[R-sig-Geo] sp and latticeExtra: add colorbar for layer drawn 'under'
btupper at bigelow.org
Wed Sep 2 15:07:17 CEST 2015
On Aug 30, 2015, at 6:37 AM, Edzer Pebesma <edzer.pebesma at uni-muenster.de> wrote:
> On 08/29/2015 10:55 AM, Tim Appelhans wrote:
>> I am not sure why SpatialPolygons* objects get rendered via levelplot.
> because levelplot has the understanding of plotting something in 2D,
> using colours according to the continuous variation of a third variable.
Thanks to you and Tim for the clarifications.
I can see in the source code, spplot.R, that SpatialPolygonsDataFrame and SpatialLinesDataFrame are handled by levelplot; thanks for pointing that out. That SpatialPointsDataFrame is handled by xyplot gives me pause now. In fact, if I think about it it confuses me, so I best not think about that first thing in the morning!
I agree with Tim that starting with the raster first and then adding the polygons with latticeExtra::as.layer() is more intuitive.
> Edzer Pebesma
> Institute for Geoinformatics (ifgi), University of Münster,
> Heisenbergstraße 2, 48149 Münster, Germany; +49 251 83 33081
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