Differential Interferometry/Geocoding (DIFF/GEO) parameter file. For structure definition see typedef_DIFF.h
NAME
DIFF_par - Parameter file (text format) used by Gamma DIFF/GEO
software containg offset location and polynomial parameters. Also
contains image subset and phase scaling parameters.
SYNOPSIS
text format parameter file
EXAMPLE and PARAMETER DEFINITIONS
The formats and definitions of the DIFF_par parameter file are
described in the following example for the file
i1_i2.DIFF_par.
| Keyword | Example | Definition |
| title | Ft. Irwin | Title, name, identification for DEM |
| initial_range_offset | 0 | initial estimate of registration offset in range between two interferograms (pixels) |
| initial_azimuth_offset | 0 | initial estimate of registration offset in azimuth between two interferograms (pixels) |
| range_samp_1 | 1629 | number of range samples of data 1 |
| az_samp_1 | 1445 | number of azimuth lines of data 1 |
| first_nonzero_range_pixel_1 | 41 | First non-zero range pixel of data 1 |
| number_of_nonzero_range_pixels_1 | 1583 | Number of non-zero range pixels of data 1 |
| range_pixel_spacing_1 | 13.324960 | range pixel spacing of image 1 (m) |
| az_pixel_spacing_1 | 20.869380 | azimuth pixel spacing of data 1 (m) |
| range_samp_2 | 1629 | number of range samples of data 2 |
| az_samp_2 | 1441 | number of azimuth lines of data 2 |
| first_nonzero_range_pixel_2 | 19 | First non-zero range pixel of data 2 |
| number_of_nonzero_range_pixels_2 | 1593 | Number of non-zero range pixels of data 2 |
| range_pixel_spacing_2 | 13.324960 | range pixel spacing of data 2 (m) |
| az_pixel_spacing_2 | 20.869380 | azimuth pixel spacing of data 2 (m) |
| offset_estimation_starting_range | 64 | starting range for automated registration offset estimation |
| offset_estimation_ending_range | 1565 | ending range for automated registration offset estimation |
| offset_estimation_range_samples | 24 | number of range samples used for automated registration offset estimation |
| offset_estimation_range_spacing | 64 | spacing of range samples used for automated registration offset estimation (pixels) |
| offset_estimation_starting_azimuth | 64 | starting azimuth for automated registration offset estimation |
| offset_estimation_ending_azimuth | 1377 | ending azimuth for automated registration offset estimation |
| offset_estimation_azimuth_samples | 21 | number of azimuth samples used for automated registration offset estimation |
| offset_estimation_azimuth_spacing | 64 | spacing of azimuth samples used for automated registration offset estimation (pixels) |
| offset_estimation_patch_width | 32 | patch width in interferogram pixels used by automated registration |
| offset_estimation_patch_height | 32 | patch height in interferogram lines used by automated registration |
| offset_estimation_threshold | 8.00 | SNR threshold to reject/accept an offset estimate during automated registration. |
| range_offset_polynomial | 0.0000 1.0000e-04 -2.0000e-04 | Range offset polynomial (constant term, linear term in range, linear term in azimuth (pixel, pixel/pixel, pixel/pixel) |
| azimuth_offset_polynomial | 0.0000 -1.0000e-04 2.0000e-04 | Azimuth offset polynomial (constant term, linear term in range, linear term in azimuth (pixel, pixel/pixel, pixel/pixel) |
| starting_azimuth_line | 0 | starting azimuth line (relative to interferogram 1) |
| map_azimuth_lines | 1141 | number of azimuth lines to use for differential processing |
| map_width: | 1629 | width of differential interferometric products |
| first_nonzero_range_pixel | 41 | first non-zero range pixel of differential interferometric products |
| number_of_nonzero_range_pixels: | 3171 | number of non-zero range pixel of differential interferometric products |
| range_looks | 1 | multi-looking in range applied in differential interferometric processing |
| azimuth_looks | 1 | multi-looking in azimuth applied in differential interferometric processing |
| diff_phase_fit | 1.43315e+02 -1.92621e-01 6.89473e-06 -5.83760e-01 7.31414e-05 2.97260e-04 | Scaling function for unwrapped interferometric phase 2 found by LS fit between unwrapped phase images 1 and 2 |
DESCRIPTION
DIFF_par contains parameter values used by the Differential
Interferometry Software DIFF. The DIFF_par file contains
information on the registration of the two interferograms used,
the data section selected and the phase scaling applied to image
2 before it is subtracted from image 1.
The DIFF_par is generated using the program create_diff_par. The user is interactively asked for the input used to describe a DEM. Different projections are supported. The parameters of DIFF_par are used by many of the programs of the DIFF. Some parameters are inserted by programs of the DIFF.
The formats used in DIFF_par are defined in the in DIFF type definition file typedef_DIFF.h.
SEE ALSO
Users Guide, typedef_ISP.h, typedef_DIFF.h, create_diff_par .