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Population grids

Source: R/layers-raster.R
mn_population.Rd

Estimated population per grid cell from WorldPop (2015 to 2030, constrained to built-up areas), at 1 km or 100 m. The national file for the year is downloaded once from WorldPop (0.4 MB at 1 km, 11 MB at 100 m) and cached. Use mn_zonal() to sum it over aimags, soums or khoroos.

Usage

mn_population(
  year = 2025,
  resolution = c("1km", "100m"),
  within = NULL,
  mask = TRUE,
  crs = NULL
)

Arguments

year

A year from 2015 to 2030 (years after the last census are projections).

resolution

"1km" or "100m".

within

Area to return (names or codes). Required for the online resolutions: "90m" elevation and "10m" land cover.

mask

If TRUE (default), cells outside Mongolia (or outside within) are set to NA.

crs

Coordinate reference system of the result. NULL (default) keeps longitude/latitude (EPSG:4326). Use "albers", "lcc" or "utm" for a projection suited to Mongolia (see mn_crs()), or any value accepted by sf::st_crs().

Value

A terra SpatRaster of people per cell.

Source

WorldPop (www.worldpop.org), Global 2015-2030 constrained population counts, release R2025A. CC BY 4.0.

See also

Other raster layers: mn_elevation(), mn_landcover(), mn_zonal()

Examples

pop <- mn_population(2025)
#> ℹ Downloading WorldPop population 2025 (1km); this happens once.
terra::plot(log10(pop))

mn_zonal(pop, mn_aimags())
#> Simple feature collection with 22 features and 16 fields
#> Geometry type: MULTIPOLYGON
#> Dimension:     XY
#> Bounding box:  xmin: 87.7345 ymin: 41.58183 xmax: 119.9315 ymax: 52.14835
#> Geodetic CRS:  WGS 84
#> # A tibble: 22 × 17
#>    pcode name      name_en name_mn name_mns level type  number iso_code nso_code
#>  * <chr> <chr>     <chr>   <chr>   <chr>    <chr> <chr>  <int> <chr>    <chr>   
#>  1 MN11  Ulaanbaa… Ulaanb… Улаанб… Ulaanba… aimag capi…     NA MN-1     511     
#>  2 MN21  Dornod    Dornod  Дорнод  Dornod   aimag aimag     NA MN-061   421     
#>  3 MN22  Sukhbaat… Sukhba… Сүхбаа… Sükhbaa… aimag aimag     NA MN-051   422     
#>  4 MN23  Khentii   Khentii Хэнтий  Khentii  aimag aimag     NA MN-039   423     
#>  5 MN41  Tuv       Tuv     Төв     Töv      aimag aimag     NA MN-047   341     
#>  6 MN42  Govisumb… Govisu… Говьсү… Govisüm… aimag aimag     NA MN-064   342     
#>  7 MN43  Selenge   Selenge Сэлэнгэ Selenge  aimag aimag     NA MN-049   343     
#>  8 MN44  Dornogovi Dornog… Дорног… Dornogo… aimag aimag     NA MN-063   344     
#>  9 MN45  Darkhan-… Darkha… Дархан… Darkhan… aimag aimag     NA MN-037   345     
#> 10 MN46  Umnugovi  Umnugo… Өмнөго… Ömnögovi aimag aimag     NA MN-053   346     
#> # ℹ 12 more rows
#> # ℹ 7 more variables: parent_pcode <chr>, region_pcode <chr>,
#> #   aimag_pcode <chr>, soum_pcode <chr>, area_km2 <dbl>,
#> #   geometry <MULTIPOLYGON [°]>, value <dbl>