# Generate a Landscape Using Hierarchical Curdling

### Description

A function to generate a multidimensional landscape with each cell assigned a value of zero or one based on a the successive assignment of habitat at different spatial scales.

### Usage

1 | ```
HierarchicalCurdling(DimExtents, HierBoxes, HierProp)
``` |

### Arguments

`DimExtents` |
An integer vector with the length of the desired output in each dimension. |

`HierBoxes` |
A matrix of integer values describing the size of the assignment boxes in each dimension and at each spatial hierarchy. Each row of the matrix represents a different hierarchy. The columns within each row describes the extent of the allocation volume in each dimension. If |

`HierProp` |
An integer vector containing the number of allocation volumes to retain at each hierarchical sweep. If |

### Value

A vector of length `prod(DimExtents)`

and with a dimensional extent attribute set to `DimExtents`

. Each element contains a zero or a one depending on the outcome of the hierarcical allocation.

### Author(s)

Joseph Chipperfield <joechip90@googlemail.com>

### References

With, K. A. (1997) The application of neutral landscape models in conservation biology. *Conservation Biology*, 11, 1069-1080.

With, K. A. and King A. W. (1997) The use and misuse of neutral landscapes models in ecology. *Oikos*, 79, 219-229.

### See Also

`PercolationMap`

`SpectralSynthesis`

### Examples

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 | ```
# Create a 512 x 512 landscape allocated on three hierarchical levels. On the
# first hierarchical divsion the landscape is divded into 64 cells of 64 x 64
# units each. 48 of these 64 cells are randomly selected as habitable. Each
# of selected cells in the first hierarchical division is split again into 64
# cells of 8 x 8 units each. 48 of these cells are randomly selected for
# allocation in the final level. The final hierarchical allocation, divides
# the remaining selected cells into 64 1 x 1 cells. 32 of these 64 cells are
# randomly selected as habitable
# Dimension of output landscape
dims.in <- rep(512,2)
# Number of cells to select at each hierarchical level
props <- c(48,48,32)
# Create matrix of allocation units at each hierarchical level
hier.mat <- rep(NA, length(props) * length(dims.in))
dim(hier.mat) <- c(length(props), length(dims.in))
hier.mat[1,] <- c(64,64) # 64 x 64 allocation cells in first hierarchy
hier.mat[2,] <- c(8,8) # 8 x 8 allocation cells in second hierarchy
hier.mat[3,] <- c(1,1) # 1 x 1 allocation cells in third hierarchy
# Run the hierarchical curdling
output.map <- HierarchicalCurdling(dims.in, hier.mat, props)
image(output.map, col = c("black", "white"))
``` |