[R-sig-Geo] spplot grid data - scale colours customizing

[Edzer Pebesma]

On 08/03/2015 09:41 AM, pierluigi de rosa wrote:
> Dear All,
> 
> I'm trying to understand how spplot work with colour managing with gridded
> data.
> 
> I have na Object of class SpatialGridDataFrame
> Coordinates:
>       min     max
> x 2267600 2325600
> y 4693800 4826200
> Is projected: TRUE
> proj4string :
> 
> with 12 data for column attribute
> 
> I'm able to plot the SpatialGridDataFrame with:
> 
> spplot(fogli_Sup_Pioggia,as.table=TRUE, col.regions = cm.colors(100) ,
> key.space = "right")
> 
> but I want to select where change in colour appears and not leave spplot to
> do it by it self.
> I tried passing cuts option in this way:
> 
> spplot(fogli_Sup_Pioggia,as.table=TRUE, col.regions = cm.colors(100) ,
> cuts=c(1,2.5,3),key.space = "right")
> 
> It seems working but now the colour is not graduated any more but.
> How can I have a graduated palette again?
> Thanks
> 

this gave you a warning, which you didn't report.

Use cuts=5 to get 5 classes; use at=c(1,2.5,3) to get colour changes at
these values. And do read ?spplot.

-- 
Edzer Pebesma
Institute for Geoinformatics (ifgi),  University of Münster,
Heisenbergstraße 2, 48149 Münster, Germany; +49 251 83 33081
Journal of Statistical Software:   http://www.jstatsoft.org/
Computers & Geosciences:   http://elsevier.com/locate/cageo/
Spatial Statistics Society http://www.spatialstatistics.info

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