ATI Parameter Summary for at0048
               processed with interferometric baseline laf_laa
                         Fri Sep  3 20:16:20 PDT 2004

FILESET:

Filename:    at0048.laf_laa_par
Description: This parameter summary file.  (ASCII)

Filename:    at0048.lppp
Description: Complete list of processing parms.  (ASCII)

Filename:    at0048.laf_laa_intf1x7
Description: Slant-Range Interferogram
Records:      1820 C*8 samples,     11113 lines

Filename:    at0048.laf_laa-uwScc1x7
Description: Slant-Range Correlation File
Records:      1820 R*4 samples,     11108 lines

Filename:    at0048.laf-az1x7
Description: Slant-Range Multilook Image laf
Records:      1820 R*4 samples,     11113 lines

Filename:    at0048.laa-az1x7
Description: Slant-Range Multilook Image laa
Records:      1820 R*4 samples,     11113 lines

Filename:    at0048.laf_laa-uwWrp-sc10x10
Description: Ground-Projected Velocity Map and Image
Records:     2x880 R*4 samples,      3881 lines

Filename:    at0048.laf_laa-uwScc-sc10x10
Description: Ground-Projected Correlation File and Image
Records:     2x880 R*4 samples,      1940 lines

Filename:    at0048.laf_laa-uwWrp-sc10x10-inc
Description: Ground-Projected Incidence Angle Map and Image
Records:     2x880 R*4 samples,      1940 lines
==============================================================================

 Slant-Range Projection Information:

   7985.340 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

   0.045994 seconds interferogram repeat time interval
   0.419146 meters/(seconds*radians) phase to velocity component conversion

Ground Map Projection Information:

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

 -22405.0 meters:  minimum S-coordinate in ground projected output
  21055.0 meters:  maximum S-coordinate in ground projected output
   3843.0 meters:  minimum C-coordinate in ground projected output
  12633.0 meters:  maximum C-coordinate in ground projected output

              Ground Map Coordinates
          Map Corner            Latitude Longitude
First Sample of First Record      17.724   -91.611
Last  Sample of First Record      17.368   -91.438
First Sample of Last Record       17.758   -91.536
Last  Sample of Last Record       17.402   -91.363

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.