A Method of Graphic Overlay Analysis from Grid Data and its Application in the City and Town Planning

In this paper,a method of graphic overlay analysis from the grid data is introduced.Four technical processes are proposed:A way of chain topology for converting the vector data into grid data.A specific encoding for data compression of grid mode and and its effective storage.Based on the fuzzy theoory a mathematical model of multielement comprehensive analysis is established.A border following program using in the grid merging after attribute data types overlay analysis.Finally,an application of land-use evaluation for buji(a town in Shen-zhen city) town planning is shown to examine the proposal model of grid data graphic overlay by the author.