Author: Antoine Corcy (contact@sbin.dk)
Inheritance: extends League\Geotools\AbstractGeotools, implements League\Geotools\Convert\ConvertInterface
 /**
  * Returns a Universal Transverse Mercator projection representation of the coordinate in meters
  *
  * @return StringLiteral
  */
 public function toUniversalTransverseMercator()
 {
     $coordinate = static::getBaseCoordinate($this);
     $convert = new Convert($coordinate);
     $utm = $convert->toUniversalTransverseMercator();
     return new StringLiteral($utm);
 }