transformScale

Description

Scale GeoJSON objects from a given point by a scaling factor e.g. factor=2 would make each object 200% larger. If a FeatureCollection is provided, the origin point will be calculated based on each individual feature unless an exact

Parameters

Name	Type	Description
geojson	GeoJSON | GeometryCollection	objects 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?	Corners | 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 improvement if true) (default false)

Returns

GeoJSON | GeometryCollection scaled GeoJSON

Examples

const poly = turf.polygon([
  [
    [0, 29],
    [3.5, 29],
    [2.5, 32],
    [0, 29],
  ],
]);
const 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(...);