get_y
  
  Description:
  public double get_y (
double zoom_level, 
double latitude)
  
 
  
    Gets the y position on the map using this map source's projection.
     (0, 0) is located at the top left.
    Parameters:
    
      
        | this | a MapSource | 
      
        | zoom_level | the zoom level | 
      
        | latitude | a latitude | 
    
    Returns: