Joint entropy \[H(x, y)\]

## Arguments

- landscape
A categorical raster object: SpatRaster; Raster* Layer, Stack, Brick; stars or a list of SpatRasters.

- neighbourhood
The number of directions in which cell adjacencies are considered as neighbours: 4 (rook's case) or 8 (queen's case). The default is 4.

- ordered
The type of pairs considered. Either ordered (TRUE) or unordered (FALSE). The default is TRUE.

- base
The unit in which entropy is measured. The default is "log2", which compute entropy in "bits". "log" and "log10" can be also used.

## References

Nowosad J., TF Stepinski. 2019. Information theory as a consistent framework for quantification and classification of landscape patterns. https://doi.org/10.1007/s10980-019-00830-x