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Introduction

jpmap follows the same basic workflow as usmap: plot a map, get the map data, and transform your own coordinates into the same coordinate system.

Install the development version from GitHub:

install.packages("remotes")
remotes::install_github("yhoriuchi/jpmap")

Boundary GeoPackages are large. Install the companion jpmapdata package when you want ready-to-use boundaries, or build local files with jpmap_build_data().

library(tidyverse)
library(jpmap)

The main plotting function is plot_jpmap(). These two calls draw empty maps without adding data, labels, colors, or other options.

plot_jpmap("prefecture")
plot_jpmap("municipality", include = "Okinawa")

The data function is jp_map(), which returns an sf object.

prefectures <- jp_map("prefecture")
okinawa_municipalities <- jp_map("municipality", include = "Okinawa")

The transform function is jpmap_transform().

places <- tribble(
  ~place, ~lon, ~lat,
  "Tokyo", 139.767, 35.681,
  "Naha", 127.681, 26.212,
  "Ogasawara", 142.191, 27.094
)

places |>
  jpmap_transform(output_names = c("x", "y"))
#> # A tibble: 3 × 5
#>   place       lon   lat        x        y
#>   <chr>     <dbl> <dbl>    <dbl>    <dbl>
#> 1 Tokyo      140.  35.7  205212. -199414.
#> 2 Naha       128.  26.2 -683245.  657517.
#> 3 Ogasawara  142.  27.1  537219. -578089.

By default, the transform moves Okinawa and Ogasawara into visible inset locations. Use inset = FALSE for a literal projected map, or pass a character vector such as inset = "okinawa" to transport only selected island groups. You can also use okinawa = FALSE or ogasawara = FALSE. plot_jpmap() draws inset boxes by default; set inset_boxes = FALSE to remove them. Use xlim, ylim, x_breaks, y_breaks, x_labels, and y_labels when you want to customize the displayed longitude/latitude frame.

These binaries (installable software) and packages are in development.
They may not be fully stable and should be used with caution. We make no claims about them.
Health stats visible at Monitor.