Level 1.5 Processing Updates

Martin Bates, RAL

GIST 24

15th December, 2005

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 ?

Optical Models

Square: 20040601

Cross: 20040722

Star: 20050115

very basic: just use col 140 from one TOTAL image at midday

Use detector “banana” based on RGP L15G optimal fits

Had been been using detector banana derived from lab PSF measurements (+ modelling)

Used in V999 reprocessing, and in nrt system from Oct 05 restart

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.

Column Azimuth

SOL_SOE → “even” cols shifted wrt “odd”

SOL_SOE noisy → column spacing noisy

Limb scans in July 2003: columns are evenly spaced

Column spacing (before)

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

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).

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)

What is missing from processing for release ?

• Confidence Flags

• NCR fixes

• ARG duplication

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 ?

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

Quartz Filter Anomaly

SOL noise

e.g. eclipse 02 Nov 2005

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

Trap Counting Data (NCR-195)

Distinguish sunglint/byteshift data (NCR-164)

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