Geostatistics Procedures Sequence

This page presents the necessary steps for the manipulation of geostatistics module at SPRING. The figure below shows the sequence to be executed to generate the numerical models from the geostatistics modeling.

The Geostatistics Procedures Module has as objective a two dimensional (2D) analysis, for spatial distributed data, with respect to the interpolation of surfaces generated from georeferenced samples. Therefore, the input of the data in this module is made by a numerical model Information Layer (IL) with spot heights. This IL can be generated by importing other formats, edited or even converted by the sample points generating tool.

The geostatistics modeling output generates another IL, also from the numerical model, but with a rectangular grid representation, with a resolution defined by the user. Later, this IL can be converted to images or any other product (see DTM products).

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About the GSLIB Geostatistics Library

NOTE: As the SPRING geostatistics module was built based on the GSLIB, some comments about this library are given below.

The GSLIB library was built by Deutsch and Journel (1992), from programs developed and used at Stanford University over twelve years. These programs are constantly reviewed and modified, to manILulate new algorithms. The programs included in GSLIB are support tools for the development of personal programs as well as advanced research applications. Public domain geostatistics programs, such as Geo-EAS (Englund and Sparks, 1988), Geostatistical Toolbox Primer (Froidevaux, 1990), ISIM3D (Hernández and Srivastava, 1990), among others, were developed from this library.

The GSLIB library is not a commercial product; therefore, there is no guarantee or technical support, but a reasonable effort has been made for maintaining it without errors and well documented. Its source code is written in Fortran 77 programming language, ANSI standard (American National Standard Institute). The ANSI standard allows machine portability, that is, the GSLIB can be executed on several platforms, from personal computers to workstations.

Detailed descriptions about the algorithms, programming conventions and file formats are found in Deutsch and Journel (1992).

The GSLIB structure is basically composed by four modules:

  • utilities module: composed by functions that allow to show and to analyze results;
  • variogram module: composed by four functions that generate variograms from regular or irregular spaced samples;

  • kriging module: composed by functions that execute interpolation based on kriging techniques, such as simple kriging, ordinary kriging, co-kriging and others;
  • simulation module: composed by functions that execute stochastic simulations.

See also:

See also:
Spatial Analysis
Digital Terrain Modeling
Digitalization of Maps