create_mask_from_threshold: create a mask based on NDVI, Green reflectance and NIR...

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

Description

create a mask based on NDVI, Green reflectance and NIR reflectance NDVI (min) threshold eliminates non vegetated pixels Blue (max) threshold eliminates Clouds NIR (min) threshold eliminates shadows ! only valid if Optical data!!

Usage

create_mask_from_threshold(
  ImPath,
  MaskPath,
  MaskPath_Update,
  NDVI_Thresh,
  Blue_Thresh,
  NIR_Thresh,
  Blue = 480,
  Red = 690,
  NIR = 835
)

Arguments

ImPath	character. Full path of a raster file
MaskPath	character. Full path of the mask to be used with the raster file
MaskPath_Update	character. Full path of the updated mask to be used with the raster file
NDVI_Thresh	numeric. NDVI threshold applied to produce a mask (select pixels with NDVI>NDVI_Thresh)
Blue_Thresh	numeric. Blue threshold applied to produce a mask (select pixels with Blue refl < Blue_Thresh –> filter clouds) refl expected between 0 and 10000
NIR_Thresh	numeric. NIR threshold applied to produce a mask (select pixels with NIR refl < NIR_Thresh) refl expected between 0 and 10000
Blue	numeric. spectral band corresponding to the blue channel (in nanometers)
Red	numeric. spectral band corresponding to the red channel (in nanometers)
NIR	numeric. spectral band corresponding to the NIR channel (in nanometers)

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