ComputeModulusAndPhase - Compute Modulus And Phase

This application computes the modulus and the phase of a complex SAR image.

Detailed description

This application computes the modulus and the phase of a complex SAR image. The input should be a single band image with complex pixels.


This section describes in details the parameters available for this application. Table [1] presents a summary of these parameters and the parameters keys to be used in command-line and programming languages. Application key is ComputeModulusAndPhase .

[1]Table: Parameters table for Compute Modulus And Phase.
Parameter Key Parameter Name Parameter Type
in Input Image Input image
modulus Modulus Output image
phase Phase Output image
ram Available RAM (Mb) Int
inxml Load otb application from xml file XML input parameters file
outxml Save otb application to xml file XML output parameters file
  • Input Image: Input image (complex single band).
  • Modulus: Modulus of the input: sqrt(real*real + imag*imag).
  • Phase: Phase of the input: atan2(imag, real).
  • Available RAM (Mb): Available memory for processing (in MB).
  • Load otb application from xml file: Load otb application from xml file.
  • Save otb application to xml file: Save otb application to xml file.


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

otbcli_ComputeModulusAndPhase -in monobandComplexFloat.tif -modulus modulus.tif -phase phase.tif

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


# Import the otb applications package
import otbApplication

# The following line creates an instance of the ComputeModulusAndPhase application
ComputeModulusAndPhase = otbApplication.Registry.CreateApplication("ComputeModulusAndPhase")

# The following lines set all the application parameters:
ComputeModulusAndPhase.SetParameterString("in", "monobandComplexFloat.tif")

ComputeModulusAndPhase.SetParameterString("modulus", "modulus.tif")

ComputeModulusAndPhase.SetParameterString("phase", "phase.tif")

# The following line execute the application




This application has been written by Alexia Mondot ( and Mickael Savinaud (

See Also

These additional resources can be useful for further information:

SARPolarMatrixConvert, SARPolarSynth