Submitted on: 23 May 2001.
Revised on: 18 July 2001.
Accepted on: 22 August 2001.
___________________IEEE Geoscience and Remote Sensing Letters
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Submitted on: 21 August 2005.
Revised on: 14 December 2005.
Accepted on: 30 January 2006.
___________________IEEE Geoscience and Remote Sensing Letters
Submitted on: 14 March 1999.
Revised on: 12 June 1999.
Accepted on: 11 August 1999.
___________________IEEE Geoscience and Remote Sensing Letters
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