Articles • jpmap

Package positioning, data policy, and how jpmap differs from related tools.

Related Packages: How jpmap differs from other R packages and scripts for Japan maps.
Boundary Data Policy: Where jpmap boundary data comes from and how disputed-territory shapes are handled.

Install jpmap, get boundary data, import maps, and transform coordinates.

Introduction: Install jpmap and learn the three basic functions: plot a map, load map data, and transform coordinates.
Download Boundary Data: Install companion boundary data or build MLIT N03 GeoPackage files locally.
Import Boundary Data: Load companion or locally built boundary GeoPackages with jp_map(), plot_jpmap(), and sf.
Transform Data: Move longitude/latitude data into the same projection and inset layout used by jpmap maps.

Simple plotting workflows using the bundled GDP and U.S. base datasets.

Plot Prefectural Choropleth Maps: Join prefecture-level GDP data to a Japan map and map one fill variable.
Plot Prefectural Point Maps: Transform U.S. base coordinates and add a single point variable to a prefecture map.
Plot Municipal Choropleth Maps: Use Okinawa municipal boundaries and map municipality population.
Plot Municipal Point Maps: Plot selected U.S. base points on an Okinawa municipal map using one point variable.
Interactive Web Maps with leaflet: Use jpmap boundary data in Leaflet, Quarto, pkgdown, and Shiny-style web maps.

Control island insets and answer common map questions.

Okinawa and Ogasawara Insets: Include, exclude, or show Okinawa and Ogasawara as transported insets.
FAQ: Short answers about boundary data, inset behavior, and adding your own data.