title: how to convert RgoogleMaps PNG to SpatialGridDataFrame in R?
body: <p>I have derived a 'static map' using the GetMap() function from the RgoogleMaps package. I can save it (MyMap) to my harddrive as a PNG. However, then it looses the spatial reference. </p>
  
  <p>Has anybody succeeded in creating a spatial object (in the sense of a GDAL-readable data format) from such a PNG? </p>