ST_Length2D
Name
   ST_Length2D — Returns the 2-dimensional length of the geometry if it is a
				linestring or multi-linestring. This is an alias for
   
    ST_Length
   
  
Synopsis
    
     float
     
      ST_Length2D
     
     (
    
    geometry
    
     a_2dlinestring
    
    
     )
    
    ;