A vegetated and a bare zone with a gradual transition between them, where the chance of a cell being vegetated decreases with distance from the boundary.
Arguments
- steepness
Numeric. Shape of the vegetation-probability decline below the boundary (0-1, default: 0.5). Values near 0 produce a sparse, abrupt transition; values near 1 produce a denser, more gradual transition. The potential extent of the transition remains unchanged.
- boundary_position
Numeric. Relative position of the horizontal vegetation boundary (if not rotated) from the top (0-1, default: 0.2).
Valid values and batch sampling
A single value fixes a parameter. A length-2 vector is a range, sampled
once per landscape by create_landscapes and rejected by
create_landscape. The table below shows for each parameter:
valid values that create_landscape accepts, and
sampled ranges that create_landscapes draws from
once per landscape for any parameter left unset. The defaults shown in
Usage therefore apply to create_landscape only. Ranges that
scale with landscape size are shown for the default 100 by 100.
| Parameter | Valid | Sampled |
steepness | 0 to 1 | 0.1 to 1 |
boundary_position | 0 to 1 | 0.1 to 0.4 |
Examples
# A single landscape, with fixed values
create_landscape(
"diffuse",
params = pattern_diffuse(steepness = 0.1, boundary_position = 0.3)
)
#> Landscape: <unnamed> [pattern: diffuse]
#> -----------------------------------------
#> Dimensions: 100x100 (10000 cells)
#> Resolution: 1.0x1.0
#> Extent : xmin=0.0, xmax=100.0, ymin=0.0, ymax=100.0
#> Values : min=0.0, max=1.0
#> Parameters: width = 100, height = 100, boundary_position = 0.3, steepness = 0.1, rotation = 0
# A batch, with parameters drawn from ranges once per landscape.
# Parameters left unset vary too, over their default ranges
create_landscapes(
n = 4,
patterns = "diffuse",
params_list = list(
diffuse = pattern_diffuse(
steepness = c(0.1, 1),
boundary_position = c(0.1, 0.4)
)
)
)
#> ✔ Successfully generated all 4 training landscapes
#> $diffuse_1_rot41
#> Landscape: "diffuse_1_rot41" [pattern: diffuse]
#> -----------------------------------------
#> Dimensions: 100x100 (10000 cells)
#> Resolution: 1.0x1.0
#> Extent : xmin=0.0, xmax=100.0, ymin=0.0, ymax=100.0
#> Values : min=0.0, max=1.0
#> Parameters: width = 100, height = 100, boundary_position = 0.393685674504377, steepness = 0.206397260143422, rotation = 41
#>
#> $diffuse_2_rot304
#> Landscape: "diffuse_2_rot304" [pattern: diffuse]
#> -----------------------------------------
#> Dimensions: 100x100 (10000 cells)
#> Resolution: 1.0x1.0
#> Extent : xmin=0.0, xmax=100.0, ymin=0.0, ymax=100.0
#> Values : min=0.0, max=1.0
#> Parameters: width = 100, height = 100, boundary_position = 0.36057325869333, steepness = 0.316394871450029, rotation = 304
#>
#> $diffuse_3_rot244
#> Landscape: "diffuse_3_rot244" [pattern: diffuse]
#> -----------------------------------------
#> Dimensions: 100x100 (10000 cells)
#> Resolution: 1.0x1.0
#> Extent : xmin=0.0, xmax=100.0, ymin=0.0, ymax=100.0
#> Values : min=0.0, max=1.0
#> Parameters: width = 100, height = 100, boundary_position = 0.265111538837664, steepness = 0.154594413610175, rotation = 244
#>
#> $diffuse_4_rot179
#> Landscape: "diffuse_4_rot179" [pattern: diffuse]
#> -----------------------------------------
#> Dimensions: 100x100 (10000 cells)
#> Resolution: 1.0x1.0
#> Extent : xmin=0.0, xmax=100.0, ymin=0.0, ymax=100.0
#> Values : min=0.0, max=1.0
#> Parameters: width = 100, height = 100, boundary_position = 0.373677007760853, steepness = 0.225622180383652, rotation = 179
#>
# A batch, mixing a fixed value with a range
create_landscapes(
n = 4,
patterns = "diffuse",
params_list = list(
diffuse = pattern_diffuse(
steepness = 0.5,
boundary_position = c(0.1, 0.4)
)
)
)
#> ✔ Successfully generated all 4 training landscapes
#> $diffuse_1_rot80
#> Landscape: "diffuse_1_rot80" [pattern: diffuse]
#> -----------------------------------------
#> Dimensions: 100x100 (10000 cells)
#> Resolution: 1.0x1.0
#> Extent : xmin=0.0, xmax=100.0, ymin=0.0, ymax=100.0
#> Values : min=0.0, max=1.0
#> Parameters: width = 100, height = 100, boundary_position = 0.190730696124956, steepness = 0.5, rotation = 80
#>
#> $diffuse_2_rot2
#> Landscape: "diffuse_2_rot2" [pattern: diffuse]
#> -----------------------------------------
#> Dimensions: 100x100 (10000 cells)
#> Resolution: 1.0x1.0
#> Extent : xmin=0.0, xmax=100.0, ymin=0.0, ymax=100.0
#> Values : min=0.0, max=1.0
#> Parameters: width = 100, height = 100, boundary_position = 0.119293758925051, steepness = 0.5, rotation = 2
#>
#> $diffuse_3_rot340
#> Landscape: "diffuse_3_rot340" [pattern: diffuse]
#> -----------------------------------------
#> Dimensions: 100x100 (10000 cells)
#> Resolution: 1.0x1.0
#> Extent : xmin=0.0, xmax=100.0, ymin=0.0, ymax=100.0
#> Values : min=0.0, max=1.0
#> Parameters: width = 100, height = 100, boundary_position = 0.237901764782146, steepness = 0.5, rotation = 340
#>
#> $diffuse_4_rot15
#> Landscape: "diffuse_4_rot15" [pattern: diffuse]
#> -----------------------------------------
#> Dimensions: 100x100 (10000 cells)
#> Resolution: 1.0x1.0
#> Extent : xmin=0.0, xmax=100.0, ymin=0.0, ymax=100.0
#> Values : min=0.0, max=1.0
#> Parameters: width = 100, height = 100, boundary_position = 0.158919703494757, steepness = 0.5, rotation = 15
#>