations, it seems that there is a growing trend to use a systematic sampling scheme based on a predefined grid system. Here is the question: Does such a systematic grid sampling belong to probability sampling or not? I have got a comment on this topic:

AI-GEOSTATS: Summary: Systematic grid sampling

2007-11-19 Thread Zhang, Chaosheng
Dear All, Thanks for all the replies, based on which we can say that Systematic grid sampling does belong to probability sampling. There is a minor condition that the grid is laid down at random which appears to be a little bit controversial. Generally the grid is laid down based on the

AI-GEOSTATS: Call for abstracts: 2012 Sino-European Symposium on Environment and Health (SESEH 2012), Galway, Ireland, Aug 20-25, 2012

2011-11-01 Thread Zhang, Chaosheng
Dear Gregoire and all, Thanks for changing the rule! Just in time, the abstract submission for SESEH 2012 (http://www.nuigalway.ie/seseh2012 http://www.nuigalway.ie/seseh2012/ ) is open today. In SESEH 2012, there is a session “GIS and quantitative methods” which should be interesting

AI-GEOSTATS: REMINDER Call for Abstracts: ISEH 2016, ISEG 2016 & Geoinformatics 2016 on Environment, Health, GIS and Agriculture, Galway, Ireland, August 14 – 20, 2016

2016-02-06 Thread Zhang, Chaosheng
, China Geoinformatics 2016 Program and Steering Committee Hu, Shixiong, East Stroudsburg University (Chair, Program) Zhang, Chaosheng, National University of Ireland, Galway (Chair, Conference) Alcorn, Trevor, Marine Institute, Ireland An, Li, San Diego State University, USA Bai, Yuqi, Tsinghua U

AI-GEOSTATS: Call for abstracts/papers: Geoinformatics 2016, Galway, Ireland, Aug. 14-20, 2016

2016-01-26 Thread Zhang, Chaosheng
Apologies for cross-postings ISEH 2016, ISEG 2016 & Geoinformatics 2016 Joint International Conference on Environment, Health, GIS and Agriculture ISEH 2016: The 3rd International Symposium on Environment and Health ISEG 2016: The 10th International Symposium on Environmental Geochemistry