📄 gslib help kb2d.htm
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<STRONG>Description:</STRONG>
<UL>
<LI>This is a straightforward 2-D simple and ordinary kriging subroutine
that can be used as is or as a basis for custom kriging programs. </LI></UL>
<DT><IMG height=14 alt=o src="GSLIB Help KB2D.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>icolx, icoly,</B> and <B>icolvr:</B> the columns for the <I>x</I> and
<I>y</I> coordinates, and the variable to be kriged.
<LI><B>tmin</B> and <B>tmax:</B> all values strictly less than <B>tmin</B>
and greater than or equal to <B>tmax</B> are ignored.
<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. If
there are suspected problems, or if you would like to see the actual kriging
matrices, level 2 or 3 can be chosen. It is advisable to restrict the actual
number of points being estimated when the debugging level is high (the
debugging file can become extremely large).
<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> and then <I>y</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>nxdis</B> and <B>nydis:</B> the number of discretization points for a
block. If both <B>nxdis</B> and <B>nydis</B> are set to 1 then point kriging
is performed.
<LI><B>ndmin</B> and <B>ndmax:</B> the minimum and maximum number of data
points to use for kriging a block.
<LI><B>radius:</B> the maximum isotropic search radius.
<LI><B>isk</B> and <B>skmean:</B> if <B>isk</B>0 then simple kriging will be
performed with a mean of <B>skmean</B>
<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; <B>cc</B>, the <I>c</I> parameter; <B>ang1</B>, the
azimuth of the maximum range; <B>aa_hmax</B>, the maximum range; and
<B>aa_hmin</B>, the minimum range. A detailed description of these
parameters is given in section II.3. </LI></UL></DT></DL><IMG height=8 alt=---
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