Resumen
Calculates the Visible Atmospherically Resistant Index (VARI) from a multiband raster object and returns a raster object with the index values.
Debate
El método Índice de resistencia atmosféricamente visible (VARI, por sus siglas en inglés) 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 |
Tipo de datos | Explicación |
Raster | The output raster with the VARI values. |
Muestra de código
Calculates the Visible Atmospherically Resistant Index for a Landsat 8 image.
import arcpy
VARI_raster = arcpy.ia.VARI("Landsat8.tif",4,3,2)