random_search: Randomize the output of the Genetic Algorithm

In windfarmGA: Genetic Algorithm for Wind Farm Layout Optimization

Randomize the output of the Genetic Algorithm

Description

Jitter the best GA layouts inside their grid cells and re-evaluate energy. Use this as a short post-search after genetic_algorithm(). Terrain and Weibull follow the GA flags when terrain / weibull are NULL. Terrain rasters from the GA are reused when stored in result; pass a DEM to rebuild. Weibull rasters are not stored; pass weibull_src again if needed.

Usage

random_search(
  result,
  area,
  runs = 20,
  best = 1,
  plot = FALSE,
  max_dist = 2.2,
  terrain = NULL,
  weibull = NULL,
  weibull_src = NULL,
  ccl = NULL,
  ccl_roughness = NULL
)

Arguments

result	The resulting matrix of the function genetic_algorithm
area	Site polygon (sf, SpatialPolygons, or coordinate matrix). Must be projected in metres.
runs	How many jittered layouts to try per best start. Default is 20.
best	How many distinct best layouts to refine. Default is 1.
plot	Draw the random-search layouts
max_dist	A numeric value multiplied by the rotor radius to perform collision checks. Default is 2.2
terrain	NULL (default) follows the GA and reuses result$terrainModel. TRUE downloads only if nothing is stored. A DEM rebuilds the model. FALSE skips terrain.
weibull	NULL follows the GA flag. Weibull rasters are not stored; pass weibull_src (or a speed raster as weibull) again. Giving weibull_src is enough; you do not also need weibull = TRUE.
weibull_src	list(k, a) shape and scale rasters (e.g. Global Wind Atlas combined-Weibull-k / combined-Weibull-A).
ccl	Path to a Corine Land Cover raster when terrain is on.
ccl_roughness	Path to the CLC legend CSV (Rauhigkeit_z column).

Value

Returns a list.

See Also

Other Randomization: plot_random_search(), random_search_single()

Examples

new <- random_search(resultrect, sp_polygon, runs = 20, best = 4)
plot_random_search(resultRS = new, result = resultrect, area = sp_polygon, best = 2)

windfarmGA documentation built on Sept. 14, 2026, 9:08 a.m.