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

[Roland Kaiser]

Hi Patrik,

like Tom suggested you may also want to download google maps tiles
directly, mosaic them and warp to your desired projection.

Tom's code getStaticGoogleMaps.R is a great thing!
However, I can't run it on Mac OSX, because I failed to
compile SAGA GIS. Instead developed code that calls GDAL programs.

If you work on Mac OSX or another UNIX system
you may try the script temporally here:

http://www.users.sbg.ac.at/~9722152/fetchGE/fetchGE.zip

Documentation is in file FetchGE.R
You need to install GDAL, python and wget, as well as library(rgdal).

Best wishes,

Roland

>
> 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:
>
> http://spatial-analyst.net/book/getStaticGoogleMaps.R
>
> T. Hengl
> http://home.medewerker.uva.nl/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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