Module Vegetation Index (Slope Based)

Slope based vegetation indices.

Ratio Vegetation Index (Richardson and Wiegand, 1977)
RVI = R / NIR

Normalized Ratio Vegetation Index (Baret and Guyot, 1991)
NRVI = (RVI - 1) / (RVI + 1)

Normalized Difference Vegetation Index (Rouse et al. 1974)
NDVI = (NIR - R) / (NIR + R)

Transformed Vegetation Index (Deering et al., 1975)
TVI = [(NIR - R) / (NIR + R)]^0.5 + 0.5

Corrected Transformed Ratio Vegetation Index (Perry and Lautenschlager, 1984)
CTVI = [(NDVI + 0.5) / abs(NDVI + 0.5)] * [abs(NDVI + 0.5)]^0.5

Thiam's Transformed Vegetation Index (Thiam, 1997)
RVI = [abs(NDVI) + 0.5]^0.5

Soil Adjusted Vegetation Index (Huete, 1988)
SAVI = [(NIR - R) / (NIR + R)] * (1 + S)

(NIR = near infrared, R = red, S = soil adjustment factor)

References:
K.R. McCloy (2006): Resource Management Information Systems: Remote Sensing, GIS and Modelling. 2nd Edition, CRC Taylor & Francis, 575pp.

N.G. Silleos, T.K. Alexandridis, I.Z. Gitas & K. Perakis (2006): Vegetation Indices: Advances Made in Biomass Estimation and Vegetation Monitoring in the Last 30 Years, Geocarto International, 21:4, 21-28, online.

Author: V.Olaya (c) 2004, O.Conrad (c) 2011
Specification: grid
Menu: Imagery|Tools|Vegetation Indices

Parameters

	Name	Type	Identifier	Description	Constraints
Input	Red Reflectance	Grid (input)	`RED`	-	-
Input	Near Infrared Reflectance	Grid (input)	`NIR`	-	-
Output	Difference Vegetation Index (*)	Grid (optional output)	`DVI`	-	-
	Normalized Difference Vegetation Index (*)	Grid (optional output)	`NDVI`	-	-
	Ratio Vegetation Index (*)	Grid (optional output)	`RVI`	-	-
	Normalized Ratio Vegetation Index (*)	Grid (optional output)	`NRVI`	-	-
	Transformed Vegetation Index (*)	Grid (optional output)	`TVI`	-	-
	Corrected Transformed Vegetation Index (*)	Grid (optional output)	`CTVI`	-	-
	Thiam's Transformed Vegetation Index (*)	Grid (optional output)	`TTVI`	-	-
	Soil Adjusted Vegetation Index (*)	Grid (optional output)	`SAVI`	-	-
Options	Soil Adjustment Factor	Floating point	`SOIL`	Soil adjustment factor for SAVI calculation. Suggested values are 1.0 in case of very low vegetation, 0.5 for intermediate 0.5, and 0.25 for high densities (Silleos et al. 2006).	Minimum: 0.000000 Maximum: 1.000000 Default: 0.500000
(*) optional

Command-line

Usage: saga_cmd imagery_tools 1 -RED <str> -NIR <str> [-DVI <str>] [-NDVI <str>] [-RVI <str>] [-NRVI <str>] [-TVI <str>] [-CTVI <str>] [-TTVI <str>] [-SAVI <str>] [-SOIL <str>]
  -RED:<str> 	Red Reflectance
	Grid (input)
  -NIR:<str> 	Near Infrared Reflectance
	Grid (input)
  -DVI:<str> 	Difference Vegetation Index
	Grid (optional output)
  -NDVI:<str>	Normalized Difference Vegetation Index
	Grid (optional output)
  -RVI:<str> 	Ratio Vegetation Index
	Grid (optional output)
  -NRVI:<str>	Normalized Ratio Vegetation Index
	Grid (optional output)
  -TVI:<str> 	Transformed Vegetation Index
	Grid (optional output)
  -CTVI:<str>	Corrected Transformed Vegetation Index
	Grid (optional output)
  -TTVI:<str>	Thiam's Transformed Vegetation Index
	Grid (optional output)
  -SAVI:<str>	Soil Adjusted Vegetation Index
	Grid (optional output)
  -SOIL:<str>	Soil Adjustment Factor
	Floating point
	Minimum: 0.000000
	Maximum: 1.000000
	Default: 0.500000