# BAI

## 概要

Calculates the Burn Area Index (BAI) from a multiband raster object and returns a raster object with the index values.

## ディスカッション

``BAI = 1/((0.1 -RED)^2 + (0.06 - NIR)^2)``

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.

## 構文

`BAI (raster, {red_band_id}, {nir_band_id})`
 パラメーター 説明 データ タイプ raster The input raster. Raster red_band_id The band ID of the red-edge band. The ID index uses one-based indexing.(デフォルト値は次のとおりです 3) Integer nir_band_id The band ID of the near-infrared band. The ID index uses one-based indexing.(デフォルト値は次のとおりです 4) Integer

 データ タイプ 説明 Raster The output raster object with the BAI values.

## コードのサンプル

BAI example

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")``````
BAI example

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")``````

#### 関連トピック

##### 関連トピック
1. An overview of the Spatial Analyst functions