Visualizing Mapping Population in R I have data of texas conties and their population from Census Bureau. The population is in 1000’s. I am interested in mapping the different counties in Texas on the map.

Method

1.I will load my csv file which contains Texas counties and their population into the console 2. I will then go ahead and plot a graph using the csv file

texas<-read.csv("texas.csv")
head (texas)
##        long      lat group order state   county   pop   bin
## 1 -95.75271 31.53560     1     1 texas anderson 56474 < 1e5
## 2 -95.76989 31.55852     1     2 texas anderson 56474 < 1e5
## 3 -95.76416 31.58143     1     3 texas anderson 56474 < 1e5
## 4 -95.72979 31.58143     1     4 texas anderson 56474 < 1e5
## 5 -95.74698 31.61008     1     5 texas anderson 56474 < 1e5
## 6 -95.72405 31.63873     1     6 texas anderson 56474 < 1e5
library(ggplot2)
qplot(long,lat, data = texas)

qplot(long,lat, data = texas, geom = "polygon",group=group)

My friend asked me for the list of all the counties on the map of the United States. Here you go, my friend!

library(maps)
counties<-map_data("county")
qplot(long,lat, data = counties, geom = "polygon",group=group, fill=group)

Finally, I am going to apply the same principle of mapping the US counties on the US map to the Texas counties on Texas map. Here we go!

tx<-qplot(long,lat, data = texas, geom = "polygon",group=group, fill=bin)
tx

However, this graph is not attractive. It doesn’t even have a tittle. So, I am going to give it a title and make it more prettier!

tx+ggtitle("Population of Texas Counties")+coord_map()+scale_fill_brewer("Blues")

In the nutshell, I have taken data from the census bureau about the population of counties in Texas and put them on the map of Texas.