transform-coordinates

Transform coordinates from one coordinate system to another. Just a wrapper around proj4 and epsg-index.

Installing

npm install transform-coordinates

Rationale

proj4 is a battle-proven tool for converting from one any coordinate system into any other. You need to specify a long and complicated string for both system though, to tell proj4 how to convert.

epsg.io has an index of those strings. epsg-index is an offline copy of them.

This module glues together proj4 and epsg-index and returns a clean API.

Usage

const transformation = require('transform-coordinates')

const transform = transformation('EPSG:4326', '3068') // WGS 84 to Soldner Berlin

console.error(transform.forward({x: 13.4105, y: 52.5034}))
// {
// 	x: 25405.407133664165,
// 	y: 19607.826100560924,
// 	z: -40.94089552294463
// }

transformation(from, to) returns a proj4 object with forward() and inverse().

See also

• projections – Collection of (stereographic) map/coordinate projections.
• proj4 – library to transform coordinates from one coordinate system to another
• epsg-index – A machine-readable index of all EPSG coordinate systems.

Contributing

If you have a question or have difficulties using transform-coordinates, please double-check your code and setup first. If you think you have found a bug or want to propose a feature, refer to the issues page.