This function creates a concave hull around a set of points. The result is added as a source to the map, which can then be styled using add_fill_layer(), etc.
turf_concave_hull(
map,
layer_id = NULL,
data = NULL,
coordinates = NULL,
max_edge = NULL,
units = "kilometers",
source_id,
input_id = NULL
)The map or proxy object for method chaining.
A mapboxgl, maplibre, mapboxgl_proxy, or maplibre_proxy object.
The ID of a layer or source containing points (mutually exclusive with data and coordinates).
An sf object containing points (mutually exclusive with layer_id and coordinates).
A list of coordinate pairs list(c(lng,lat), c(lng,lat), ...) for multiple points (mutually exclusive with layer_id and data).
The maximum edge length for the concave hull. If NULL (default), an optimal value is calculated automatically.
The units for max_edge. One of "meters", "kilometers", "miles", etc.
The ID for the new source containing the concave hull. Required.
Optional. Character string specifying the Shiny input ID suffix for storing results. If NULL (default), no input is registered. For proxy operations, the result will be available as input[[paste0(map_id, "_turf_", input_id)]].
If max_edge is too small and no concave hull can be computed, the function will automatically calculate an optimal max_edge value based on point distances. If that fails, it falls back to a convex hull to ensure a result is always returned.