AddAlpha                add alpha level to color that lacks one
ColorMap                Plot Levels of a Variable in a Colour-Coded Map
DF2SpatialPointsDataFrame
                        change data.frame to SpatialPointsDataFrame
GetBingMap              download a static map from the Microsoft map
                        tile server
GetMap                  download a static map from the Google server
GetMap.bbox             GetMap bbox
GetMapTiles             download map tiles from specified map tile
                        servers such as openstreetmap or Google
GetOsmMap               Query the Open Street Map server for map tiles
                        instead of Google Maps
IdentifyPoints          identify points by clicking on map
LatLon2XY               computes the coordinate transformation from
                        lat/lon to map tile coordinates
LatLon2XY.centered      computes the centered coordinate transformation
                        from lat/lon to map tile coordinates
MapBackground           get static Map from the Google server
MaxZoom                 computes the maximum zoom level which will
                        contain the given lat/lon range
NYleukemia              Upstate New York Leukemia Data
PlotArrowsOnStaticMap   plots arrows or segments on map
PlotOnMapTiles          plots on map tiles by "stitching" them together
PlotOnStaticMap         overlays plot on background image of map tile
PlotPolysOnStaticMap    plots polygons on map
RGB2GRAY                translates an RGB image matrix to gray scale
ReadMapTile             Read a bitmap image stored in the PNG format
RgoogleMaps-package     Overlays on Google map tiles in R
SpatialToPBS            converts spatial objects as defined in package
                        sp to simpler PBSmapping type dataframes
TextOnStaticMap         plots text on map
Tile2R                  simple utility to offset and scale XY
                        coordinates with respect to the center
XY2LatLon               computes the centered coordinate transformation
                        from lat/lon to map tile coordinates
bubbleMap               Create a bubble plot of spatial data on Google
                        Maps
columbus                Columbus OH spatial analysis data set
degreeAxis              axis with degrees
getGeoCode              geocoding utility
incidents               San Francisco crime data
mypolygon               simple wrapper function to plot colored
                        polygons
pennLC                  Pennsylvania Lung Cancer
plotmap                 easy to use wrapper function
qbbox                   computes bounding box
updateusr               Updates the 'usr' coordinates in the current
                        plot.
