$$TE = \sum \limits_{k = 1}^{m} e_{ik}$$
where \(e_{ik}\) is the edge lengths in meters.
TE is an 'Area and edge metric'. Total (class) edge includes all edges between class i and
all other classes k. It measures the configuration of the landscape because a highly
fragmented landscape will have many edges. However, total edge is an absolute measure,
making comparisons among landscapes with different total areas difficult. If
count_boundary = TRUE also edges to the landscape boundary are included.
Because the metric is based on distances or areas please make sure your data
is valid using check_landscape.
Behaviour
Equals TE = 0 if all cells are edge cells. Increases, without limit,
as landscape becomes more fragmented