glob.change | R Documentation |
The function glob.change
computes a set of three global change metrics for comparison
between two polygon sets. These metrics are outlined in Robertson et al. (2007; Table 4).
glob.change(T1, T2)
T1 |
a |
T2 |
a |
glob.change
computes three change metrics, detailed below, that can be used to quantify changes
between two polygon sets:
NumRatio
– ratio between the number of polygons in T2
and T1
;
\mathtt{NumRatio} = \frac{\#(T1)}{\#(T2)}
AreaRatio
– ratio between the areas of polygons in T2 and T1;
\mathtt{AreaRatio} = \frac{A(T2)}{A(T1)}
AvgAreaRatio
– ratio between the AreaRatio
and NumRatio
;
\mathtt{AvgAreaRatio} = \frac{\mathtt{AreaRatio}}{\mathtt{NumRatio}} = \frac{\frac{A(T2)}{A(T1)}}{\frac{\#(T1)}{\#(T2)}}
A list
object with three elements - Results for the NumRatio
, AreaRatio
, and AvgAreaRatio
metrics.
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