ASF Scansar/RGPS Data Quality and Operational Processing Readiness Review,
JPL, October 22, 1998

Review Board Summary and Recommendations.

The Review Board would like to acknowledge the Processor Review Team,
as well as the ASF and JPL team, for their efforts in the work presented
and in carrying out the systematic investigation of the processing problems
encountered.  We would also like to thank Ben Holt, Verne Kaupp, and
Paul Ondrus for facilitating this review and extending invitations to
the Review Board members.

Three immediate actions:

* Fix the gain change in the processor
* Implement roll-off correction in the processor for descending passes
* Verify relative location accuracy across images

The Board recommends proceeding with operational RGPS processing once these
actions are completed and reviewed by the Science Board.

Recommendations

1.  Assess roll off for the ascending passes, and correct as required.

2.  Regular monitoring of RGPS Image Quality and Coverage are met in accordance
with the science requirements.  Put in place and follow a maintenance phase
plan for regular of performance using point targets distributed and uniform
targets and other targets.  These six are:

   * Long-term relative calibration between images (Amazon, preferred,
     and winter, multi-year sea ice data)

   * Relative calibration within an image (Amazon data)

   * Absolute location (transponders and/or corner reflectors)

   * Relative location (cross-correlation of land features between passes)

   * Repeat coverage every 3 days within the ASF mask (check data acquired
     versus data planned)

   * Repeat coverage every 6 days outside the ASF mask (check data acquired
     versus data planned)

3. Assess cost and schedule impact of the implementation of the Doppler
trending as part of the MLCC.

4. Monitor spatial resolution on an infrequent but regular basis using
transponders.

5. Establish data sets sufficient for regression testing.

6. The global applicability of the MLCC needs to be determined for every beam.

7. Cost-benefit analysis of the beam stitching (multiple PRF) algorithm
should be performed.


Review Board Members:

Satish Srivastava
Dean Mensa
Tony Freeman