* @return conversion factor : value in meters = factor * (value in units)
* @throws Exception if not valid unit, or not convertible to meters
*/
protected static double getMetersConversionFactor( String unitsString) throws Exception {
SimpleUnit unit = SimpleUnit.factoryWithExceptions(unitsString);
return unit.convertTo(1.0, SimpleUnit.meterUnit);
}
protected DateUnit timeUnit;
public PointObsDatasetImpl() {