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

[Agustin Lobo]

Yes, it does for me as well: I had messed with the parameters of the
map in the original function.
Here I've made a page showing what I do and what I get:
https://dl.dropboxusercontent.com/u/3180464/contourOngmap_log.html

Is it possible doing the reverse, overlaying the contour on top of the
map instead of putting the map under the contour?
I need the plume in the context of the country.

Agus


Agus

On Tue, Dec 10, 2013 at 11:51 AM, Oscar Perpiñan
<oscar.perpinan at gmail.com> wrote:
> It works for me using rinvmod2lonlat (long-lat coordinates).
>
> Oscar.
> -----------------------------------------------------------------
> Oscar Perpiñán Lamigueiro
> Grupo de Sistemas Fotovoltaicos (IES-UPM)
> Dpto. Ingeniería Eléctrica (ETSIDI-UPM)
> URL: http://oscarperpinan.github.io
> Twitter: @oscarperpinan
>
>
> 2013/12/10 Agustin Lobo <alobolistas at gmail.com>:
>> and would it possible a similar plot using contourplot() (or
>> levelplot()) overlaid
>> on a gmap?
>>
>> I've tried the equivalent to the
>> stamen.R function that you refer to:
>>
>> contourplot(rinvmod2goog,zscaleLog=TRUE,
>>             at=my.at,colorkey=myColorkey,margin=FALSE,add=TRUE) +
>>   layer(grid.raster(gmap2,
>>                     x=lonCenter2, y=latCenter2,
>>                     width=width2, height=height2,
>>                     default.units='native'),under=TRUE)
>>
>> and get no error but just the contour. I've tried with my object in
>> pseudomercator and "lon-lat" geographic coordinates:
>> rinvmod2goog <- projectRaster(from=rinvmod2, crs=CRS("+init=epsg:3857"))
>> rinvmod2lonlat <- projectRaster(from=rinvmod2, crs=CRS("+proj=longlat
>> +ellps=WGS84 +no_defs"))
>>
>> both rinvmod2 and and gmap2 display fine independently.
>>
>> Data:
>> https://dl.dropboxusercontent.com/u/3180464/rinvmod2.rda
>> https://dl.dropboxusercontent.com/u/3180464/gmap2.rda
>> (to be used with load())
>>
>> Thanks
>>
>> Agus
>>
>> On Wed, Nov 20, 2013 at 6:47 PM, Oscar Perpiñan
>> <oscar.perpinan at gmail.com> wrote:
>>> 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
>>>>
>>>> _______________________________________________
>>>> R-sig-Geo mailing list
>>>> R-sig-Geo at r-project.org
>>>> https://stat.ethz.ch/mailman/listinfo/r-sig-geo
>>>
>>> _______________________________________________
>>> R-sig-Geo mailing list
>>> R-sig-Geo at r-project.org
>>> https://stat.ethz.ch/mailman/listinfo/r-sig-geo
>
> _______________________________________________
> R-sig-Geo mailing list
> R-sig-Geo at r-project.org
> https://stat.ethz.ch/mailman/listinfo/r-sig-geo