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Calculate geographic distance via Haversine formula (helper)

Source: R/helper_indices.R
geodist_helper.Rd

Computes the geographic (Haversine) distance in meters between two coordinate pairs, or returns 0 for single-site (order=1) calculations when vec_to is NULL.

Usage

geodist_helper(
  vec_from,
  vec_to = NULL,
  coord_cols = c("centroid_lon", "centroid_lat")
)

Arguments

vec_from

Numeric vector of length 2, or a named vector containing coordinates. If named, should include names given by coord_cols.

vec_to

Optional numeric vector of length 2 (destination coordinates); if NULL (default), the function returns 0.

coord_cols

Character vector of length 2 giving the names of the longitude and latitude elements in vec_from/vec_to when those are named vectors. Defaults to c("x", "y").

Value

Numeric distance in meters between the two points, or 0 if vec_to is NULL.