pub fn farthest_point_within(
map: &DistanceMap,
subregion: &Polygon,
tolerance: f64,
max_cells: usize,
) -> Result<Farthest, FarthestError>pub fn farthest_point_within(
map: &DistanceMap,
subregion: &Polygon,
tolerance: f64,
max_cells: usize,
) -> Result<Farthest, FarthestError>