ATI Parameter Summary for at0046
processed with interferometric baseline laf_laa
Sun Aug 29 10:26:56 PDT 2004
FILESET:
Filename: at0046.laf_laa_par
Description: This parameter summary file. (ASCII)
Filename: at0046.lppp
Description: Complete list of processing parms. (ASCII)
Filename: at0046.laf_laa_intf1x7
Description: Slant-Range Interferogram
Records: 1814 C*8 samples, 11113 lines
Filename: at0046.laf_laa-uwScc1x7
Description: Slant-Range Correlation File
Records: 1814 R*4 samples, 11108 lines
Filename: at0046.laf-az1x7
Description: Slant-Range Multilook Image laf
Records: 1814 R*4 samples, 11113 lines
Filename: at0046.laa-az1x7
Description: Slant-Range Multilook Image laa
Records: 1814 R*4 samples, 11113 lines
Filename: at0046.laf_laa-uwWrp-sc10x10
Description: Ground-Projected Velocity Map and Image
Records: 2x877 R*4 samples, 3878 lines
Filename: at0046.laf_laa-uwScc-sc10x10
Description: Ground-Projected Correlation File and Image
Records: 2x877 R*4 samples, 1939 lines
Filename: at0046.laf_laa-uwWrp-sc10x10-inc
Description: Ground-Projected Incidence Angle Map and Image
Records: 2x877 R*4 samples, 1939 lines
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Slant-Range Projection Information:
7992.714 meters average platform altitude
8865.539 meters range to first slant-range sample
0.242257 meters radar wavelength
3.331027 meters sample spacing
3.897523 meters record spacing
0.045903 seconds interferogram repeat time interval
0.419976 meters/(seconds*radians) phase to velocity component conversion
Ground Map Projection Information:
10.00 meter sample (C) spacing,
10.00 meter record (S) spacing
-22102.0 meters: minimum S-coordinate in ground projected output
21468.0 meters: maximum S-coordinate in ground projected output
3812.0 meters: minimum C-coordinate in ground projected output
12572.0 meters: maximum C-coordinate in ground projected output
Ground Map Coordinates
Map Corner Latitude Longitude
First Sample of First Record 17.334 -91.546
Last Sample of First Record 17.501 -91.175
First Sample of Last Record 17.405 -91.581
Last Sample of Last Record 17.573 -91.210
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.