Serves two purposes: (i) Provide a comfortable R interface to query the Google server for static maps, and (ii) Use the map as a background image to overlay plots within R. This requires proper coordinate scaling.
Changes in Version 1.2.0.3
o Added full support for Openstreetmap (OSM) tiles All functions should work properly with both Google and OSM tiles.
Changes in Version 1.2.0.2
o Added function ColorMap, which plots levels of a Variable in a Colour-Coded Map
Changes in Version 1.2.0
o As of version: 1.2.0, RgoogleMaps only offers support for png files, no more jpeg. The maintenance of the jpg ReadImages library has become too tedious, so I removed all dependencies.
Changes in Version 1.3.0
o bug fix: NEWMAP had no effect in GetMap function, fixed now o bug fix: spatial polygons with holes were not displaced properly, fixed now o bug fix: boundary condition problems at lon= +/- 180, fixed now o bug fix: dataframe markers argument to GetMap did not work properly, fixed now o new feature: added full support for Microsoft bing map tiles
Changes in Version 1.4.1
o new feature: added full support for OpenStreetMap maps o removed dependency on RJSONIO o new feature: added functions to fetch individual map tiles and stitch them together. This has the side effect of making these maps available offline