vegInd_mspec: Calculate RGB+Nir indices

In SchoenbergA/LEGION: artifical layer computing tool

Description

computes several indices based on RGB+NIR bands

Usage

vegInd_mspec(
  mspec,
  red = NULL,
  green = NULL,
  blue = NULL,
  nir = NULL,
  indlist = "all"
)

Arguments

mspec	a RasterStack with RGB+NIR bands
red	the band/layer number of band 'red'
green	the band/layer number of band 'green'
blue	the band/layer number of band 'blue'
nir	the band/layer number of band 'Near Infrared (NIR)'
indlist	comma-separated character combinations of the desired indices. Select from "NDVI","TDVI","SR","MSR" default=all. See details

Details

available indices

• "NDVI" - Normalized Difference Vegetation Index; (nir-red)/(nir+red)

• "TDVI" - Transformed Difference Vegetation Index; sqrt(0.5+(nir-red/nir+red))

• "SR" - Simple Ratio; red/nir

• "MSR" - Modified Simple Ratio; red/((nir/red+1)**0.5)

Value

Returns a RasterStack with the selected indices

Note

notes if needed

Author(s)

Andreas Schönberg

References

The IDB Project (2020): Index Database (https://www.indexdatabase.de/)

Examples

### load data
extpath <-system.file("extdata","lau_mspec.tif",package = "LEGION")
mspec <- raster::stack(extpath)
names(mspec)<- c("blue","green","red","nir")
### compute all vegetation indizes
x <-LEGION::vegInd_mspec(mspec,3,2,1,4)
plot(x)
### select specific vegetation indices
vi <-c("NDVI","TDVI")
y <-LEGION::vegInd_mspec(mspec,3,2,1,4,indlist=vi)
plot(y)

SchoenbergA/LEGION documentation built on Jan. 31, 2021, 10:12 a.m.