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Optical Models and Calibration Updates for Processing

Explore geolocation, optical models, and calibration processing updates since Oct 2005. Includes confidence flags and handling anomalies for reprocessing.

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Optical Models and Calibration Updates for Processing

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  1. Level 1.5 Processing Updates Martin Bates, RAL GIST 24 15th December, 2005

  2. Contents • Geolocation • optical models for V999 reprocessing • updates for and since Oct 2005 • Calibration Processing • fixed gains • What else do we need/want for release ? (non-GEO) • confidence flags (QF anomaly) • handling of anomalies (counting data) • ARG duplication ?

  3. Optical Models Use detector “banana” based on RGP L15G optimal fits Had been been using detector banana derived from lab PSF measurements (+ modelling) Square: 20040601 Cross: 20040722 Star: 20050115 Used in V999 reprocessing, and in nrt system from Oct 05 restart very basic: just use col 140 from one TOTAL image at midday

  4. Automated Monitoring Plots Automated shortly after Oct restart Incorporated in eng plots beginning of December Used to spot E/W, N/S bulk shifts in GEO. Crucial if relying on manual interventions to maintain level 1.5 geo quality.

  5. Column Azimuth Limb scans in July 2003: columns are evenly spaced SOL_SOE → “even” cols shifted wrt “odd” SOL_SOE noisy → column spacing noisy

  6. Column spacing (before)

  7. Column Spacing (after) CR-069 (non-parallel mirror): Implemented at Oct 29 start-up CR-070 (SOL_SOE fit): Implemented 14 Nov 11:52 CR-070 not ideal: lose any information on non-uniform column spacing

  8. October 2005 • Restart with optical model as for Dec 04 reproc • Retuned to match geolocation for Aug 17. • On start-up, needed to tune N/S by 0.75 pixels (done 03 Nov).

  9. Calibration • Running average gains implemented 20-Jul-2005 (and used in V999 reprocessing). • Minor start-up effects seen Oct 2005 • “warm” or “cold” start debate • Handling of outliers a potential issue • can be caused by anomalies (see later)

  10. What is missing from processing for release ? • Confidence Flags • NCR fixes • ARG duplication

  11. What is missing from processing for release ? • What do we absolutely need for release ? • What should we include if we can do it “quickly” • What is not important for this release ?

  12. What is missing from processing for release ? • Confidence Flags: • 0: QF Anomaly • 1: Direct Stray Light affecting image • 2: Direct Stray Light affecting gains (no gain update) • 3: Diffuse Stray Light • 4: Stray Light in black body • (5-8: Spare stray light fields) • 9: Black body temperature anomaly • 10: Detector temperature warning • 11: Detector temperature alarm • 12: Using cal history for CAL (n/a with running ave. gains) • 13: UTC time stamp errors • 14: Recent orbit manoeuvre • 15: SEVIRI off in last 6 hours • 16: Start of Line Jitter • 17: Scan Mirror Jitter (SOL_SOE, other TBD). • 18: Using out of date TSOL Jitter values

  13. Quartz Filter Anomaly

  14. SOL noise e.g. eclipse 02 Nov 2005

  15. What is missing from processing for release ? • Confidence Flags: • NCR fixes • Trap counting data (NCR-195) • Distinguish sun-glint from byte-shift data (NCR-164) • ARG duplication

  16. Trap Counting Data (NCR-195)

  17. Distinguish sunglint/byteshift data (NCR-164)

  18. What is missing from processing for release ? • Confidence Flags • NCR fixes • (L2) ARG renaming • G2_SEV1_L20L_20051210_120000_V002.hdf or • G2_SEV1_L20L_20051210_115325_V001.hdf

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