ATI Parameter Summary for at0027
               processed with interferometric baseline laf_laa
                         Fri May  7 17:31:31 PDT 2004

FILESET:

Filename:    at0027.laf_laa_par
Description: This parameter summary file.  (ASCII)

Filename:    at0027.lppp
Description: Complete list of processing parms.  (ASCII)

Filename:    at0027.laf_laa_intf1x15
Description: Slant-Range Interferogram
Records:      2695 C*8 samples,      6276 lines

Filename:    at0027.laf_laa-uwScc1x15
Description: Slant-Range Correlation File
Records:      2695 R*4 samples,      6276 lines

Filename:    at0027.laf-az1x15
Description: Slant-Range Multilook Image laf
Records:      2695 R*4 samples,      7323 lines

Filename:    at0027.laa-az1x15
Description: Slant-Range Multilook Image laa
Records:      2695 R*4 samples,      6276 lines

Filename:    at0027.laf_laa-uwWrp-sc10x10
Description: Ground-Projected Velocity Map and Image
Records:     2x2222 R* samples,      4804 lines

Filename:    at0027.laf_laa-uwScc-sc10x10
Description: Ground-Projected Correlation File and Image
Records:     2x2222 R* samples,      2402 lines

Filename:    at0027.laf_laa-uwWrp-sc10x10-inc
Description: Ground-Projected Incidence Angle Map and Image
Records:     2x2222 R* samples,      2402 lines
==============================================================================

 Slant-Range Projection Information:

   8459.583 meters average platform altitude
   9218.618 meters range to first slant-range sample

   0.240074 meters radar wavelength

   6.662055 meters sample spacing
   8.350995 meters record spacing

   0.045556 seconds interferogram repeat time interval
   0.419364 meters/(seconds*radians) phase to velocity component conversion

Ground Map Projection Information:

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

 -30379.0 meters:  minimum S-coordinate in ground projected output
  25461.0 meters:  maximum S-coordinate in ground projected output
   3656.0 meters:  minimum C-coordinate in ground projected output
  25866.0 meters:  maximum C-coordinate in ground projected output

              Ground Map Coordinates
          Map Corner            Latitude Longitude
First Sample of First Record       6.421   116.195
Last  Sample of First Record       5.983   115.943
First Sample of Last Record        6.320   116.369
Last  Sample of Last Record        5.883   116.117

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.