Simplify with Ramer-Douglas-Peucker

Reduces the number of points in each geometry by removing vertices that deviate less than epsilon from the simplified path. Accepts linestrings, multilinestrings, polygons, and multipolygons.

Usage

ga_simplify(geometry, epsilon)

Arguments

geometry

a GeoArrow linestring, multilinestring, polygon, or multipolygon array

epsilon

the simplification tolerance; length 1 or the same length as geometry

Value

a GeoArrow array of the same geometry type as the input

References

Simplify

See also

Other simplify: ga_simplify_idx(), ga_simplify_vw()

Examples

fp <- system.file("shape/nc.shp", package = "sf")
nc <- as.data.frame(read_shapefile(fp))

# a bigger epsilon drops more vertices
head(as.vector(ga_n_coords(nc$geometry)), 3)
#> [1] 27 26 28
head(as.vector(ga_n_coords(ga_simplify(nc$geometry, 0.01))), 3)
#> [1] 19 14 14
head(as.vector(ga_n_coords(ga_simplify(nc$geometry, 0.1))), 3)
#> [1] 5 5 5