Multilook (Image Analyst Tools)

Summary

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

Usage

In the Geoprocessing pane, this tool 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 an output coherence product.

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
Polarization Bands (Optional)	The polarization bands that will be corrected. The first band is selected by default. Select all polarization bands if the output will be with the SAR Analysis tools.	String
Range Looks (Optional)	The integer number of looks in the range direction. If no value is provided, the minimum number of looks required to create an approximate square pixel will be used.	Long
Azimuth Looks (Optional)	The integer number of looks in the azimuth direction. If no value is provided, the minimum number of looks required to create an approximate square pixel will be used.	Long

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
polarization_bands [polarization_bands,...] (Optional)	The polarization bands that will be corrected. The first band is selected by default. Select all polarization bands if the output will be with the SAR Analysis tools.	String
range_looks (Optional)	The integer number of looks in the range direction. If no value is provided, the minimum number of looks required to create an approximate square pixel will be used.	Long
azimuth_looks (Optional)	The integer number of looks in the azimuth direction. If no value is provided, the minimum number of looks required to create an approximate square pixel will be used.	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 = r"C:\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
import arcpy
from arcpy.ia import *

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

# Run
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