Data Visualization

Plot multiple countries on the world map

Yang Liu / 2023-05-29

This post will show it’s quite easy to download and plot the administrative areas of multiple countries on the world map. I will also showcase a bug that puzzled me for a long time and I recently figured out: strange connecting lines among countries! […] (You may download the world map from Github) suppressPackageStartupMessages({ library("data.table") library("ggplot2")…

Data Visualization

Spatial data in R: Dividing raster layers into equal-area rings

Yang Liu / 2018-07-20

This data visualization example include: * Import .img file as a raster * Turn raster into a data.frame of points (coordinates) and values * Dividing the points into 100 equal-area rings * Calculate Built-up Area/Urban Extent for each ring * Turn dataframe into raster * Plot multiple figures on the same color scale […] […] list.of.packages <- c("raster",…