ANSI-C program: hgt_map_pt.c
NAME
hgt_map_pt - estimation of terrain height and cross track ground
range from unwrapped phase (single record or all
records)
SYNOPSIS
hgt_map_pt <plist> <pmask> <pSLC_par>
<ppos> <itab> <rec_num> <punw>
<pbase> <phgt> <pgr> [ph_flag]
| <plist> | (input) point list (int) |
| <pmask> | (input) point data stack of mask values (uchar, set to - to accept all points) |
| <pSLC_par> | (input) stack of SLC/MLI parameters (binary) |
| <ppos> | (input) point data stack of interpolated point target positions (fcomplex, enter - to use plist coordinates) |
| <itab> | (input) table associating interferogram stack records
with pairs of SLC stack records (ascii) (line entries are: pSLC_rec1 pSLC_rec2 itab_rec_num switch_flag) |
| <rec_num> | record number to process (default -: all records) |
| <punw> | (input) point data stack of unwrapped interferometric phases (float) |
| <pbase> | (input/output) stack of baseline parameters (binary) |
| <phgt> | (output) point data stack of terrain heights (enter - for none: float) |
| <pgr> | (output) cross-track ground ranges on the WGS-84 ellipsoid (in slant range geometry) |
| [ph_flag] | restore range phase ramp (default=0: do not restore 1: restore) |
EXAMPLE
hgt_map_pt plist pmask pSLC_par - itab -
pbase punw phgt pgr 0
INSTALLATION
Source code hgt_map_pt.c in ./IPTA/src, executable version
hgt_map_pt in ./IPTA/bin
DESCRIPTION
hgt_map_pt reads the
phase unwrapped point interferogram phase values and the
baseline geometry and reconstructs the terrain height and cross
track position for each pixel and on an ellipsodial (WGS84) Earth
model. The unwrapped phase is a measure of the propagation path
length difference between the received signals used to generate
the interferogram. This is combined with the baseline data for
each point in the image to calculate the look vector from the
radar to the point on the ground.
The hgt_map_pt program requires the SLC parameter file of the reference image to reconstruct the interferometric DEM data. The terrain height and cross-track ground range point data layers are written into separate files. Display and generation of images of the resulting height map (in slant range geometry) and ground range values can be done using pt2data and rasdt_pwr24.
SEE ALSO
base_orbit_pt, base_par_pt, rasdt_pwr24.