Perl script: base_calc
NAME
base_calc - Generate baseline plot and output file with
perpendicular baselines and delta_T values
Generate interferogram table (itab) file specifying SLCs for each
interferogram
SYNOPSIS
base_calc <SLC_tab> <rslc_par>
<bperp_file> [itab]
[itab_type] [pltflg] [bperp_max] [delta_T_min]
[delta_T_max] [delta_n_max]
| <SLC_tab> | (input) two column list of resampled SLCs and SLC parameter files (including paths) (text) |
| <SLC_par> | (input) reference SLC image parameter filename (include
path) |
| <bperp_file> | (output) file containing list of bperp and delta T for
each pass relative to the ref_orbit |
| [itab] |
(output) interferogram
table relating SLCs to interferograms |
| [itab_type] | itab type (enter - for
default): 0:single reference (default) 1:all pairs) |
| [pltflg] | bperp plotting flag (enter
- for default): 0:none (default) 1: ouput plot in PNG format 2: screen output |
| [bperp_min] |
minimum magnitude of bperp
(m) (default = all, enter - for default) |
| [bperp_max] |
maximum magnitude of bperp
(m) (default = all, enter - for default) |
| [delta_T_min] |
minimum number of days
between passes (default = 0, enter - for default) |
| [delta_T_max] |
maximum number of days
between passes |
| [delta_n_max |
maximum scene number
difference between passes |
EXAMPLE
base_calc SLC_tab rslc/19960421.rslc.par
landers.bperp itab 1
Reads the SLC parameter filenames SLC_tab file, and calculates the baselines using orbit 19969421 as the reference. The values of the perpendicular baseline and the time interval are written to the file landers.bperp. A plot is generated written to the file landers.bperp.png.
base_calc SLC_tab rslc/19960421.rslc.par landers.bperp
itab_mr 1 2 1 500.0 - 140
In this case the itab
file is also created using orbit 19960421 as the reference scene.
The itab_mode has been set to 1 (all pairs) meaning that
all non-redundent pairs that meet the selection criteria (bperp
<= 500m, delta-T < 140 days) are included in the
itab_mr file. A
plot of the interferogram network is displayed on the
screen.
DESCRIPTION
base_calc is program
that calls base_orbit.c to determine the
baselines for interferogram pairs for the set of SLCs listed in
the SLC_tab file. This file
contains a two column list of SLC and SLC image parameter
files.
The itab file is a table in text format that relates the SLCs to the interferograms in the interferogram stack. Each row of the itab has 4 entries, SLC-1, SLC-2, INTF, and the switch_flag, where SLC-1, SLC-2, and INTF are record numbers in the SLC and interferogram point data stacks. The switch_flag entry on each line of the itab file is used to specify if a particular interferogram is to be considered in the further analysis. If zero is present, this particular interferogram is not considered in further analysis.
base_calc generates the itab file using the value of itab_mode and the constraints bperp_max and delta_T_max. The itab mode specifies if only a single reference is used or if list entries for all possible non-redundent pairs are to be generated . In the case were single reference mode (itab_mode = 0) then only interferograms that include the reference are written to the itab. In the case of itab_mode =1 all possible non-redundent pairs are listed that meet the bperp_max and delta_T_max criteria. If bperp_max or delta_T_max are given as a - or is not entered, then this parameter is not considered.
Plotting of the interferogram network is supported using
gnuplot. Set the pltflg command line parameter to 1 to get the
plot in PNG format or to 2 to get the plot directly on the
screen. See also the associated program script
base_plot.
SEE ALSO
SLC_tab, SLC_par, base_orbit, base_plot, itab