VARI

Zusammenfassung

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

Diskussion

Die Methode "Visible Atmospherically Resistant Index (VARI)" ist ein Vegetationsindex. Sie dient zur quantitativen Schätzung des Vegetationsanteils, der ausschließlich anhand des sichtbaren Anteils des Spektrums bestimmt wird.

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.

Syntax

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

The input raster.

Raster
red_band_id

The band ID of the red-edge band. The band ID index uses one-based indexing.

(Der Standardwert ist 3)

Integer
green_band_id

The band ID of the green band. The ID index uses one-based indexing.

(Der Standardwert ist 2)

Integer
blue_band_id

The band ID of the blue band. The ID index uses one-based indexing.

(Der Standardwert ist 1)

Integer
Rückgabewert
DatentypErläuterung
Raster

The output raster with the VARI values.

Codebeispiel

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)