一种基于二元粗糙关系的栅格数据局部运算方法

One Method Study for Grid Data Local Operation Based on Binary Rough Relation

GIS中不涉及统计量的栅格数据局部运算是利用像元值之间的组合代码来表示结果的.对于两个输入图层的栅格数据,每个栅格像元的两个取值组合是一个典型的二元关系有序对,局部运算的结果其实就是由各个像元的像元值构成的一个二元关系.利用后继、前继邻域关系重新来表示栅格数据局部运算,发现如果采用后继邻域关系表示局部运算,结果就是对于第一个输入图层各种像元值重新进行一种邻域关系划分,采用前继邻域关系是对于第二个输入图层各种像元值重新进行一种邻域关系划分.并且采用前继、后继二元粗糙集,对于任一个二元关系可能会得到不同的上、下近似子集.

The grid data local operation not involving statistic was combined code result of pixel＇s value.The combination of each pixel＇s value in two input data layer was a classic binary relation ordered pair,and the result of local operation was a binary relation for each pixel＇s value.The behind and front neighborhood relation was used to represent grid data local operation in this study,and the result is a neighborhood relation classification for the first input data＇s grid value if behind neighborhood relation representation was adopted,and it is a neighborhood relation classification for the second input data＇s grid value if front neighborhood relation representation was adopted.It can likely get different upper and lower approximation for each binary relation if front and behind binary rough set was used.