[R-sig-Geo] Stippling

[Tom Gottfried]

create a regular grid, subset it with over() and plot it with the sp.layout argument of spplot().

HTH,
Tom

Am 05.12.2011 16:36, schrieb ElenaC:
> Dear all,
>
> is there a simple way to add stippling to a map? I have my data as a
> SpatialGrid data frame, with a column for a prediction value and another for
> its standard deviation. I create color maps from the prediction, and would
> like to indicate which areas of the map are statistically significant
> (prediction is greater than the standard deviation) by plotting regular dots
> on top, similar to what they do in the plots b and d of the figure:
> http://www.ipcc.ch/graphics/ar4-wg1/jpg/fig-10-18.jpg
>
> Id appreciate any suggestion!
>
> Best regards,
> Elena
>
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