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The output of the source module may be converted to suit the input format of the target module. The grid-level information serves as the basis for spatial conversion. Two vectors and a two-dimensional matrix are used to record the linking information at the grid level. One vector stores grid-indexing information with respect to the output data of the source module, while the other vector stores grid-indexing information with respect to the input data of the target module. The relationship between the two vectors is recorded using a two-dimensional matrix. Their correspondence is shown in Table 3.

Table 3

Grid-level links

 GT1GTjGTn
GS1 GL1,1 … GL1,j … GL1,n 
… … … … … … 
GSi GLi,1 … GLi,j … GLi,n 
… … … … … … 
GSm GLm,1 … GLm,j … GLm,n 
 GT1GTjGTn
GS1 GL1,1 … GL1,j … GL1,n 
… … … … … … 
GSi GLi,1 … GLi,j … GLi,n 
… … … … … … 
GSm GLm,1 … GLm,j … GLm,n 

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