Select isolines from the Modules pull down menu. We use a Surface Offset of 0.0 by default for a reasons explained below.
One frequently adjusted parameter for isolines is the # of Isolines slider. This option allows us to change the density of lines depending on the distribution of the attribute. The number of isolines slider is interpreted two different ways depending on whether or not the log10 check box is selected. If the log10 check box is selected, the number of isolines refers to the number of isolines per decade. The logarithmic option allows for non-integer data limits. The default number of lines is three and the maximum (for log option) is three. Isolines are placed on specific intervals within each decade. It will create isolines at suitable intervals dependent on number of isolines selected.
1 will give even decades.
2 will give lines at 1, 3, 10, 30, etc.
3 will give lines at 1, 2, 5, 10, 20, 50, etc.
If the log10 check box is not selected, then the number of isolines refers to the total number of isolines to be drawn on the surface. The default is three and the maximum allowable is 100. isolines are placed at equal intervals based on (max-min)/number of isolines.
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