ANSI-C program: def_trans_pt.c
NAME
def_trans_pt - Surface displacement map generation from unwrapped
differential phase.
SYNOPSIS
def_trans_pt <plist> <pmask>
<pSLC_par> <pdef> <phgt> <pdef2>
[mode]
| <plist> | (input) point list (int) |
| <pmask> | (input) point data stack of mask values (uchar, set to - to accept all points) |
| <SLC_par> | (input) ISP SLC/MLI parameter file of the reference SLC image (text) |
| <pdef> | point data stack deformation rate along the line of sight (float) |
| <phgt> | (input) point data stack of terrain heights (float) (enter - for none) |
| <pdef2> | (output) equivelent vertical or horizontal deformation rate (binary) |
| <mode> | displacement calculation mode: 0: vertical, +: increasing height (m) 1: horizontal, +: decreasing ground range (m) |
EXAMPLE
def_trans_pt pt pmsk1 19960421.slc.par pdef phgt pdef_vert
1
Converts the LOS deformation rate to a vertical displacement
rate map. The point list is pt and the point mask is
pmsk1
DESCRIPTION
def_trans_pt converts
the deformation rate along the line of sight (LOS) into the
equivalent vertical or horizontal deformation rate. The nominal
units are meters/year. The basic assumption is all the
deformation is either vertical or horizontal. The observed LOS
deformation rate is the component of this vertical or horizontal
deformation along the LOS. The geometrical reference is chosen to
be reference SLC.
To determine the equivalent deformation rate in the vertical direction mode 0 is selected. For horizontal deformation rates, mode 1 is selected. Positive signs corresponding to increasing surface height and negative signs to subsidence, def_trans_pt mode 0 is selected. Vertical displacement can often be assumed in the case of subsidence.
To map the equivalent horizontal displacement rate cin the
ground range direction with a positive sign corresponding
to decreasing ground range, def_trans_pt mode 1 is selected.
Note that the mapping of displacement rate along the terrain
surface, as required in the mapping of glacier velocity, is not
supported by def_trans_pt.
OPTIONS
Terrain heights are required for the conversion of the
deformation rate to the equivalent deformation rate in the
vertical or horizontal direction. As an option the height point
data does not need to be entered and a surface reference height
0f 0.0 m is used for the conversion. The effect of the terrain
height on the result may in many cases be neglected in comparison
to other error sources.
SEE ALSO
ipta.h.