The term Geostatistics covers the analysis and modeling of spatial data that are distributed in a coordinate system of space and/or time. The theory of the regionalized variable, or Geostatistics, was born as an inference methodology to evaluate ore reserves and extended rapidly to other spatial observations where basic assumptions of classical statistics did not work. The three basic steps in a geostatistical study include: exploratory data analysis, structural analysis (calculation and modeling of variograms) and making predictions (kriging or simulations). This paper aims to provide a detailed introduction to the exploration and calculation of variograms using Variowin 2.21 software package. This packages is freely available from internet. Modeling of variograms is detailed in a another paper (Part II). This software Variowin is designed to make it easy for the novice to begin using g...

A fundamental step in all geostatistical study is the structural analysis that includes experimental variogram calculation and modeling. Modeling process consists on fitting a known theoretical model to the variogram in order to describe how the phenomenon under study behaves at those locations where it has not been sampled. In a previous paper (Part I) a detailed introduction to the exploration and calculation of variogram using Variowin 2.21 software package was provided. This paper aims to show, mainly, how to use the program Model of Variowin 2.21. Model allows fitting in an interactive way some theoretical models to experimental variogram obtained with program Vario2D. Variowin is a very good complement of other geostatistical programs which include modeling of experimental variogram.

Un paso fundamental en todo estudio geoestadístico es el análisis estructural que comprende el cálculo y modelado del variograma experimental. El proceso de modelación consiste en el ajuste al variograma de un modelo teórico conocido para describir el comportamiento del fenómeno bajo estudio en aquellas localizaciones donde no ha sido muestreado. En un trabajo previo (parte I) se realizó una introducción detallada sobre la exploración y cálculo de variogramas utilizando el software Variowin 2.21. El objetivo de este trabajo es exhibir principalmente como se utiliza el programa Model de Variowin 2.21. Model permite ajustar de manera interactiva algunos modelos teóricos al variograma experimental obtenido previamente con el programa Vario2D. Variowin resulta muy buen complemento de otros programas geoestadísticos que incluyen modelado del variograma.

The term Geostatistics covers the analysis and modeling of spatial data that are distributed in a coordinate system of space and/or time. The theory of the regionalized variable, or Geostatistics, was born as an inference methodology to evaluate ore reserves and extended rapidly to other spatial observations where basic assumptions of classical statistics did not work. The three basic steps in a geostatistical study include: exploratory data analysis, structural analysis (calculation and modeling of variograms) and making predictions (kriging or simulations). This paper aims to provide a detailed introduction to the exploration and calculation of variograms using Variowin 2.21 software package. This packages is freely available from internet. Modeling of variograms is detailed in a another paper (Part II). This software Variowin is designed to make it easy for the novice to begin using g...