https://github.com/derhuerst/transform-coordinates

Transform coordinates from one coordinate system to another.
https://github.com/derhuerst/transform-coordinates

coordinates epsg geospatial gis transform

Last synced: 5 days ago
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Transform coordinates from one coordinate system to another.

• Host: GitHub
• URL: https://github.com/derhuerst/transform-coordinates
• Owner: derhuerst
• License: isc
• Created: 2017-08-29T15:07:23.000Z (about 7 years ago)
• Default Branch: master
• Last Pushed: 2023-11-06T12:12:17.000Z (about 1 year ago)
• Last Synced: 2024-10-03T23:53:55.067Z (about 1 month ago)
• Topics: coordinates, epsg, geospatial, gis, transform
• Language: JavaScript
• Homepage: https://github.com/derhuerst/transform-coordinates
• Size: 10.7 KB
• Stars: 18
• Watchers: 2
• Forks: 5
• Open Issues: 0
• Metadata Files:
  • Readme: readme.md
  • License: license.md

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README

        
# transform-coordinates

**Transform coordinates from one [coordinate system](https://en.wikipedia.org/wiki/Geographic_coordinate_system) to another.** Just a wrapper around [`proj4`](https://github.com/proj4js/proj4js) and [`epsg-index`](https://github.com/derhuerst/epsg-index).

[![npm version](https://img.shields.io/npm/v/transform-coordinates.svg)](https://www.npmjs.com/package/transform-coordinates)

[![build status](https://api.travis-ci.org/derhuerst/transform-coordinates.svg?branch=master)](https://travis-ci.org/derhuerst/transform-coordinates)

![ISC-licensed](https://img.shields.io/github/license/derhuerst/transform-coordinates.svg)

![minimum Node.js version](https://img.shields.io/node/v/transform-coordinates.svg)

[![chat with me on Gitter](https://img.shields.io/badge/chat%20with%20me-on%20gitter-512e92.svg)](https://gitter.im/derhuerst)

[![support me via GitHub Sponsors](https://img.shields.io/badge/support%20me-donate-fa7664.svg)](https://github.com/sponsors/derhuerst)

## Installing

```shell

npm install transform-coordinates

```

## Rationale

[`proj4`](https://github.com/proj4js/proj4js) 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](https://epsg.io/) has an index of those strings. [`epsg-index`](https://github.com/derhuerst/epsg-index) is an offline copy of them.

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

## Usage

```js

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()`](https://github.com/proj4js/proj4js#using).

## See also

- [`projections`](https://github.com/juliuste/projections) – Collection of (stereographic) map/coordinate projections.

- [`proj4`](https://github.com/proj4js/proj4js) – library to transform coordinates from one coordinate system to another

- [`epsg-index`](https://github.com/derhuerst/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](https://github.com/derhuerst/transform-coordinates/issues).