Author(s)

J. Negreiros, M. Painho, M. Aguilar & F. Aguilar

Abstract

SAKWeb© (Spatial Autocorrelation and Kriging Web) is the first Internet geosoftware that provides access to a wider audience to boost geostatistical knowledge in conjunction with new tools. The enhancement of a global confidence uncertainty measure, based on the rescaled Ordinary Kriging (OK) variance of Isaaks and Srivastava (An Introduction to Applied Geostatistics. Oxford University Press, New York, 1989.), is the core of this paper. Hence, OK variance, variography, declustering methods and nearest neighbourhood analysis are reviewed in this paper. In addition, a detailed analysis regarding Geographical Information Systems (GISs) software implementation is presented, as well as SAKWeb© overall functionalities. It is expected that this accomplishment might be used by geostaticians with risk assessment troubles to layout a first raw global confidence plume after any Kriging surface interpolation. Keywords: geographical information systems, spatial interpolation, Kriging, uncertainty, risk analysis, clean cost assessment. 1 Preamble 1.1 Implementation strategies for spatial analysis At present, one software implementation solution is to relate the GIS to existing statistical packages, such as SAS-GIS®, SPSS-X®, Glim®, Systat® or Minitab®. The difficulty involved in this question is that statistical packages do not provide

Keywords

geographical information systems, spatial interpolation, Kriging, uncertainty, risk analysis, clean cost assessment