install.packages("maptools")       # Package of tools for reading and handling spatial objects
install.packages("rgdal")          # Package for bindings for the Geospatial Data Abstraction Library
install.packages("raster")         # Package for geographic data analysis and modeling
install.packages("rgeos")          # Interface to Geometry Engine - Open Source (GEOS)
install.packages("rasterVis")      # Package for visualization methods for raster data
install.packages("RCurl")          # Provides functions to allow one to compose general HTTP requests and to fetch URIs
install.packages("devtools")       # Package tools to make Developing R Packages easier