ATI Parameter Summary for at0025
               processed with interferometric baseline laf_laa
                         Tue Dec 10 17:21:11 PST 2002

FILESET:

Filename:    at0025.laf_laa_par
Description: This parameter summary file.  (ASCII)

Filename:    at0025.lppp
Description: Complete list of processing parms.  (ASCII)

Filename:    at0025.laf_laa_intf1x7
Description: Slant-Range Interferogram
Records:      2485 C*8 samples,      5482 lines

Filename:    at0025.laf_laa-uwScc1x7
Description: Slant-Range Correlation File
Records:      2485 R*4 samples,      5476 lines

Filename:    at0025.laf-az1x7
Description: Slant-Range Multilook Image laf
Records:      2485 R*4 samples,      5482 lines

Filename:    at0025.laa-az1x7
Description: Slant-Range Multilook Image laa
Records:      2485 R*4 samples,      5482 lines

Filename:    at0025.laf_laa-uwWrp-sc10x10
Description: Ground-Projected Velocity Map and Image
Records:     2x1140 R* samples,      2133 lines

Filename:    at0025.laf_laa-uwScc-sc10x10
Description: Ground-Projected Correlation File and Image
Records:     2x1140 R* samples,      1066 lines

Filename:    at0025.laf_laa-uwWrp-sc10x10-inc
Description: Ground-Projected Incidence Angle Map and Image
Records:     2x1140 R* samples,      1066 lines
==============================================================================

 Slant-Range Projection Information:

   8356.633 meters average platform altitude
   9315.228 meters range to first slant-range sample

   0.242257 meters radar wavelength

   3.331027 meters sample spacing
   3.897523 meters record spacing

   0.045632 seconds interferogram repeat time interval
   0.422473 meters/(seconds*radians) phase to velocity component conversion

Ground Map Projection Information:

 10.00 meter sample (C) spacing,
 10.00 meter record (S) spacing

 -11389.0 meters:  minimum S-coordinate in ground projected output
  10601.0 meters:  maximum S-coordinate in ground projected output
   4085.0 meters:  minimum C-coordinate in ground projected output
  15475.0 meters:  maximum C-coordinate in ground projected output

              Ground Map Coordinates
          Map Corner            Latitude Longitude
First Sample of First Record       5.380   103.051
Last  Sample of First Record       5.250   103.200
First Sample of Last Record        5.458   103.118
Last  Sample of Last Record        5.327   103.268

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.