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Submitted on: 12 November 2004.
Revised on: 06 January 2005.
Accepted on: 08 February 2005.
___________________GIM International-The Worldwide Magazine for Geomatics
Submitted on: 10 March 2002.
Revised on: 05 June 2002.
Accepted on: 27 June 2002.
___________________GIM International-The Worldwide Magazine for Geomatics
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