1、Lessons Learned Entry: 1594Lesson Info:a71 Lesson Number: 1594a71 Lesson Date: 2005-02-10a71 Submitting Organization: LARCa71 Submitted by: Kimberly Graupnera71 Authored by: John StoughtonSubject: Data Compressibility Abstract: The data compresses poorly in the Zero Path Difference (ZPD) region beca
2、use of the large dynamic range and the large frame size of the data. Description of Driving Event: The primary GIFTS sensor is an imaging interferometer with two large area Focal Plane Arrays (FPAs). Each FPA contains over 16,000 pixels. The pixel data - in the form of electrical signals - experienc
3、es large amplitude variations as the interferometer approaches the point of ZPD. The data compresses poorly in the ZPD region because of the large dynamic range and the large frame size of the data. Near real-time compression is difficult, since the data backs up (slows down) while waiting to be com
4、pressed. Thus, the data compression scheme used for GIFTS had localized issues that were harder to resolve than a simplified approach of just taking a frame of data and compressing it. Lesson(s) Learned: Data compression is poor when approaching ZPD. Detailed modeling and analyses are needed to esta
5、blish the data buffer management and compression criteria. Recommendation(s): Further investigation and research needs to be done. Evidence of Recurrence Control Effectiveness: Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-N/ADocuments Related to Lesson: N/AMission Directorate(s): a71 ScienceAdditional Key Phrase(s): a71 Research & DevelopmentAdditional Info: Approval Info: a71 Approval Organization: LARCProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
