transformScale

Description

Scale a GeoJSON from a given point by a factor of scaling (ex: factor=2 would make the GeoJSON 200% larger). If a FeatureCollection is provided, the origin point will be calculated based on each individual Feature.

Parameters

Name	Type	Description
geojson	GeoJSON	GeoJSON to be scaled
factor	number	of scaling, positive values greater than 0. Numbers between 0 and 1 will shrink the geojson, numbers greater than 1 will expand it, a factor of 1 will not change the geojson.
options?	Object	Optional parameters (default {})
options.origin?	string | Coord	Point from which the scaling will occur (string options: sw/se/nw/ne/center/centroid) (default 'centroid')
options.mutate?	boolean	allows GeoJSON input to be mutated (significant performance increase if true) (default false)

Returns

GeoJSON scaled GeoJSON

Examples

var poly = turf.polygon([
  [
    [0, 29],
    [3.5, 29],
    [2.5, 32],
    [0, 29],
  ],
]);
var scaledPoly = turf.transformScale(poly, 3);

Installation

$ npm install @turf/transform-scale

import { transformScale } from "@turf/transform-scale";
const result = transformScale(...);

$ npm install @turf/turf

import * as turf from "@turf/turf";
const result = turf.transformScale(...);