# SARDecompositions

## Brief Description

From one-band complex images (each one related to an element of the Sinclair matrix), returns the selected decomposition.

## Tags

SAR

## Long Description

From one-band complex images (HH, HV, VH, VV), returns the selected decomposition. All the decompositions implemented are intended for the mono-static case (transmitter and receiver are co-located). There are two kinds of decomposition : coherent ones and incoherent ones. In the coherent case, only the Pauli decomposition is available. In the incoherent case, there the decompositions available : Huynen, Barnes, and H-alpha-A. User must provide three one-band complex images HH, HV or VH, and VV (mono-static case <=> HV = VH). Incoherent decompositions consist in averaging 3x3 complex coherency/covariance matrices; the user must provide the size of the averaging window, thanks to the parameter inco.kernelsize.

## Parameters

- [param] -inhh <string> Input image (HH). Mandatory: True. Default Value: ""
- [param] -inhv <string> Input image (HV). Mandatory: False. Default Value: ""
- [param] -invh <string> Input image (VH). Mandatory: False. Default Value: ""
- [param] -invv <string> Input image (VV). Mandatory: True. Default Value: ""
- [param] -out <string> Output image. Mandatory: True. Default Value: "0"
- [param] -inco <string> This group allows setting parameters related to the incoherent decompositions.. Mandatory: True. Default Value: "0"
- [param] -ram <int32> Available memory for processing (in MB). Mandatory: False. Default Value: "128"
- [param] -inxml <string> Load otb application from xml file. Mandatory: False. Default Value: ""
- [param] -outxml <string> Save otb application to xml file. Mandatory: False. Default Value: ""
[choice] -decomp haa,barnes,huynen,pauli. Mandatory: True. Default Value: "haa"

- [group] -haa

- [group] -barnes

- [group] -huynen

- [group] -pauli

## Limitations

Some decompositions output real images, while this application outputs complex images for general purpose. Users should pay attention to extract the real part of the results provided by this application.

## Authors

OTB-Team

## See Also

SARPolarMatrixConvert, SARPolarSynth

## Example of use

- inhh: HH.tif

- invh: VH.tif

- invv: VV.tif

- decomp: haa

- out: HaA.tif