Paul,
> It could be useful to have a contour line style that has cross-ticks
> pointing up or down the local field gradient, i.e.:
>
> -| |-
> low values -| middle values |- high values
> -| |-
>
> Such a line style could be used to indicate intersections with the
> ground, or to outline regions of missing values, or to simplify plots
> where you only want to draw a few contour lines.
CONPACK has a "hachuring" capability. I don't know how much of this
is accessible from NCL or if it can be used in quite the way that you
wish, but the basic logic is there in the underlying code ...
Dave Kennison
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