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             ___      ______     ___     _    _   
    ___     / _ \\   /_____//   / _ \\  | || | || 
   /   ||  / //\ \\  `____ `   | / \ || | || | || 
  | [] || |  ___  || /___//    | \_/ || | \\_/ || 
   \__ || |_||  |_|| `__ `      \___//   \____//  
    -|_|| `-`   `-`  /_//       `---`     `---`   
     `-`             `-`

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Text this: Preliminary ground risk tiering for small unmanned aerial vehicles (sUAV) in metropolitan environments