offset_fit adds offset polynomials from different offset parameter files.
SYNOPSIS
offset_add <OFF_par1> <OFF_par2>
<OFF_par3>
| <OFF_par1> | (input) ISP offset/interferogram parameter file
1 |
| <OFF_par2> | (input) ISP offset/interferogram parameter file
2 |
| <OFF_par3> | (output) ISP offset/interferogram parameter file with
sums of the range and azimuth offset polynomials in OFF_par1 and OFF_par2 |
EXAMPLE
offset_add 1.off 2.off 3.off
sums individually the range and azimuth polynomial
coefficients in ISP offset parameter files 1.off and 2.off and
writes the result to 3.off.
DESCRIPTION
offset_add adds polynomial coefficeents of the range
and azimuth offset polynomials stored in OFF_par1 and OFF_par2
term by term. This is used in the refinement in the resampling of
SLCs. After an inital resampling has been performed, the offsets
are measured a second time between the resampled SLC and the
reference. A polynomial fit of these residuals is added using
offset_add to the original polynomial thereby mproving the fit.
this is most useful for images that have large relative
distortions. If these distortions are non-linear, then the
SLC_interf_map is
required.
The rest of the parameters in OFF_par3 are copied from
OFF_par1.
SEE ALSO
typedef_ISP.h, OFF_par,offset_pwr, offset_SLC,offset_pwr_tracking, offset_SLC_tracking, init_offset_orbit, init_offset, create_offset