AddAlpha                add alpha level to color that lacks one
ColorMap                Plot Levels of a Variable in a Colour-Coded Map
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
NumTiles                computes the necessary number of tiles from a
                        bounding box and a zoom level
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
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
columbus                Columbus OH spatial analysis data set
degreeAxis              axis with degrees
genStaticMap            generates a "static map" from map tiles by
                        "stitching" them together
geosphere_mercator      Transform longitude/latiude points to the
                        Mercator projection.
getGeoCode              geocoding utility
incidents               San Francisco crime data
mypolygon               simple wrapper function to plot colored
                        polygons
osmtile_bbox            compute the bounding box of an OpenStreetmap
                        tile
pennLC                  Pennsylvania Lung Cancer
plotOSM                 plots OSM map tiles
plotOSMtile             plots a single OSM tile
plotmap                 easy to use wrapper function
qbbox                   computes bounding box
sp_bbox                 computes bounding box
updateusr               Updates the 'usr' coordinates in the current
                        plot.
