get_random_subset_from_image: extract random subset of pixels from an image

In floriandeboissieu/biodivMapR: biodivMapR: an R package for a- and ß-diversity mapping using remotely-sensed images

Description

extract random subset of pixels from an image

Usage

get_random_subset_from_image(
  ImPath,
  MaskPath,
  nb_partitions,
  Pix_Per_Partition,
  kernel = NULL,
  MaxRAM = 0.5
)

Arguments

ImPath	character. path for the image to sample
MaskPath	character. path for the corresponding mask
nb_partitions	numeric. number of repetitions of kmeans
Pix_Per_Partition	numeric.
kernel	numeric.
MaxRAM	numeric.

Details

The returned list contains: - DataSubset: matrix of NxP of N samples and P bands - nbPix2Sample: integer giving the number of pixels sampled (only central pixel of kernel) - coordPix: a data.table with columns 'row', 'col' of pixel in the image corresponding to each row of DataSubset, and if kernel is not NULL Kind (Kernel index) and 'id' the sample ID to be used with the kernel

Value

list, see Details

floriandeboissieu/biodivMapR documentation built on March 11, 2021, 8:46 a.m.