PVI

Summary

Calculates the Perpendicular Vegetation Index (PVI) from a multiband raster object and returns a raster object with the index values.

Discussion

The Perpendicular Vegetation Index (PVI) is similar to a difference vegetation index; however, it is sensitive to atmospheric variations. When using this method to compare different images, it should only be used on images that have been atmospherically corrected.

PVI = (NIR - a * Red - b) / (√(1 + a2))

• a—slope of the soil line

• b—gradient of the soil line

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

PVI (raster, {nir_band_id}, {red_band_id}, {a}, {b})

Parameter	Explanation	Data Type
raster	The input raster.	Raster
nir_band_id	The band ID of the near-infrared band. The ID index uses one-based indexing. (The default value is 4)	Integer
red_band_id	The band ID of the red-edge band. The ID index uses one-based indexing. (The default value is 3)	Integer
a	The slope of the soil line. (The default value is 0.3)	Double
b	The gradient of the soil line. (The default value is 0.5)	Double

Return Value

Data Type	Explanation
Raster	The output raster object with the PVI index values.

Code sample

PVI example

Calculates the Perpendicular Vegetation Index for a Landsat 8 image.

import arcpy

PVI_raster = arcpy.ia.PVI("Landsat8.tif", 5, 4, 0.3, 0.5)