4.3.3 SAR Radiometric calibration (DEPRECATED)
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 4.44, page 508
presents a summary of these parameters and the parameters keys to be used in command-line and
programming languages. Application key is SarRadiometricCalibration.
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Parameter key | Parameter type |
Parameter description |
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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 |
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Table 4.44: Parameters table for SAR Radiometric calibration (DEPRECATED).
- Input Image: Input complex image
- Output Image: Output calibrated image. This image contains the backscatter (sigmaNought)
of the input image.
- Available RAM (Mb): Available memory for processing (in MB)
- Disable Noise: Flag to disable noise. For 5.2.0 release, the noise values are only read by
TerraSARX product.
- Lookup table sigma /gamma/ beta/ DN.: Lookup table values are not available with all SAR
products. Products that provide lookup table with metadata are: Sentinel1, Radarsat2. Available
choices are:
- Use sigma nought lookup: Use Sigma nought lookup value from product metadata
- Use gamma nought lookup: Use Gamma nought lookup value from product metadata
- Use beta nought lookup: Use Beta nought lookup value from product metadata
- Use DN value lookup: Use DN value lookup value from product metadata
- Load otb application from xml file: Load otb application from xml file
- Save otb application to xml file: Save otb application to xml file
Example
To run this example in command-line, use the following:
otbcli_SarRadiometricCalibration -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 SarRadiometricCalibration application SarRadiometricCalibration = otbApplication.Registry.CreateApplication("SarRadiometricCalibration") # The following lines set all the application parameters: SarRadiometricCalibration.SetParameterString("in", "RSAT_imagery_HH.tif") SarRadiometricCalibration.SetParameterString("out", "SarRadiometricCalibration.tif") # The following line execute the application SarRadiometricCalibration.ExecuteAndWriteOutput()
Limitations
None
Authors
This application has been written by OTB-Team.