ATI Parameter Summary for at0041
processed with interferometric baseline laf_laa
Fri Aug 13 20:20:43 PDT 2004
FILESET:
Filename: at0041.laf_laa_par
Description: This parameter summary file. (ASCII)
Filename: at0041.lppp
Description: Complete list of processing parms. (ASCII)
Filename: at0041.laf_laa_intf1x7
Description: Slant-Range Interferogram
Records: 2481 C*8 samples, 7019 lines
Filename: at0041.laf_laa-uwScc1x7
Description: Slant-Range Correlation File
Records: 2481 R*4 samples, 7012 lines
Filename: at0041.laf-az1x7
Description: Slant-Range Multilook Image laf
Records: 2481 R*4 samples, 7019 lines
Filename: at0041.laa-az1x7
Description: Slant-Range Multilook Image laa
Records: 2481 R*4 samples, 7019 lines
Filename: at0041.laf_laa-uwWrp-sc10x10
Description: Ground-Projected Velocity Map and Image
Records: 2x1074 R* samples, 2292 lines
Filename: at0041.laf_laa-uwScc-sc10x10
Description: Ground-Projected Correlation File and Image
Records: 2x1074 R* samples, 1146 lines
Filename: at0041.laf_laa-uwWrp-sc10x10-inc
Description: Ground-Projected Incidence Angle Map and Image
Records: 2x1074 R* samples, 1146 lines
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Slant-Range Projection Information:
8004.206 meters average platform altitude
9518.411 meters range to first slant-range sample
0.242257 meters radar wavelength
3.331027 meters sample spacing
3.897523 meters record spacing
0.045121 seconds interferogram repeat time interval
0.427254 meters/(seconds*radians) phase to velocity component conversion
Ground Map Projection Information:
10.00 meter sample (C) spacing,
10.00 meter record (S) spacing
-14111.0 meters: minimum S-coordinate in ground projected output
13739.0 meters: maximum S-coordinate in ground projected output
5135.0 meters: minimum C-coordinate in ground projected output
15865.0 meters: maximum C-coordinate in ground projected output
Ground Map Coordinates
Map Corner Latitude Longitude
First Sample of First Record 25.136 -80.273
Last Sample of First Record 24.950 -80.459
First Sample of Last Record 25.070 -80.194
Last Sample of Last Record 24.885 -80.381
Caveats:
This is the first flight season for which we are delivering ATI data.
The processor is still under development, and the calibration is not final.
The current status of the processor is that only some of the calibration
parameters have been adequately determined. In particular, there is an
arbitrary phase offset for each interferogram, and therefore an arbitrary
velocity offset in the velocity map.
There is evidence of inadequate motion measurement and compensation,
as well as interferometric phase center alignment: phase variations
along-track and a residual phase-ramp across the scene are seen in some
of the ATI data sets.
Note that phase variations over land are expected due to topography:
along-track interferometric processing makes use of an elevation reference
for motion compensation. Where this reference is not constant, there will
be motion compensation phase variations introduced. The elevation reference
is constant over the ocean surface, so this artifact is unique to the land.
There is no radiometric calibration for these data.