rdnaptrans.js

JavaScript implementation of RDNAPTRANS™ https://www.kadaster.nl/web/Themas/Registraties/Rijksdriehoeksmeting/Transformatie-van-coordinaten.htm

For Node.js back end and browser front end.

Install:

Generic

• clone the repo
• run npm install

Node.js

npm install --save rdnaptrans

Browser

Use the bundled version under /dist.

Usage:

The phi, lambda and h stuff in the returned Geographic object correspond with latitude, longitude and height. Due to the port, the implementation is still very close to the original Java version. Therefore, you need a few helping classes to convert from RD or ETRS89.

Node.js

const Transform = require('rdnaptrans').Transform;
const Geographic = require('rdnaptrans').Geographic;
const Cartesian = require('rdnaptrans').Cartesian;

const texelRD = new Cartesian(117380.1200, 575040.3400, 1.0000);
const texelETRS = Transform.rdnap2etrs(texelRD);
console.log(texelETRS);
/* output:
Geographic {
  phi: 53.16075304177141,
  lambda: 4.824761912426986,
  h: 42.86140355819888 }
 */

Testing

The module is built and tested for Node on Travis. However, you can run the tests yourself simply by using grunt webpack and npm test. grunt is installed through npm install -g grunt grunt-cli.

Future

TODO:

• Create geoJSON convenience functions
• Create toFixed() convenience functions
• Create convenience properties or functions for lat, lon, z on Geographic class
• Expand examples