Principles of the contextual analysis

To connect the thematic properties of each unit of observation with those of their neighborhood, it is essential to define the neighborhood beforehand to be considered, as well as the numerical indicator expressing this relation. The neighborhood of analysis is expressed by the moving window which identifies successively the set of neighbor entities to be processed. It is based on the topological concept of adjacency of variable order. In image mode, the definition of the moving window was already presented and its application was illustrated in the Basic Module of Spatial Analysis (B-AN), in particular in Lesson 2. We point out simply here the parameters of definition of the neighborhood in image mode and the types of operators allowing to produce the indices of arrangement.

Parameters of definition of the neighborhood:

Parameters of definition of the neighborhood in a moving window
Figure 3.5Figure 3.5
Types of contextual indices and their relationship to the indices of structure
Table 3.5Table 3.5