geojson-offset-ts

Add coordinate offest to the GeoJSON. This fork is rewritten in typescript.

Installation

npm install geojson-offset-ts

yarn add geojson-offset-ts

Usage

Noted this function will UPDATE the input geojson. If there is a need to return a copy of original geojson, please let me know by openning an issue.

geojson-offset-ts supports all GeoJSON types:

• FeatureCollection
• Feature
• Geometery
  • Point
  • MultiPoint
  • LineString
  • MultiLineString
  • Polygon
  • MultiPolygon

But TopoJSON does not supported. Please convert to geojson by topojson.feature before use.

import { offset } from 'geojson-offset';
import { randomOffset } from 'geojson-offset';

let geojson = {
  type: 'FeatureCollection',
  features: [
    {
      type: 'Feature',
      geometry: {
        type: 'Point',
        coordinates: [-78, 48],
      },
      properties: {},
    },
  ],
};

/**
 * Pass the geojson and the x/y coordinate offset
 */
gejson = offset(geojson, -1, 1);

/**
 * Pass the geojson and x/y coordinate offset range. The same offset will be
 * applied to all features in the input GeoJSON.
 */
geojson = randomOffset(geojson, [0, 10], [-10, 10]);