@turf/simplify

simplify

Simplifies the geometries in a GeoJSON object. Uses the 2d version of simplify-js.

Parameters

• geojson GeoJSON GeoJSON object to be simplified

• options Object Optional parameters (optional, default {})

  • options.tolerance number Simplification tolerance (optional, default 1)
  • options.highQuality boolean Produce a higher-quality simplification using a slower algorithm (optional, default false)
  • options.mutate boolean Allow GeoJSON input to be mutated (significant performance improvement if true) (optional, default false)

Examples

const geojson = turf.polygon([[
  [-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]
]]);
const result0_01 = turf.simplify(geojson, {tolerance: 0.01 });
const result0_005 = turf.simplify(geojson, {tolerance: 0.005 });

//addToMap
const addToMap = [geojson, result0_01, result0_005]

Returns GeoJSON Simplified GeoJSON

This module is part of the Turfjs project, an open source module collection dedicated to geographic algorithms. It is maintained in the Turfjs/turf repository, where you can create PRs and issues.

Installation

Install this single module individually:

$ npm install @turf/simplify

Or install the all-encompassing @turf/turf module that includes all modules as functions:

$ npm install @turf/turf