[data visualization application] draw spatial map (with R language code)

R-tmap Map space with compass and scale

tmap brief introduction

Speaking of drawing visualization works related to spatial data ,R Language is still better than Python It's much more convenient . Here we will briefly introduce tmap Spatial data visualization drawing package , Official website (https://mtennekes.github.io/tmap/) There are still many excellent renderings , as follows ：

It is worth noting that ,tmap  Having something similar to ggplot2 “ Layers ” Principle of grammar drawing , be familiar with ggplot2 The drawing partner will surely get started quickly

. Of course, it also has many drawing functions , However, highly customized space visualization works are required . Next , Let's use a concrete example to tmap The main drawing functions are described .

02. Example show

The required shp The main documents are ：country、province、world Three shp File and for marking the city name city file . Read the code as follows ：

library(rgdal)library(tmap)library(tmaptools)library(sp)
country <- readOGR("bou1_4l.shp")province <- readOGR("prov