Further reading

For maps, refer to the following resources:

• Function borders(): http://docs.ggplot2.org/current/borders.html

• Function coord_map(): http://docs.ggplot2.org/current/coord_map.html

• Help page of the function mapproject(): ?mapproject

• Help page of the function map_data(): http://docs.ggplot2.org/current/map_data.html

• ggmap: Spatial Visualization with ggplot2, The R Journal Vol. 5/1, D. Kahle and H. Wickham

For GGally, refer to the following resources:

• Help page of the function ggpairs(): ?ggpairs

For Heatmaps, refer to the following resources:

• Help page of the function geom_tile(): http://docs.ggplot2.org/current/geom_tile.html