Multilook (Image Analyst)

Available with Image Analyst license.

Summary

Averages the input synthetic aperture radar (SAR) data by looks in range and azimuth to approximate square pixels, mitigate despeckle, and reduce SAR tool processing time.

Usage

• This tool can also be used to mitigate despeckle and reduce SAR tool processing time.

• The Geoprocessing pane includes information about the Range Looks and Azimuth Looks parameters with the estimated range and azimuth pixel spacing required to create an approximate square pixel for the Input Radar Data parameter value.

Parameters

Dialog

Label	Explanation	Data Type
Input Radar Data	The input radar data.	Raster Dataset; Raster Layer
Output Radar Data	The output multilook radar data.	Raster Dataset; Raster Layer
Polarization Bands (Optional)	The polarization bands that will be corrected. The first band is selected by default.	String
Range Looks (Optional)	The integer number of looks in the range direction. If no value is provided, the tool will use the minimum number of looks required to create an approximate square pixel.	Long
Azimuth Looks (Optional)	The integer number of looks in the azimuth direction. If no value is provided, the tool will use the minimum number of looks required to create an approximate square pixel.	Long

Python

Multilook(in_radar_data, out_radar_data, {polarization_bands}, {range_looks}, {azimuth_looks})

Name	Explanation	Data Type
in_radar_data	The input radar data.	Raster Dataset; Raster Layer
out_radar_data	The output multilook radar data.	Raster Dataset; Raster Layer
polarization_bands [polarization_bands,...] (Optional)	The polarization bands that will be corrected. The first band is selected by default.	String
range_looks (Optional)	The integer number of looks in the range direction. If no value is provided, the tool will use the minimum number of looks required to create an approximate square pixel.	Long
azimuth_looks (Optional)	The integer number of looks in the azimuth direction. If no value is provided, the tool will use the minimum number of looks required to create an approximate square pixel.	Long

Code sample

Multilook example 1 (Python window)

This example performs a multilook with HH polarization, a range look of 7, and an azimuth look of 2.

import arcpy
arcpy.env.workspace = "D:\Data\SAR\"
    
outRadar = arcpy.ia.Multilook("Spotlight_CAPELLA_C02_SP_SICD_HH_20210106050239_20210106050241", "HH", 4, 5)
outRadar.save("Spotlight_CAPELLA_C02_SP_SICD_HH_20210106050239_20210106050241_ML.crf")

Multilook example 2 (stand-alone script)

This example performs a multilook with HH polarization, a range look of 7, and an azimuth look of 2.

# Import system modules and check out ArcGIS Image Analyst extension license
import arcpy
arcpy.CheckOutExtension("ImageAnalyst")
from arcpy.ia import *

# Set local variables
in_radar="D:\Data\SAR\Spotlight_CAPELLA_C02_SP_SICD_HH_20210106050239_20210106050241_CalB0.crf"
out_radar="D:\Data\SAR\Spotlight_CAPELLA_C02_SP_SICD_HH_20210106050239_20210106050241_CalB0_ML.crf"
polarization="HH"
range_looks=4
azimuth_looks=5

# Execute 
outRadar = arcpy.ia.Multilook(in_radar, polarization, range_looks, azimuth_looks)
outRadar.save(out_radar)

Environments

Compression, Current Workspace, Geographic Transformations, NoData, Output CONFIG Keyword, Output Coordinate System, Parallel Processing Factor, Pyramid, Raster Statistics, Scratch Workspace, Snap Raster, Tile Size

Licensing information

• Basic: Requires Image Analyst
• Standard: Requires Image Analyst
• Advanced: Requires Image Analyst