lawn (version 0.1.7)

lawn_concave: Concave hull polygon

Description

Takes a set of data-Point's and returns a concave hull polygon. Internally, this implements a Monotone chain algorithm

Usage

lawn_concave(points, maxEdge = 1, units = "miles", lint = FALSE)

Arguments

points

input points in a data-FeatureCollection

maxEdge

the size of an edge necessary for part of the hull to become concave (in miles)

units

used for maxEdge distance (miles [default] or kilometers)

lint

(logical) Lint or not. Uses geojsonhint. Takes up increasing time as the object to get linted increases in size, so probably use by default for small objects, but not for large if you know they are good geojson objects. Default: FALSE

Value

data-Polygon a concave hull

See Also

Other transformations: lawn_bezier, lawn_buffer, lawn_convex, lawn_erase, lawn_intersect, lawn_merge, lawn_simplify, lawn_union

Examples

points <- '{
  "type": "FeatureCollection",
  "features": [
    {
      "type": "Feature",
      "properties": {},
      "geometry": {
        "type": "Point",
        "coordinates": [-63.601226, 44.642643]
      }
    }, {
      "type": "Feature",
      "properties": {},
      "geometry": {
        "type": "Point",
        "coordinates": [-63.591442, 44.651436]
      }
    }, {
      "type": "Feature",
      "properties": {},
      "geometry": {
        "type": "Point",
        "coordinates": [-63.580799, 44.648749]
      }
    }, {
      "type": "Feature",
      "properties": {},
      "geometry": {
        "type": "Point",
        "coordinates": [-63.573589, 44.641788]
      }
    }, {
      "type": "Feature",
      "properties": {},
      "geometry": {
        "type": "Point",
        "coordinates": [-63.587665, 44.64533]
      }
    }, {
      "type": "Feature",
      "properties": {},
      "geometry": {
        "type": "Point",
        "coordinates": [-63.595218, 44.64765]
      }
    }
    ]
}'
lawn_concave(points, 1)