ANSI-C program: ts_rate.c
NAME
ts_rate - Calculate
linear fit of the unwrapped-phase time-series
SYNOPSIS
ts_rate <DISP_tab> <RMLI_tab>
<itab_ts> <sigma> <rate> <const>
<sigma_ts>
| <DISP_tab> | (input) list of unwrapped phase or displacement files
in the time-series (text) |
| <RMLI_tab> | (input) list MLI images and parameter files that are
associated with the entries of the DISP_tab NOTE: the number of range and azimuth looks must match the values used for the input interferograms |
| <itab_ts> | (input) single-reference itab describing files in the
DISP_tab (text) |
| <sigma> | (input) phase sigma for interferogram in the DISP_tab (enter - for all equal) |
| <rate> | (output) phase or displacement rate/year |
| <const> | (output) phase or displacement constant |
| <sigma_ts> | (output) standard deviation of output fit relative to the input data |
EXAMPLE
ts_rate DISP_tab RMLI_tab itab_ts ts_rate ts_const
ts_sigma
Performs a linear regression of the displacement phase time
series files listed in the DISP_tab. These interferograms
correspond to the entries of the single-reference itab_ts file. The acquisition
dates for the single-reference time series are stored in
the RMLI image parameter files listed in the RMLI_tab. The output estimates
of the deformation rate in radians/year is stored in the
ts_rate file. The offset
constant of the fit is stored in the ts_const file and the standard
deviation of the phase relative to the linear fit is stored in
the ts_sigma file for
each point in the series.
DESCRIPTION
ts-rate performs a linear
regression on a time-series of phase or deformation for each
point. The output slope of the fit is the linear rate of phase or
deformation along the line of sight (LOS). The output rate is in
units of radians/year or meters/year depending if the input data
are interpreted as phase or displacement.
The constant parameter of the regression is stored in the
ts_const file and can be
interpreted as the phase or displacement for the reference
time.
The file sigma_ts is
the standard deviation of the fit with respect to the time-series
input data. Large values for sigma_ts indicate either large
non-linear deformation or atmosphere. Another possibility for
large values of sigma_ts
is that there are phase unwrapping errors in a number of the
scenes.
The DISP_tab file can be created using the mk_tab script for the stack
generated by mb.
Display of the output data can be performed using disdt_pwr24 and rasdt_pwr24.
SEE ALSO
mb, mk_tab, disdt_pwr24,
disp2ras, rasdt_pwr24