http://www.cgd.ucar.edu/csm/support/CSM_Graphics/coneff.shtml
look at examples: 7, 8, 10 [especially], and 11
D
======
>
>NCL provides access to the Conpack hachuring control parameters via
>the cnConpackParams resource. See
>
>http://ngwww.ucar.edu/ngdoc/ng/ref/hlu/obj/ContourPlot.res.html#cnConpackParams
>
> -dave
>
>
>On Fri, 3 Oct 2003, Dave Kennison wrote:
>
>> 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 ...
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