I. Install ggmap in R
install.packages("ggmap")
library(ggmap)
II. Map plot using Stamen Maps
Drawing raster maps with ggmap
Boston Housing Prices- The Effect of Air Pollution and Teacher-Pupil Ratio
Geographical heat map of a custom property in R with ggmap
ggmap - stat_binhex and scale_fill_gradientn limits
Background maps with R and the ggmap package
III. Determining the longitude/latitude
bboxfinder.com to determine the exact longitude/latitude
IV. Map plot using Google Maps
Map Plots Created With R And Ggmap
ggmap: Spatial Visualization withggplot2
Create an Icon Map in R with ggmap and ggimage
Easy US Maps in R - Thanksgiving Edition
R에서 ggmap 불러오기(Google API 등록과정)
V. References : Plot using ggplot2, map, ...
Lesson 2: Visualizing Data Using ggplot2
how to create a subway map visualisation of my data
How to draw connecting routes on map with R
VI. References
Ancient Rome’s Roads Reimagined as a Modern Subway Map
curl package not available for several R packages