[R-sig-Geo] Plotting shapefiles on top of Google map tiles

Tomislav Hengl hengl at spatial-analyst.net
Mon Jan 18 09:52:12 CET 2010

Hi Patrick,

I was breaking my head with this problem for one afternoon. Being more
a GIS person, my ideas was that one should be able to get a
StaticGoogleMaps image to some GIS format, i.e. to convert it to a
SpatialGridDataFrame. Then it is rather easy to overlay
points/lines/polygons using the spplot function (or to export to some
external GIS format e.g. geotiff). The procedure is now explained on
p.103-105 in my book (http://spatial-analyst.net/book/DataSources).
Here is the complete code:


T. Hengl

Quoting Patrick Crutcher <pcrutcher at gmail.com>:

> 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.
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