GAMMA Interferometric Point Target Analysis Software (IPTA): Reference Manual

ccs_pt

ANSI-C program: ccs_pt.c

NAME
ccs_pt - spatial filter and reference point bias removal for point data (single record or all records)

SYNOPSIS
ccs_pt <plist> <pmask> <SLC_par> <pdata_in> <pccs> [rec_num] [type] [r_max] [w_func] [np_max]

<plist>	(input) point list (int)
<pmask>	(input) point data stack of mask values (uchar, set to - to accept all points)
<SLC_par>	(input) SLC parameter file of point list coordinates
<pint>	(input) point data stack (float or fcomplex)
<pccs>	(output) spatial interferometric correlation estimate
[rec_num]	record number in pdata_in and pdata_out to process (default -: all records)
[type]	data type (0:fcomplex 2:float, default -: fcomplex)
[r_max]	maximum radius (range samples, default: 8)
[w_func]	radial weighting function (0: 1.0 default=1: 1.0-radius/r_max)
[np_min]	minimum number of points in the corelation estimate (default = 5)

EXAMPLE
ccs_pt pt pmask0 08256.rslc.par pdiff2 pccs2 - 0 8

INSTALLATION

Source code ccs_pt.c in ./IPTA/src, executable version ccs_pt in ./IPTA/bin

DESCRIPTION
ccs_pt estimates the spatial phase coherence of point data stacks. Data can either be in fcomplex or float format. If in float format it is assumed that the data are
unwrapped phase and are converted to complex unit vectors where re = cos(phase), imagi = sin(phase). For fcomplex data the values are normalized to unit magnitude. The correlation estimate
is the magnitude of the sum of the point interferogram values within the search reach region divided by the number of points. This value varies between 0 and 1.0 and can be used as a weighting function when using the phase unwrapping program mcf_pt.

The spatial correlation can be estimated for one record or multiple records. To select all records "-" is indicated instead of a record number. If all records are filtered, the correlation data is stored in a stack with one layer for each interferogram.

<>The user can specify the radial diameter (nominally 8) of the search region around each point to search for other points to evaluate the local phase correlaton. If insufficient points are found, the correlation value for that point is set to 0. The command line parameter np_min sets the minimum number of points within the search region required to return a correlation estimate.

For estimation of the correlation the points can be weighted by either a constant or triangular wieghting, decreasing with ground distance to 0 at edge of the search
region (set via the w_func command line parameter).
</>

OPTIONS
none.

SEE ALSO

cc_wave (in the ISP documentation), cct_pt, mcf_pt.