VARI

Resumen

Calculates the Visible Atmospherically Resistant Index (VARI) from a multiband raster object and returns a raster object with the index values.

Debate

El Índice de resistencia atmosféricamente visible (VARI) es un índice de vegetación que permite estimar cuantitativamente la fracción de vegetación solo con el rango visible del espectro.

VARI = (Green - Red) / (Green + Red – Blue)

For information about other multiband raster indexes, see the Band Arithmetic raster function.

The referenced raster dataset for the raster object is temporary. To make it permanent, you can call the raster object's save method.

Sintaxis

VARI (raster, {red_band_id}, {green_band_id}, {blue_band_id})

Parámetro	Explicación	Tipo de datos
raster	The input raster.	Raster
red_band_id	The band ID of the red-edge band. The band ID index uses one-based indexing. (El valor predeterminado es 3)	Integer
green_band_id	The band ID of the green band. The ID index uses one-based indexing. (El valor predeterminado es 2)	Integer
blue_band_id	The band ID of the blue band. The ID index uses one-based indexing. (El valor predeterminado es 1)	Integer

Valor de retorno

Tipo de datos	Explicación
Raster	The output raster with the VARI values.

Muestra de código

VARI example

Calculates the Visible Atmospherically Resistant Index for a Landsat 8 image.

import arcpy

VARI_raster = arcpy.ia.VARI("Landsat8.tif",4,3,2)