SARDecompositions¶

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

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¶

Incoherent decompositions

Input Image -inhh image Mandatory
Input image (HH)

Input Image -inhv image
Input image (HV)

Input Image -invh image
Input image (VH)

Input Image -invv image Mandatory
Input image (VV)

Output Image -out image [dtype] Mandatory
Output image

Decompositions -decomp [haa|barnes|huynen|pauli] Default value: haa

H-alpha-A incoherent decomposition
H-alpha-A incoherent decomposition
Barnes incoherent decomposition
Barnes incoherent decomposition
Huynen incoherent decomposition
Huynen incoherent decomposition
Pauli coherent decomposition
Pauli coherent decomposition

Incoherent decompositions ¶

This group allows setting parameters related to the incoherent decompositions.

Kernel size for spatial incoherent averaging -inco.kernelsize int Default value: 3
Minute (0-59)

Available RAM (MB) -ram int Default value: 256
Available memory for processing (in MB).

Examples¶

From the command-line:

otbcli_SARDecompositions -inhh HH.tif -invh VH.tif -invv VV.tif -decomp haa -out HaA.tif

From Python:

import otbApplication

app = otbApplication.Registry.CreateApplication("SARDecompositions")

app.SetParameterString("inhh", "HH.tif")
app.SetParameterString("invh", "VH.tif")
app.SetParameterString("invv", "VV.tif")
app.SetParameterString("decomp","haa")
app.SetParameterString("out", "HaA.tif")

app.ExecuteAndWriteOutput()

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.