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 |  _ \\   /_   _// \ \\ / //   / _ \\      ___   
 | |_| ||   -| ||-   \ \/ //   | / \ ||    /   || 
 | .  //    _| ||_    \  //    | \_/ ||   | [] || 
 |_|\_\\   /_____//    \//      \___//     \__ || 
 `-` --`   `-----`      `       `---`       -|_|| 
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發送短信 : Geographic information analysis / David O'Sullivan and David J. Unwin.