$$LSI = \frac{e_{i}} {\min e_{i}}$$
where \(e_{i}\) is the total edge length in cell surfaces and \(\min e_{i}\)
is the minimum total edge length in cell surfaces.
LSI is an 'Aggregation metric'. It is the ratio between the actual edge length of
class i and the hypothetical minimum edge length of class i. The minimum edge length equals
the edge length if class i would be maximally aggregated.
Behaviour
Equals LSI = 1 when only one squared patch is present or all
patches are maximally aggregated. Increases, without limit, as the length of the
actual edges increases, i.e. the patches become less compact.
Because the metric is based on distances or areas please make sure your data
is valid using check_landscape.