📄 gslib help vmodel.htm
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<HTML><HEAD><TITLE>GSLIB Help: VMODEL</TITLE>
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<H2>GSLIB Help Page: VMODEL</H2></CENTER>
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<STRONG>Description:</STRONG>
<UL>
<LI>This program will take the semivariogram model and write out a file with
the same format as the <TT>gam</TT> program so that it can be plotted with
<TT>vargplt</TT> The primary uses of <TT>vmodel</TT> are to overlay a model
on experimental points and also to provide a utility to check the definition
of the semivariogram model. </LI></UL>
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<STRONG>Parameters:</STRONG>
<UL>
<LI><B>outfl:</B> the output file that will contain the semivariogram
values.
<LI><B>ndir</B> and <B>nlag:</B> the number of directions and the number of
lags to be considered.
<LI><B>azm, dip</B> and <B>lag:</B> for each of the <B>ndir</B> directions a
direction must be specified by <B>azm</B> and <B>dip</B> and a unit lag
offset must be specified (<B>lag</B>).
<LI><B>nst</B> and <B>c0:</B> the number of structures and the nugget
effect.
<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,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.
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