Notes on how to make contour maps in R As a retired Geophysicist, I spent a career making contour maps. I have found it to be challenging to make good contour maps in R, and so as part of my own learning process, I have documented the necessary steps in hopes that this may help others involved in the same struggles.
Ultimately I want to create filled contours that represent a surface, based on some random collection of input points, and display those contours on top of a detailed basemap, such as OpenStreetMap.
