AIRS LEVEL 1B INFRARED 22 10/10/2002 AIRS LEVEL 1B PGE STATUS - - PowerPoint PPT Presentation

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AIRS LEVEL 1B INFRARED 22 10/10/2002 AIRS LEVEL 1B PGE STATUS - - PowerPoint PPT Presentation

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AIRS LEVEL 1B INFRARED 22 10/10/2002 AIRS LEVEL 1B PGE STATUS RADIANCES Current Version in Baseline: v2.6.7.3 Radiances Gains averaged over all scans in a granule, then applied to each scan Offsets are median of 8 space views

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SLIDE 1

10/10/2002

22

AIRS LEVEL 1B INFRARED

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SLIDE 2

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AIRS LEVEL 1B PGE STATUS RADIANCES

  • Current Version in Baseline: v2.6.7.3
  • Radiances
  • Gains averaged over all scans in a granule, then applied to

each scan

  • Offsets are median of 8 space views from each scan
  • Calibration Coefficients per IEEE paper to be published

(Available upon request)

  • No change to radiances planned at this time
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SLIDE 3

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AIRS LEVEL 1B PGE STATUS QA DATA

  • L1B QA Updates:
  • All Calibration Flags working
  • “nominal_freq” is valid frequencies
  • New definition of NEN in place
  • Updated L1B counts limits
  • Updated Pop Detection Algorithm. Still in check.
  • Updated AutomaticQAFlag Definition
  • Pending Activities
  • Update Limits for…
  • Pop Detection
  • NEN
  • Lunar Detection Flags
  • L1B Final by L+7 (December)
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SLIDE 4

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PROCESS IN PLACE FOR DETECTION OF OUT-OF-LIMIT CONDITIONS OF CHANNELS

Apply the following algorithm on every channel to determine if footprint is useable:

Use Footprint Dynamic (in L1B Files) Static: (Channel Properties File) Cal Flag (L1B QA) Bit 1: Telemetry Bit 4: Pop Detected Bit 5: Bad Gain Bit 6: Bad Offset CalChanSummary (L1B QA) Bit 3: High Noise Undesireable Property? L1B Radiance is Bad Float (-9999) No No Yes Discard Granule Discard Scan Discard Footprint Discard Channel No No Yes Yes Yes

Science Team Participation Requested for setting Limits for Noise and Pops

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SLIDE 5

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WHAT SHOULD LIMIT BE ON “POPS”?

(x NEN)

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SLIDE 6

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WHAT SHOULD LIMIT BE ON NEN?

NEN Limit (+/- NEN)

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SLIDE 7

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SUMMARY AND CONCLUSIONS

  • Project on track
  • Icing will require defrost within the next two months.

Expect approximately 1 week to recover

  • Instrument gains and radiation circumvention levels
  • ptimized
  • Instrument performance looks very good
  • PGE Radiances look good. No changes expected in near

term

  • PGE QA is working. Process for flagging events in place
  • QA limits need work. Particularly Pops and NEN
  • Expect to be completed with L1B by due date in Oct/Nov