Describir: EMPIRICAL models of urban land use :

 _____       ___     _    _      ___     _    _    _    _     _____   
|  __ \\    / _ \\  | \  / ||   / _ \\  | || | || | || | ||  / ____|| 
| |  \ ||  / //\ \\ |  \/  ||  / //\ \\ | || | || | || | || / //---`' 
| |__/ || |  ___  ||| .  . || |  ___  ||| \\_/ || | \\_/ || \ \\___   
|_____//  |_||  |_|||_|\/|_|| |_||  |_|| \____//   \____//   \_____|| 
 -----`   `-`   `-` `-`  `-`  `-`   `-`   `---`     `---`     `----`  
                                                                      
   ___    
  / _ \\  
 | / \ || 
 | \_/ || 
  \___//  
  `---`