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Planned Level 1.5 Processing Updates

Planned Level 1.5 Processing Updates. Martin Bates (RAL) GIST26 4 th May 2007. Planned Updates. QF Anomaly: flag using radiances, not conf flag lose scan rather than whole L15N. Stray Light Flagging Identification of Counting Data Identification of Pointing Anomalies

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Planned Level 1.5 Processing Updates

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  1. Planned Level 1.5 Processing Updates Martin Bates (RAL) GIST26 4th May 2007

  2. Planned Updates • QF Anomaly: flag using radiances, not conf flag • lose scan rather than whole L15N. • Stray Light Flagging • Identification of Counting Data • Identification of Pointing Anomalies • Geolocation: Use of axis misalignment information/mod to TSOL Jitter smoothing • Handling of corrupt data (NCRs 238,239) • no impact on science processing

  3. Now: Set confidence flag and remove from Ed01 QF Anomaly Future: flag bad scan as invalid, keep rest of product

  4. SL bar in ~ 6 L15N products/night Stray Light Flagging ~11-12 L15N products pulled/night for ~65 days/year • fix “equation of time” bug • new (narrower) time limits (lose less data) • recharacterise Apr Feb Nov Time 00:00 01:00

  5. Dummy (corrupt) data Counting Data Recovery ~ 24 hrs • Identification of Counting Data • just lose affected columns rather than whole L15N • no data to pull – saves on operator effort • no biassing of running averages – saves up to 24 hrs of data (+ lots of operator effort) SW Calibration Central pixels affected by ~ 1 Wm-2sr-1

  6. Identification of Pointing Anomalies SOL_SOE_Delay spikes (mirror events) Satellite_Spin_Period spikes (glitch in data supplied to control mechanism) Sensor swaps SOL reconfiguration

  7. SOL_SOE_Delay • just lose affected columns rather than whole NANRG • no data to pull – saves on operator effort • spikes can affect selection of space pixels and distort calibration

  8. Geolocation • New information on axis misalignments available from EUMETSAT (Oct 06). • implement if testing successful ? • sftp transfer of L0 / TsolJitter in packet • mainly an infrastructure change, but ... • ... change required to way TsolJitter values are smoothed (avoid edge effects) • minimal impact on level 1.5 GEO.

  9. Planned Updates • QF Anomaly: flag using radiances • Stray Light Flagging • Identification of Counting Data • Identification of Pointing Anomalies • Geolocation: Use of axis misalignment information/mod to TSOL Jitter smoothing • Handling of corrupt data (NCRs 238,239)

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