Compute the length of linestrings

These functions calculate the total length of each linestring using different metric spaces. Use the geodesic or haversine variants for geographic coordinates, and euclidean for projected coordinates.

Calculates the geodesic length of each linestring or multilinestring using the Vincenty formula on an ellipsoidal model of the earth. Returns NA if the algorithm fails to converge. Results are in meters.

Usage

ga_length_euclidean(x)

ga_length_haversine(x)

ga_length_geodesic(x)

ga_length_rhumb(x)

ga_length_vincenty(x)

Arguments

x

a GeoArrow linestring or multilinestring array

Value

a double vector of length values

a double vector of length values in meters

References

Length, Euclidean, Haversine, Geodesic, Rhumb

VincentyLength

Examples

# Raleigh to Charlotte, and Raleigh to Wilmington
trips <- geoarrow::as_geoarrow_array(sf::st_sfc(
  sf::st_linestring(rbind(c(-78.6382, 35.7796), c(-80.8431, 35.2271))),
  sf::st_linestring(rbind(c(-78.6382, 35.7796), c(-77.9447, 34.2257)))
))

# degrees, then meters
as.vector(ga_length_euclidean(trips))
#> [1] 2.273068 1.701631
as.vector(ga_length_geodesic(trips))
#> [1] 209216.6 183645.3