pavi: Purified Adjusted Vegetation Index
In ASIP: Automated Satellite Image Processing

Description Usage Arguments Value Note Examples

Purified Adjusted Vegetation Index (PAVI) is a vegetation based index.

1	pavi(directory = getwd(), crop = "n", ext2crop = "none")

ext2crop, crop, directory

Same as mentioned in arvi.

Computed PAVI product

1. PAVI= (r_nir^2 - r_red^2)/(r_nir^2 + r_red^2)

where, "r_" denotes TOA reflectance band.

Other important notes are mentioned in custom.eqn.

library (raster)
library (rgdal)
# Finding the path of the sample satellite image directory.
# User may define paths directly like "/home/ur_folder" or "C:/ur_folder"
path <- system.file ("TM_sample", package = "ASIP")
shapefil <- paste0 (path, "/test.shp")
op <- pavi (directory = path, crop = "y", ext2crop = shapefil)