Resumen
Calculates the Perpendicular Vegetation Index (PVI) from a multiband raster object and returns a raster object with the index values.
Debate
El Índice de vegetación perpendicular (PVI) es similar a un índice diferencial de vegetación; sin embargo, es sensible a las variaciones atmosféricas. Al utilizar este método para comparar diferentes imágenes, sólo se debe utilizar en imágenes que se han corregido atmosféricamente.
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.
Sintaxis
PVI (raster, {nir_band_id}, {red_band_id}, {a}, {b})| Parámetro | Explicación | Tipo de datos |
raster | The input raster. | Raster |
nir_band_id | The band ID of the near-infrared band. The ID index uses one-based indexing. (El valor predeterminado es 4) | Integer |
red_band_id | The band ID of the red-edge band. The ID index uses one-based indexing. (El valor predeterminado es 3) | Integer |
a | The slope of the soil line. (El valor predeterminado es 0.3) | Double |
b | The gradient of the soil line. (El valor predeterminado es 0.5) | Double |
| Tipo de datos | Explicación |
| Raster | The output raster object with the PVI index values. |
Muestra de código
Calculates the Perpendicular Vegetation Index for a Landsat 8 image.
import arcpy
PVI_raster = arcpy.sa.PVI("Landsat8.tif", 5, 4, 0.3, 0.5)