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Calculate Area of H3 Cells

Source: R/area.R
area.Rd

These functions calculate the area of H3 cells for a given unit.

  • area_km2() calculates the area in kilometers squared

  • area_m2() calculates the area in meters squared

  • area_rads2() calculates the area in radians squared

Usage

area_km2(x)

area_m2(x)

area_rads2(x)

Arguments

x

for h3_from_points() an object of class sfc_POINT. For h3_from_strings() a character vector of H3 index IDs. For h3_from_xy() a numeric vector of longitudes.

Value

a numeric vector the same length as x

Examples

nc <- sf::st_read(system.file("shape/nc.shp", package = "sf"), quiet = TRUE)
geo <- sf::st_geometry(nc)
cells <- sfc_to_cells(geo, 5) |>
  flatten_h3()

head(area_km2(cells))
#> [1] 230.8037 231.5341 231.3662 230.6341 231.1934 231.7500
head(area_m2(cells))
#> [1] 230803680 231534107 231366169 230634132 231193430 231749967
head(area_rads2(cells))
#> [1] 5.686258e-06 5.704253e-06 5.700116e-06 5.682081e-06 5.695860e-06
#> [6] 5.709571e-06