turf-simplify

simplify geographic shapes

turf.simplify(feature, tolerance, highQuality)

Takes a LineString or Polygon and returns a simplified version. Internally uses simplify-js to perform simplification.

Parameters

parameter	type	description
feature	Feature.<LineString	Polygon>
tolerance	Number	simplification tolerance
highQuality	Boolean	whether or not to spend more time to create a higher-quality simplification with a different algorithm

Example

var feature = {
  "type": "Feature",
  "properties": {},
  "geometry": {
    "type": "Polygon",
    "coordinates": [[
      [-70.603637, -33.399918],
      [-70.614624, -33.395332],
      [-70.639343, -33.392466],
      [-70.659942, -33.394759],
      [-70.683975, -33.404504],
      [-70.697021, -33.419406],
      [-70.701141, -33.434306],
      [-70.700454, -33.446339],
      [-70.694274, -33.458369],
      [-70.682601, -33.465816],
      [-70.668869, -33.472117],
      [-70.646209, -33.473835],
      [-70.624923, -33.472117],
      [-70.609817, -33.468107],
      [-70.595397, -33.458369],
      [-70.587158, -33.442901],
      [-70.587158, -33.426283],
      [-70.590591, -33.414248],
      [-70.594711, -33.406224],
      [-70.603637, -33.399918]
    ]]
  }
};

var tolerance = 0.01;

var simplified = turf.simplify(
 feature, tolerance, false);

//=feature

//=simplified

Returns Feature.<LineString|Polygon>, a simplified feature

Installation

Requires nodejs.

$ npm install turf-simplify

Tests

$ npm test