Install spatial datasets found at url into the directory
previously set with setSpatialDataDir().
If pattern = NULL (default), available datasets will be displalyed..
installSpatialData(
dataset = NULL,
urlBase = "http://data.mazamascience.com/MazamaSpatialUtils/Spatial_0.8"
)Name of spatial dataset to install.
Location of spatial data files.
If pattern = NULL a vector of dataset names.