[R-sig-Geo] image background for spplot of gridded data

[Oscar Perpiñan]

Hi,

For the sake of completeness: just a few days ago I received a comment
to a post about spplot and ggmap
(http://procomun.wordpress.com/2013/04/24/stamen-maps-with-spplot/).
There I was using a SpatialPointsDataFrame object. Because of that
comment I posted another example with SpatialPolygonsDataFrame:
https://gist.github.com/oscarperpinan/7482848

Best,

Oscar.
-----------------------------------------------------------------
Oscar Perpiñán Lamigueiro
Grupo de Sistemas Fotovoltaicos (IES-UPM)
Dpto. Ingeniería Eléctrica (ETSIDI-UPM)
URL: http://oscarperpinan.github.io
Twitter: @oscarperpinan


2013/11/20 Waichler, Scott R <Scott.Waichler at pnnl.gov>:
> I was told, among other things, to look for previous messages by Oscar that would explain how to do this.  Here is Oscar's solution that I found to work for the case where you want to plot two rasters that have different extents.  In my case, gmap is a satellite image obtained with RgoogleMaps, and z are the results I want to plot over the background image.  I made the alpha values of z less than 1 so that the background image would show through.
>
> library(rasterVis)
> levelplot(z~x*y) +
> layer_(grid.raster(gmap, y=latCenter, width=width, height=height, default.units='native'))
>
> Scott Waichler
>
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