knitr::opts_chunk$set( collapse = TRUE, comment = "#>", fig.argin = "center", fig.path = "man/figures/README-", warning = FALSE)
The jpmesh package is a package that makes it easy to use "regional mesh (i.e. mesh code JIS X 0410 )" used in Japan from R. Regional mesh is a code given when subdividing Japanese landscape into rectangular subregions by latitude and longitude. Depending on the accuracy of the code, different regional mesh length. By using the same mesh in statistical survey etc., it will become possible to handle the survey results of a large area in the area mesh unit.
In jpmesh, mesh codes and latitude and longitude coordinates are compatible with mesh codes from the first region mesh, which is the standard region mesh, to the quarter regional mesh of the divided region mesh (from 80 km to 100 m). Features include "conversion from latitude and longitude to regional mesh", "acquisition of latitude and longitude from regional mesh", "mapping on prefecture unit and leaflet".
From CRAN
install.packages("jpmesh")
For developers
# the development version from r-universe: install.packages("jpmesh", repos = "https://uribo.r-universe.dev")
library(jpmesh)
meshcode(5133) # 80km meshcode(513377) # 10km meshcode(51337783) # 1km meshcode(513377831) # 500m meshcode(5133778312) # 250m meshcode(51337783123) # 125m meshcode(5133778300, .type = "subdivision") # 100m
Return the latitude and longitude for specifying the mesh range from the mesh code.
mesh_to_coords(5133) # 80km mesh_to_coords(513377) # 10km mesh_to_coords(51337783) # 1km mesh_to_coords(513377831) # 500m mesh_to_coords(5133778312) # 250m mesh_to_coords(51337783123) # 125m
Find the mesh code within the range from latitude and longitude.
coords_to_mesh(133, 34) # default as 1km meshcode coords_to_mesh(133, 34, to_mesh_size = 80) coords_to_mesh(133, 34, to_mesh_size = 0.125)
There is mesh_convert()
as a function to change the mesh size more freely.
# Scale up mesh_convert("52350432", 80) # Scale down mesh_convert("52350432", 0.500)
# Returns a finer mesh of the area of the mesh codes # Such as, 80km to 10km mesh codes. coords_to_mesh(133, 34, 80) %>% fine_separate() # the value of the adjacent mesh codes coords_to_mesh(133, 34, 80) %>% neighbor_mesh() coords_to_mesh(133, 34, 0.5) %>% neighbor_mesh()
Drawing a simplified Japanese map based on the mesh code.
library(sf) plot(st_geometry(jpnrect))
library(ggplot2) ggplot() + geom_sf(data = jpnrect)
Dataset of mesh code for prefectures.
set.seed(71) administration_mesh(code = 33, to_mesh_size = 80) %>% head() %>% knitr::kable()
Example)
# For leaflet and mapview library(leaflet) leaflet() %>% addTiles() %>% addProviderTiles("OpenStreetMap.BlackAndWhite") %>% addPolygons(data = administration_mesh(code = 33101, to_mesh_size = 1))
ggplot() + geom_sf(data = administration_mesh(code = 33, to_mesh_size = 1))
ggsave( ggplot() + geom_sf(data = administration_mesh(code = 33, to_mesh_size = 1)), filename = "man/figures/README-mesh_pref33_map-1.png", width = 8, height = 6, units = "in")
Please note that this project is released with a Contributor Code of Conduct. By participating in this project you agree to abide by its terms.
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