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@spatial/simplify

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Readme

@spatial/simplify

simplify

Takes a GeoJSON object and returns a simplified version. Internally uses simplify-js to perform simplification using the Ramer-Douglas-Peucker algorithm.

Parameters

geojson GeoJSON object to be simplified
options Object Optional parameters (optional, default {})
- options.tolerance number simplification tolerance (optional, default 1)
- options.highQuality boolean whether or not to spend more time to create a higher-quality simplification with a different algorithm (optional, default false)
- options.mutate boolean allows GeoJSON input to be mutated (significant performance increase if true) (optional, default false)

Examples

var 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]
]]);
var options = {tolerance: 0.01, highQuality: false};
var simplified = turf.simplify(geojson, options);

//addToMap
var addToMap = [geojson, simplified]

Returns GeoJSON a 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 module individually:

$ npm install @spatial/simplify

Or install the Turf module that includes it as a function:

$ npm install @turf/turf