index_bands: Estimation of vegetation indices (Estimacao de indices de...

In ExpImage: Tool For Analysis of Images in Experiments

Estimation of vegetation indices (Estimacao de indices de vegetacao).

Description

This function create vegetation indices (Esta funcao cria indices de vegetacao).

Usage

index_bands(index="NDVI",red=NULL,green=NULL,blue=NULL,nir=NULL,
      swir=NULL,normalize=FALSE)

Arguments

index	:Vegetation index to be estimated, default="NDVI" (Indice de vegetacao a ser estimado, default="NDVI").
red	:Matrix with the red band (Matriz com a banda de vermelho).
green	:Matrix with the green band (Matriz com a banda de verde).
blue	:Matrix with the blue band (Matriz com a banda de azul).
nir	:Matrix with the nir band (Matriz com a banda nir).
swir	:Matrix with the swir band (Matriz com a banda swir).
normalize	:Logical value, if TRUE, the result will be normalized to vary between 0 and 1 (Valor logico, se for TRUE o resultado sera normatizado para variar entre 0 e 1).

Value

Return images size (Retorna o tamanho das imagens).

Author(s)

Alcinei Mistico Azevedo (Instituto de ciencias agrarias da UFMG)

See Also

gray_scale , read_image

Examples

#' ########################################################
###' Abrindo o endereco de bandas de imagens de satelite
########################################################
end1=example_image(14) #Banda de azul
end2=example_image(15) #Banda de verde
end3=example_image(16) #Banda de vermelho
end4=example_image(17) #Banda de IR
end5=example_image(18) #Banda de SWIR

########################################################
###' Abrindo bandas de imagens de satelite
########################################################
B1=read_image(end1,plot=TRUE)
B2=read_image(end2,plot=TRUE)
B3=read_image(end3,plot=TRUE)
B4=read_image(end4,plot=TRUE)
B5=read_image(end5,plot=TRUE)

########################################################
###' Juntando as bandas em uma imagem
########################################################
im=join_bands(imgs = list(B1,B2,B3,B4,B5))
tif_info(im)

##########################################################
#### Mostrando a imagem colorida
##########################################################
plot_image(im,r=3,g=2,b=1,rasterRGB = TRUE)

########################################################
###' Calculando o NDVI
########################################################
NDVI=index_bands(index="NDVI",red =im[[3]],nir = im[[4]])
plot_image(im=NDVI,col=8,axis=TRUE,title="NDVI")

########################################################
###' Calculando o NDWI
########################################################
NDWI=index_bands(index="NDWI",green =im[[2]],swir = im[[5]])
plot_image(im=NDWI,col=8,axis=TRUE,title="NDWI")

ExpImage documentation built on Jan. 6, 2023, 1:24 a.m.