Converts between the transform's target coordinates and the output's coordinate system, e.g. proj4('EPSG:4326', 'EPSG:3857').
proj4('EPSG:4326', 'EPSG:3857')
Transform target → output coordinates.
Output → transform target coordinates.
Converts between the transform's target coordinates and the output's coordinate system, e.g.
proj4('EPSG:4326', 'EPSG:3857').