📄 gslib help cokb3d.htm
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<H2>GSLIB Help Page: COKB3D</H2></CENTER>
<DL>
<DT><IMG height=14 alt=o src="GSLIB Help COKB3D.files/ball.red.gif" width=14>
<STRONG>Description:</STRONG>
<UL>
<LI>A cokriging program for a points or blocks on a regular grid. </LI></UL>
<DT><IMG height=14 alt=o src="GSLIB Help COKB3D.files/ball.red.gif" width=14>
<STRONG>Parameters:</STRONG>
<UL>
<LI><B>datafl:</B> the input data in a simplified Geo-EAS formatted file.
<LI><B>nvar:</B> the number of variables (primary plus all secondary). For
example, <B>nvar=2</B> if there is only one secondary variable.
<LI><B>icolx, icoly, icolz</B> and <B>icolvr():</B> the columns for the
<I>x, y</I> and <I>z</I> coordinates, the primary variable to be kriged, and
all secondary variables.
<LI><B>tmin</B> and <B>tmax:</B> all values (for all variables) strictly
less than <B>tmin</B> and greater than or equal to <B>tmax</B> are ignored.
<LI><B>coloc:</B> set to 1 if performing co-located cokriging with a gridded
secondary variable, otherwise set to 0.
<LI><B>secfl:</B> if co-located cokriging, the file with the gridded
secondary variable.
<LI><B>icolsec:</B> if co-located cokriging, the column number for the
secondary variable in <B>secfl</B>
<LI><B>idbg:</B> an integer debugging level between 0 and 3. The higher the
debugging level the more output. Normally level 0 or 1 should be chosen.
<LI><B>dbgfl:</B> the debugging output is written to this file.
<LI><B>outfl:</B> the output grid is written to this file. The output file
will contain both the kriging estimate and the kriging variance for all
points/blocks. The output grid cycles fastest on <I>x</I> then <I>y</I> then
<I>z</I>
<LI><B>nx, xmn, xsiz:</B> definition of the grid system (<I>x</I> axis).
<LI><B>ny, ymn, ysiz:</B> definition of the grid system (<I>y</I> axis).
<LI><B>nz, zmn, zsiz:</B> definition of the grid system (<I>z</I> axis).
<LI><B>nxdis, nydis</B> and <B>nzdis:</B> the number of discretization
points for a block. If <B>nxdis, nydis</B> and <B>nzdis</B> are set to 1
then point cokriging is performed.
<LI><B>ndmin, ndmaxp</B> and <B>ndmaxs:</B> the minimum and maximum number
of primary data, and the maximum number of secondary data (regardless of
which secondary variable) to use for kriging a block.
<LI>search radii for primary data
<LI>search radii for secondary data (same for all types)
<LI>the angles defining the common orientation of the search ellipsoids for
primary and secondary data
<LI><B>ktype:</B> the kriging type must be specified: 0 = simple cokriging,
1 = standardized ordinary cokriging with re-centered variables and a single
unbiasedness constraint; 2 = traditional ordinary cokriging.
<LI><B>mean():</B> the mean of the primary and all secondary variables are
required input if either simple cokriging or standardized ordinary cokriging
are used. The program calculates the data residuals from these means.
</LI></UL>The direct and cross variograms may be specified in any order; they
are specified according to the variable <B>number</B> Variable ``1'' is the
primary (regardless of its column ordering in the input data files) and the
secondary variables are numbered from ``2'' depending on their ordered
specification in <B>icolvr()</B> It is unnecessary to specify the <I>j</I> to
<I>i</I> cross variogram if the <I>i</I> to <I>j</I> cross variogram has been
specified; the cross variogram is expected to be symmetric (as from theory).
For each <I>i</I> to <I>j</I> variogram the following are required:
<UL>
<LI><B>nst</B> and <B>c0:</B> the number of variogram structures and the
isotropic nugget constant. The nugget constant does not count as a
structure.
<LI>For each of the <B>nst</B> nested structures one must define <B>it</B>
the type of structure (the power model is not allowed); <B>cc</B> the
<I>c</I> parameter; <B>ang1,ang2,ang3</B> the angles defining the geometric
anisotropy; <B>aa_hmax</B>, the maximum horizontal range; <B>aa_hmin</B>,
the minimum horizontal range; and <B>aa_vert</B>, the vertical range.
</LI></UL>
<DT><IMG height=14 alt=o src="GSLIB Help COKB3D.files/ball.red.gif" width=14>
<STRONG>Application notes:</STRONG>
<UL>
<LI>The construction of the cokriging matrix requires the linear model of
coregionalization. The input variogram parameters are checked for positive
definiteness. The power model is not allowed.
<LI>A specific search is done for secondary data (same for all secondary)
allowing the option of collocated cokriging.
<LI>A cokriging program for scattered points and cross validation is not
provided; programs <TT>cokb3d</TT> and <TT>kt3d</TT> could be combined for
this purpose. </LI></UL></DT></DL><IMG height=8 alt=---
src="GSLIB Help COKB3D.files/line.blue.gif" width=652>
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