4.3.2 SAR Radiometric calibration

Perform radiometric calibration of SAR images. Following sensors are supported: TerraSAR-X, Sentinel1 and Radarsat-2.Both Single Look Complex(SLC) and detected products are supported as input.

Detailed description

The objective of SAR calibration is to provide imagery in which the pixel values can be directly related to the radar backscatter of the scene. This application allows computing Sigma Naught (Radiometric Calibration) for TerraSAR-X, Sentinel1 L1 and Radarsat-2 sensors. Metadata are automatically retrieved from image products.The application supports complex and non-complex images (SLC or detected products).

Parameters

This section describes in details the parameters available for this application. Table 4.42, page 507 presents a summary of these parameters and the parameters keys to be used in command-line and programming languages. Application key is SARCalibration.





Parameter key

Parameter type

Parameter description




in

Input image

Input Image

out

Output image

Output Image

ram

Int

Available RAM (Mb)

noise

Boolean

Disable Noise

lut

Choices

Lookup table sigma /gamma/ beta/ DN.

lut sigma

Choice

Use sigma nought lookup

lut gamma

Choice

Use gamma nought lookup

lut beta

Choice

Use beta nought lookup

lut dn

Choice

Use DN value lookup

inxml

XML input parameters file

Load otb application from xml file

outxml

XML output parameters file

Save otb application to xml file











Table 4.42: Parameters table for SAR Radiometric calibration.

Example

To run this example in command-line, use the following:

otbcli_SARCalibration -in RSAT_imagery_HH.tif -out SarRadiometricCalibration.tif

To run this example from Python, use the following code snippet:

#!/usr/bin/python 
 
# Import the otb applications package 
import otbApplication 
 
# The following line creates an instance of the SARCalibration application 
SARCalibration = otbApplication.Registry.CreateApplication("SARCalibration") 
 
# The following lines set all the application parameters: 
SARCalibration.SetParameterString("in", "RSAT_imagery_HH.tif") 
 
SARCalibration.SetParameterString("out", "SarRadiometricCalibration.tif") 
 
# The following line execute the application 
SARCalibration.ExecuteAndWriteOutput()

Limitations

None

Authors

This application has been written by OTB-Team.