Description Usage Arguments Details Value References Examples
varNDWI
Calculate the normalized difference water index (NDWI) from
the green and near-infrared (NIR) bands.
1 | varNDWI(green, nir)
|
green |
a |
nir |
a |
The normalized difference water index (NDWI) is a ratio between the green
and near-infrared bands of the spectrum that was developed to detect open
water areas and minimize the influence of the soil and vegetation variations
\insertCitemcfeeters1996useRGISTools. This function is used within
ls7FolderToVar
, ls8FolderToVar
,
modFolderToVar
and senFolderToVar
.
A NDWI image in raster
format.
mcfeeters1996useRGISTools
1 2 3 4 5 6 7 8 9 10 11 12 13 14 | # path to the cropped and cutted MODIS images for the region of Navarre
wdir <- system.file("ExNavarreVar", package = "RGISTools")
# list all the tif files
files.mod <- list.files(wdir, pattern="\\.tif$", recursive = TRUE, full.names = TRUE)
# print the MOD09 bands
getRGISToolsOpt("MOD09BANDS")
# select the green and NIR bands
img.mod.green <- raster(files.mod[4])
img.mod.nir <- raster(files.mod[2])
# calculate the NDWI image
img.mod.ndwi <- varNDWI(img.mod.green,img.mod.nir)
# plot the image
spplot(img.mod.ndwi,col.regions=rev(rainbow(20)))
|
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