orthometric true ellipsoidal
NGS

					
						
							
						
					
						
					
						http://en.wikipedia.org/wiki/Metre
								    
						
					
					
					
						
							
							
							
							
							
							
							
							
						
					
					
						
							
							
							
							
							
							
							
							
						
					
					
						
							
							
							
						
						
							
							
							
						
						
							NAVD 88
							2003.0