4SHEPHERD ID H. Information integration and GIS in Geographical Information Systems:Principles and Application( Vol. 2) [C]//Maguire D J, Goodchild M F, Rhind D W (ed). Longman. London, 1991: 337--360.
5MARTIN D,BRACKEN I. The integration and so- cioeconomic and physical resource data for applied landmanagement information systems [ J ]. Applied Geography,1993,13(1) :45--53.