@turf/projection

What is @turf/projection?

@turf/projection is a module within the Turf.js library that provides functionality for projecting geographical coordinates. It allows for the conversion of coordinates between different coordinate reference systems (CRS), which is essential for various geospatial analyses and visualizations.

What are @turf/projection's main functionalities?

toMercator

Converts a GeoJSON object from geographic coordinates (longitude, latitude) to Mercator (x, y) coordinates.

const turf = require('@turf/turf');
const point = turf.point([-75.343, 39.984]);
const projected = turf.toMercator(point);
console.log(projected);

toWgs84

Converts a GeoJSON object from Mercator (x, y) coordinates to geographic coordinates (longitude, latitude).

const turf = require('@turf/turf');
const point = turf.point([0, 0]);
const projected = turf.toWgs84(point);
console.log(projected);

Other packages similar to @turf/projection

proj4

Proj4 is a JavaScript library for converting coordinates between different coordinate reference systems. It is highly versatile and supports a wide range of projections. Compared to @turf/projection, proj4 offers more extensive support for various CRS and is often used in more complex geospatial applications.

README

@turf/projection

toMercator

Converts a WGS84 GeoJSON object into Mercator (EPSG:900913) projection

Parameters

• geojson (GeoJSON | Position) WGS84 GeoJSON object
• options Object? Optional parameters
  • options.mutate boolean allows GeoJSON input to be mutated (significant performance increase if true) (optional, default false)

Examples

var pt = turf.point([-71,41]);
var converted = turf.toMercator(pt);

//addToMap
var addToMap = [pt, converted];

Returns GeoJSON Projected GeoJSON

toWgs84

Converts a Mercator (EPSG:900913) GeoJSON object into WGS84 projection

Parameters

• geojson (GeoJSON | Position) Mercator GeoJSON object
• options Object? Optional parameters
  • options.mutate boolean allows GeoJSON input to be mutated (significant performance increase if true) (optional, default false)

Examples

var pt = turf.point([-7903683.846322424, 5012341.663847514]);
var converted = turf.toWgs84(pt);

//addToMap
var addToMap = [pt, converted];

Returns GeoJSON Projected GeoJSON

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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 @turf/projection

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

$ npm install @turf/turf