Count the coordinates in each geometry — ga_n_coords • geoarrowrs

Returns how many vertices each geometry holds.

Usage

ga_n_coords(geometry)

Arguments

geometry: a GeoArrow geometry array

Value

an integer array of the same length as geometry

Details

Counts every coordinate that ga_coords() would return, so a closed ring counts its repeated final vertex. A null geometry gives NA.

References

See also

Other iteration: ga_coords(), ga_lines(), ga_x()

Examples

ring <- matrix(c(0, 0, 2, 0, 2, 2, 0, 2, 0, 0), ncol = 2, byrow = TRUE)
g <- geoarrow::as_geoarrow_array(sf::st_sfc(sf::st_polygon(list(ring))))

as.vector(ga_n_coords(g))
#> [1] 5