Dear prof. Robert Hijmans,
I tryed your suggestion (under Vista), but got the following errors:
> gmap(a)
Loading required package: RgoogleMaps
Error in paste(googleurl, "center=", center, "&zoom=", zoom, "&size=", :
object 'localhostkey' not found
> sessionInfo()
R version 2.9.0 alpha (2009-03-26 r48224)
i386-pc-mingw32
locale:
LC_COLLATE=English_Canada.1252;LC_CTYPE=English_Canada.1252;LC_MONETARY=English_Canada.1252;LC_NUMERIC=C;LC_TIME=English_Canada.1252
attached base packages:
[1] stats graphics grDevices utils datasets methods base
other attached packages:
[1] maptools_0.7-20 foreign_0.8-34 sp_0.9-32 RgoogleMaps_1.1.6
fortunes_1.3-6
loaded via a namespace (and not attached):
[1] grid_2.9.0 lattice_0.17-20 tools_2.9.0
Any idea?
bests
milton
On Mon, Jan 18, 2010 at 2:06 AM, Robert J. Hijmans <r.hijm...@gmail.com>wrote:
> Patrick,
>
> I have had some success with plotting sp objects on top of G maps with
> this function
>
>
> gmap <- function(xy, maptype='terrain', ...) {
> require(RgoogleMaps)
> fun = points
> if (inherits(xy, 'Spatial')) {
> b = bbox(xy)
> if (inherits(xy, 'SpatialPoints')) {
> xy = coordinates(xy)
> } else {
> x = unlist(lapply(x...@polygons, function(i)slot(i,
> 'Polygons')))
> x = lapply(x, function(x)slot(x, 'coords'))
> xy = matrix(ncol=2, nr=0)
> for (i in 1:length(x)) xy = rbind(xy, x[[i]],
> c(NA,NA))
> fun = lines
> }
> } else {
> b = rbind(range(xy[,1], na.rm=TRUE), range(xy[,2],
> na.rm=TRUE))
> }
> mykey <- ### fill in your google maps API key for
> http://localhost/
> gm <- GetMap.bbox(key=localhostkey, lonR=b[1,], latR=b[2,],
> maptype=maptype)
> tmp <- PlotOnStaticMap(gm, lon=xy[,1], lat=xy[,2], FUN=fun, verbose=0,
> ... )
> }
>
>
> a = matrix(runif(100)*100-50, ncol=2)
> gmap(a)
>
> library(sp)
> gmap(SpatialPoints(a), col='red', cex=2, pch='+')
>
> library(maptools)
> data(wrld_simpl)
> hti = wrld_simpl[wrld_simpl$ISO3=='HTI',]
> gmap(hti, lwd=2, col='red')
>
>
> Hth,
> Robert
>
>
> On Sat, Jan 16, 2010 at 5:35 PM, Patrick Crutcher <pcrutc...@gmail.com>
> wrote:
> > I have some shapefiles I want to plot over Google Maps tiles. I have
> > polygons, lines and point data. What's the most efficient way to do this?
> > One path might be to use the pkg RgoogleMaps, however, it is still
> unclear
> > to me how to do this. I assume using PlotonStaticMap with some
> combination
> > of reformatting the shapefile data. Thanks.
> >
> > P.
> >
> > [[alternative HTML version deleted]]
> >
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> > R-sig-Geo@stat.math.ethz.ch
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> >
>
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