Among
the indices of Table 3.1, those of surface
and density are already known. Here the description of the other indices.
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Index of density of contours (ED): |
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Σpij : sum of perimeters (m) of all the
objects j pertaining to category i
A: surface (m2) of the study area
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Average index of shape (MSI): |
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ni: number of objects of category / class i
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Average fractal index (MPFD): |
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Interpretation: Index value MPFD varies between 1 and 2.
The more complex the average shape of the objects of the class is,
the more its value approaches 2.
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A Index of average distance to neighbors of same category/class (MNN): |
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hij: shortest distance (m) between
the limit of
the object i and that of the nearest
object j of the same category.
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Index of dispersion distance to the neighbors
of same category/class (NNSD): |
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Coefficient of variation of the distance to the
neighbors of same category/class (NNCV): |
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4 classes of spatial objects in the study area
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Class of objects of poor aptitude (1) |
Class of objects of poor aptitude (2) |
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Class of objects of poor aptitude (3) |
Class of objects of poor aptitude (4) |
Figure 3.3 |
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Value of the indices
of structure for the 4 classes of objects in the study area illustrated in Figure 3.3 |
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