References
nLongley, Paul et. al (2005). Geographic Information Systems and Science.
2nd ed. England: John Wiley
& Sons, Ltd.
nde By, Royce A., et. al. (2001). Principles of Geographic Information System: An Introductory
Textbook. Royce de By (ed). Netherlands: International
Institute for Geoinformation Science
and Earth Observation (ITC).