Gamma LAT: Reference Manual

haalpha

ANSI-C program: haalpha.c

NAME
haalpha - Calculation of entropy, anisotropy, alpha and three eigenvalues from the Pauli decomposition of the scattering matrix.

SYNOPSIS
haalpha <pauli1> <pauli2> <pauli3> <SLC_par> <anisotropy> <alpha> <entropy> <lambda1> <lambda2> <lambda3> <MLI_par> [rlks] [azlks] [loff] [nlines]

<pauli1>	(input) SLC image with Pauli 1 (Shh + Svv) component (FCOMPLEX)
<pauli2>	(input) SLC image with Pauli 2 (Shh - Svv) component (FCOMPLEX)
<pauli3>	(input) SLC image with Pauli 3 (Shv + Svh) component (FCOMPLEX)
<SLC_par>	(output) SLC ISP image parameter file
<anisotropy>	(output) multi-look intensity image with anisotropy component (FLOAT)
<alpha>	(output) multi-look intensity image with alpha component (FLOAT)
<entropy>	(output) multi-look intensity image with entropy component (FLOAT)
<lambda1>	(output) multi-look intensity image with eigenvalue #1 (FLOAT)
<lambda2>	(output) multi-look intensity image with eigenvalue #2 (FLOAT)
<lambda1>	(output) multi-look intensity image with eigenvalue #3 (FLOAT)
<MLI_par>	(output) MLI ISP image parameter file
[rlks]	number of range looks
[azlks]	number of azimuth looks
[loff]	offset to starting range (default=0)
[nlines]	number of SLC lines to process (default=entire file)

EXAMPLE
haalpha 20090501.p1 20090501.p2 20090501.p3 20090501.slc.par 20090501.A 20090501.alpha 20090501.H 20090501.l1 20090501.l2 20090501.l3 20090501.mli.par 2 4 0 -

The program returns the anisotropy (*.A), alpha (*.alpha) and entropy (*.H) decomposition of the scattering matrix starting from the Pauli components (*.p1, *.p2 and *.p3). The program also generates the 3 eigenvalue components of the target decomposition. In this example multi-look factors of 2 and 4 have been used to obtain roughly square pixels on the ground.

DESCRIPTION
haalpha computes the entropy (H), anisotropy (A) and alpha components of the Cloude-Pottier decomposition (Cloude and Pottier, 1997), as well as the three components in terms of eigenvalues. The entropy and anisotropy images have values between 0 and 1. The image of the alpha component has values between 0 and 90 degrees. The program requires the representation of the scattering matrix in the form of the Pauli components, which can be obtained from the original dataset of full-polarimetric SLC data by applying the program lin_comb_cpx. Combination of H and A is possible with the programs product and lin_comb.

The input binary files of type FCOMPLEX. The output binary files are of type FLOAT.

SEE ALSO
typedef_ISP.h .