ETL 1110-1-175
30 Jun 97
c. The geostatistical environmental assess-
published by the Association of Groundwater
Scientists and Engineers, contain articles describ-
ment software know as GEO-EAS (Englund and
ing special applications of kriging techniques in the
Sparks 1991) also is an interactive, menu-driven
environmental arena. Water Resources Research
kriging software package for performing two-
tends to contain articles that are highly theoretical.
dimensional kriging. It has no direct provisions for
Other journals that may contain information
universal kriging (Table 3-1). GEO-EAS does
addressing geostatistics are the Journal of Envi-
have an advantage over STATPAC in its enhanced
ronmental Engineering, published by the Ameri-
graphics capabilities, which are useful in the inter-
can Society of Civil Engineers; Stochastic
active fitting of theoretical variograms to sample
variogram points. In addition, in the computation
International, and the North American Council on
of the sample variogram points, GEO-EAS allows
Geostatistics, published by the Colorado School of
for variable bin sizes, the use of which will be fur-
Mines.
ther discussed in Chapter 4.
d. STATPAC and GEO-EAS were originally
3-3. Software
developed for the personal computer. Since then,
versions of GEO-EAS have been developed for
a. The geostatistics software described in this
some types of work stations. The kriging routines
section is limited to a few readily available public
in STATPAC have not been adapted to work
domain packages that are executable at least on the
stations.
DOS and sometimes on the UNIX platforms.
e. A third software package, the geostatistical
There are several commercial packages that are
being marketed, but these will not be reviewed in
software library known as GSLIB (Deutsch and
this ETL. It is beyond the scope of this ETL to
Journel 1992), is a suite of programs developed
acquire and evaluate commercial packages; how-
over the years at Stanford University, Stanford,
ever, a matrix-like table (Table 3-1) has been
CA. It is presented as a collection of routines that
included. The table addresses each of the software
are machine-independent (Table 3-1) and are
packages described in this ETL and also may serve
intended to be used as a modular concept. The
as a reference guide to other software packages.
package is distributed as a suite of FORTRAN
source codes that need to be compiled. Use of
b. Some of the earliest interactive kriging
GSLIB requires a relatively high level of familiar-
software offered as a package was developed by
ity with geostatistics for its efficient use. As in the
Grundy and Miesch (1987). Overall, this general
previous two software packages, GSLIB handles
statistics package (STATPAC) contains a series of
variogram analysis and kriging techniques
programs that can handle two-dimensional kriging,
(Table 3-1). Two of its primary advantages over
including universal kriging. The package has
the other two packages are its simulation tech-
capabilities for data transformations, variogram
niques and ability to analyze three-dimensional
analyses, cross-validation, and univariate statistics
data sets. Such techniques are useful especially in
(Table 3-1). Graphics in the package are limited
estimating potential extreme outcomes in a geosta-
to simple line-printer plots of the sample vario-
tistical analysis.
gram points and data maps. The menu-driven
package includes a tutorial using all of the kriging
routines. The package is distributed with not all,
Modeling System (GMS) is a fourth software
but most source codes and, therefore, can be
package that has kriging capabilities. GMS is a
modified by the user if desired. All two-
windows-based integrated modeling environment
dimensional kriging routines can be executed from
for site characterization, groundwater flow and
the command line, which provides users with the
transport modeling, and visualization of results.
opportunity for batch processing.
The GSLIB software has been implemented within
3-2
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