Zusammenfassung
Calculates the Burn Area Index (BAI) from a multiband raster object and returns a raster object with the index values.
Diskussion
Der Brandflächenindex (BAI, Burn Area Index) verwendet die Reflexionswerte im roten und infrarotnahen Teil des Spektrums, um die Bereiche des Terrains zu identifizieren, die vom Feuer betroffen sind.
BAI = 1/((0,1 -RED)^2 + (0,06 - NIR)^2)- Red = Pixelwerte vom roten Band
- NIR = Pixelwerte vom nahinfraroten Band
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
BAI (raster, {red_band_id}, {nir_band_id})| Parameter | Erläuterung | Datentyp |
raster | The input raster. | Raster |
red_band_id | The band ID of the red band. The ID index uses one-based indexing. (Der Standardwert ist 3) | Integer |
nir_band_id | The band ID of the near-infrared band. The ID index uses one-based indexing. (Der Standardwert ist 4) | Integer |
| Datentyp | Erläuterung |
| Raster | The output raster object with the BAI values. |
Codebeispiel
Calculates the Burn Area Index for a Landsat 8 image.
from arcpy.sa import *
out_bai_raster = BAI("landsat8.tif", 3, 4)
out_bai_raster.save("C:/arcpyExamples/outputs/BAI.tif")Calculates the Burn Area Index for a Landsat 8 image.
# Import system modules
import arcpy
from arcpy.sa import *
# Set the analysis environments
arcpy.env.workspace = "C:/arcpyExamples/data"
# Set the local variables
in_raster = "landsat8.tif"
# Execute BAI function
out_bai_raster = BAI(in_raster, 3, 4)
# Save the output
out_bai_raster.save("C:/arcpyExamples/outputs/BAI.tif")