i.vi.mpi - GRASS GIS manual

Note: This document is for an older version of GRASS GIS that will be discontinued soon. You should upgrade, and read the current manual page.

NAME

i.vi.mpi - Calculates different types of vegetation indices (mpi)
13 types of vegetation indices from red and nir,and only some requiring additional bands

KEYWORDS

vegetation index, biophysical parameters

SYNOPSIS

i.vi.mpi

i.vi.mpi --help

i.vi.mpi viname=string red=name nir=name [green=name] [blue=name] [chan5=name] [chan7=name] [tmp=integer] output=name [--overwrite] [--help] [--verbose] [--quiet] [--ui]

Flags:

--overwrite: Allow output files to overwrite existing files
--help: Print usage summary
--verbose: Verbose module output
--quiet: Quiet module output
--ui: Force launching GUI dialog

Parameters:

viname=string [required]: Name of VI; Options: dvi, evi, gvi, gari, gemi, ipvi, msavi, msavi2, ndvi, pvi, savi, sr, vari, wdvi; Default: ndvi; dvi: Difference Vegetation Index; evi: Enhanced Vegetation Index; gvi: Green Vegetation Index; gari: Green atmospherically resistant vegetation index; gemi: Global Environmental Monitoring Index; ipvi: Infrared Percentage Vegetation Index; msavi: Modified Soil Adjusted Vegetation Index; msavi2: second Modified Soil Adjusted Vegetation Index; ndvi: Normalized Difference Vegetation Index; pvi: Perpendicular Vegetation Index; savi: Soil Adjusted Vegetation Index; sr: Simple Ratio; vari: Visible Atmospherically Resistant Index; wdvi: Weighted Difference Vegetation Index
red=name [required]: Name of the RED Channel surface reflectance map [0.0;1.0]; Range: [0.0;1.0]
nir=name [required]: Name of the NIR Channel surface reflectance map [0.0;1.0]; Range: [0.0;1.0]
green=name: Name of the GREEN Channel surface reflectance map [0.0;1.0]; Range: [0.0;1.0]
blue=name: Name of the BLUE Channel surface reflectance map [0.0;1.0]; Range: [0.0;1.0]
chan5=name: Name of the CHAN5 Channel surface reflectance map [0.0;1.0]; Range: [0.0;1.0]
chan7=name: Name of the CHAN7 Channel surface reflectance map [0.0;1.0]; Range: [0.0;1.0]
tmp=integer: User input for number of operation
output=name [required]: Name of the output vi layer; Name for output raster map

DESCRIPTION
Description
NOTES
TODO
SEE ALSO
AUTHOR

DESCRIPTION

i.vi calculates vegetation indices based on biophysical parameters.

RVI: ratio vegetation index:
NDVI: Normalized Difference Vegetation Index
IPVI: Infrared Percentage Vegetation Index
DVI: Difference Vegetation Index
PVI: Perpendicular Vegetation Index
WDVI: Weighted Difference Vegetation Index
SAVI: Soil Adjusted Vegetation Index
GARI: Green atmospherically resistant vegetation index
MSAVI: Modified Soil Adjusted Vegetation Index
MSAVI2: second Modified Soil Adjusted Vegetation Index
GEMI: Global Environmental Monitoring Index
ARVI: atmospherically resistant vegetation indices
GVI: Green Vegetation Index

Description

NDVI

Data Type Band Numbers ([IR, Red])
TM Bands= [4,3]
MSS Bands = [7, 5]
AVHRR Bands = [2, 1]
SPOT XS Bands = [3, 2]
AVIRIS Bands = [51, 29]
example: (AVHRR) NDVI = (channel 2 - channel 1) / (channel 2 + channel 1)

NOTES

Originally from kepler.gps.caltech.edu
A FAQ on Vegetation in Remote Sensing
Written by Terrill W. Ray
Div. of Geological and Planetary Sciences
California Institute of Technology
email: terrill@mars1.gps.caltech.edu
Snail Mail: Terrill Ray
Division of Geological and Planetary Sciences
Caltech
Mail Code 170-25
Pasadena, CA 91125

TODO

AUTHOR

GRASS Development Team.

SOURCE CODE

Available at: i.vi.mpi source code (history)

Latest change: Monday Jan 30 19:52:26 2023 in commit: cac8d9d848299297977d1315b7e90cc3f7698730