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ecospat (version 4.1.1)

ecospat.recstrat_regl: Random Ecologically Stratified Sampling of equal numbers

Description

This function randomly takes an equal number of samples per class in the stratification layer.

Usage

ecospat.recstrat_regl(in_grid, sample_no)

Value

Returns a dataframe with the selected sampling locations their coordinates and the strata they belong in.

Arguments

in_grid

The stratification grid (SpatRaster) to be sampled.

sample_no

The total number of pixels to be sampled.

Author

Achilleas Psomas achilleas.psomas@wsl.ch and Niklaus E. Zimmermann niklaus.zimmermann@wsl.ch

Details

The number of classes in the stratification layer is determined automatically from the integer input map. If the number of pixels in a class is higher than the number of samples, then a random selection without re-substitution is performed, otherwise all pixels of that class are selected.

See Also

ecospat.recstrat_prop ecospat.rcls.grd

Examples

Run this code

  library(terra)
  library(classInt)
  library(biomod2)
  
  data("bioclim_current")
  bioclim_current <- terra::rast(bioclim_current)
  bio3 <- bioclim_current[["bio3"]]
  bio12 <- bioclim_current[["bio12"]]

    
  B3.rcl<-ecospat.rcls.grd(bio3,9) 
  B12.rcl<-ecospat.rcls.grd(bio12,9)
  B3B12.comb <- B12.rcl+B3.rcl*10
    
  B3B12.regl_samples <- ecospat.recstrat_prop(B3B12.comb,100)
  
  plot(B3B12.comb)
  points(B3B12.regl_samples$x,B3B12.regl_samples$y,pch=16,cex=0.6,col=B3B12.regl_samples$class)

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