References

Keim, Daniel A. 2002. “Information Visualization and Visual Data Mining.” IEEE Transactions on Visualization and Computer Graphics 8 (1): 1–8.

Pebesma, Edzer. 2018. “Simple Features for R: Standardized Support for Spatial Vector Data.” The R Journal. https://journal.r-project.org/archive/2018/RJ-2018-009/index.html.