http://reply.papertrans.cn/1/18/1796/1796-31.png
Submitted on: 04 April 2002.
Revised on: 25 May 2002.
Accepted on: 28 June 2002.
___________________Annals of GIS---TAYLOR & FRANCIS LTD
Submitted on: 16 February 2001.
Revised on: 30 April 2001.
Accepted on: 21 June 2001.
___________________Annals of GIS---TAYLOR & FRANCIS LTD
Submitted on: 22 August 2001.
Revised on: 30 October 2001.
Accepted on: 17 December 2001.
___________________Annals of GIS---TAYLOR & FRANCIS LTD
Submitted on: 03 September 2020.
Revised on: 27 November 2020.
Accepted on: 23 December 2020.
___________________Annals of GIS---TAYLOR & FRANCIS LTD
http://reply.papertrans.cn/1/18/1796/1796-36.png