# Using Proj4JS for vector reprojection

projection, proj, proj4js, reprojection, reproject, transform, transformation, epsg, srs

This example shows how to reproject vector features within OpenLayers. The baselayer shows Germany in the projection EPSG:31467 (GK 3). When one clicks on the buttons, features with geometries originally in EPSG:4326 will be transformed to the projection of the map on-the-fly.

The features are internally reprojected with the JavaScript library Proj4JS. Please note that usually you would not inlude Proj4JS the way it is done in this example. In a production environment you would furthermore have a local copy of the Proj4JS-projection definition that is hotlinked in this example (see Graticule example for how to do this).