An introduction to geographical information systems / Ian Heywood, Sarah Cornelius, Steve Carver. Geographical information systems Heywood, D. Ian. Cornelius, Sarah. Carver, Steve. Geographic information systems. G70.212 .H49 2011 910.285 22 HEI Includes bibliographical references and index. Harlow, England ; Toronto : Prentice Hall, 2011. 2011. 2011 Text xxxiv, 446 p. : eng