1st post launchSCIAMACHY calibration & Verification

MeetingL1b

Astrium Friedrichshafen – Germany24 July 2002

First Level 1b General Product Quality analysis

2

Level 1b General Product Quality analysis: content

Related Verification Tasks Analysis specifics First results on Validation Tasks analysed Conclusions

3

Related Verification Tasks

L1.03.01: State corner coordinates L1.03.02: Pixel coordinates and viewing geometry L1.14.01: Wavelength calibration differences monitoring L1.14.02: Leakage Current from Limb - monitoring L1.14.03: Sun glint region flag - monitoring L1.14.04: Rainbow region flag - monitoring L1.14.05: SAA region flag - monitoring • L1.14.06: Rainbow flag - MDS data • L1.14.07: Saturation flag - MDS data L1.15.01: Check the consistent usage of timestamps in level

1b product

4

Analysis specifics

Level 1b product: SCI_NL__1PNPDK20020701_045922_000012452007_00191_01748_0354.N1

Orbits: 1748Timeline: T/L ID= 50 States: 19 States, Limb/Nadir

sequence

5

State corner coordinates Pixel coordinates and viewing geometry

The level 0/1b processor determines geo-location of measurement data:it needs to be verified that pixel coordinates are consistent with state corners and the viewing geometries are plausible.

 

6

Wavelength calibration differences monitoring

An alternative spectral calibration is based on known Fraunhofer lines out of the atmospheric spectrum: analysis of the mean wavelength difference of these lines compared to the calibration parameters yields information about the stability of the spectral calibration.

Orbit 1748

Wavelength cal difference mornitoring

-1.8

-1.6

-1.4

-1.2

-1.0

-0.8

-0.6

-0.4

-0.2

0.0

0.2

0.5 0.55 0.6 0.65 0.7 0.75 0.8 0.85 0.9 0.95 1

Orbit Phase

mean_w

avle

n_diff

[nm

]

Ch 1 Ch 2 Ch 3 Ch 4 Ch 5

Wavelength cal difference mornitoring

-5.0

-4.0

-3.0

-2.0

-1.0

0.0

1.0

2.0

3.0

4.0

5.0

0.5 0.55 0.6 0.65 0.7 0.75 0.8 0.85 0.9 0.95 1

Orbit Phase

mean_w

avle

n_diff

[nm

]

Ch 6 Ch 7 Ch 8

7

Leakage Current from Limb - monitoring

For the Limb states, the leakage current is determined also from the last limb elevation step, where the instrument points into dark space: analysis of the average difference between nominal state analysis and limb above atmosphere yields information about the stability of the leakage current calibration. LeakageCurrent Limb monitoring

-5300

-4800

-4300

-3800

-3300

-2800

0.55 0.6 0.65 0.7 0.75 0.8 0.85Orbit Phase

mea

n_d

iff_l

eak [%

]

Ch 8 Ch 7

Orbit 1748

2.4867E+00 PMD 1

2.6606E+00 PMD 2

2.7279E+00 PMD 3

2.0741E+00 PMD 4

1.6842E+00 PMD 5

1.3236E+00 PMD 6

2.1986E+00 PMD 7

1.6323E-02 Ch 1

2.0079E-02 Ch 2

1.8897E-02 Ch 3

1.7904E-01 Ch 4

9.1643E-02 Ch 5

2.4809E-02 Ch 6

8.3707E+00 Ch 7

9.1600E-02 Ch 8

LeakageCurrent Limb monitoring

0

0.1

0.2

0.3

0.4

0.5

0.55 0.6 0.65 0.7 0.75 0.8 0.85Orbit Phase

mea

n_d

iff_l

eak [%

]

Ch 1 Ch 2 Ch 3 Ch 4 Ch 5 Ch 6

Leakage Current Limb monitoring

-2

0

2

4

6

8

10

12

14

16

18

0.55 0.6 0.65 0.7 0.75 0.8 0.85Orbit Phase

mean_diff

_le

ak [%

]

PMD 1 PMD 2 PMD 3 PMD 4 PMD 5 PMD 6 PMD 7

8

Sun glint region flag - monitoring

Sun glint phenomenon invalidates the calculation of air mass factors in the level 1b to 2 processing.

The meaning of this flag is: 0=no sun glint danger, 1=sun glint danger.

Orbit 1748

9

Rainbow region flag - monitoring

Rainbow phenomenon, above water clouds, yields high polarisation which may invalidate some of the assumptions made in the interpolation of fractional polarisation parameters.

The meaning of this flag is: 0= no Rainbow, 1= Rainbow.

Orbit 1748

10

SAA region flag - monitoring

In case one of the calibration measurements are within the South Atlantic Anomaly, the whole state is skip for processing.

The meaning of this flag is: 0= no in the SAA region, 1= within the SAA region.

Orbit 1748

11

Consistent usage of time-stamps: Nadir (1)

Time-stamps in ADS and MDS have to be consistent, as data sets might refer to each other: consistency of Start_time for NADIR MDS, orbit 1748.State

Index

Measurement

category

Number of

DSRs for the

state

Extracted start time of scan

phase for the NADIR state from

NADIR MDS

Start time of scan phase of

the state from STATES ADS

Verification of

the Time

Stamp within: 0:00:00.001

1 1 65 4:59:22.083 4:59:22.0832 2 35 NO NADIR MEASUREMENT 5:00:30.6383 1 65 5:01:33.259 5:01:33.2594 2 35 NO NADIR MEASUREMENT 5:02:41.8215 1 65 5:03:44.442 5:03:44.4426 2 35 NO NADIR MEASUREMENT 5:04:52.9977 1 65 5:05:55.618 5:05:55.6188 2 35 NO NADIR MEASUREMENT 5:07:04.1819 1 65 5:08:06.802 5:08:06.80210 2 35 NO NADIR MEASUREMENT 5:09:15.35711 1 65 5:10:17.982 5:10:17.98212 2 35 NO NADIR MEASUREMENT 5:11:26.54013 1 65 5:12:29.161 5:12:29.16114 2 35 NO NADIR MEASUREMENT 5:13:37.72015 1 65 5:14:40.337 5:14:40.33716 2 35 NO NADIR MEASUREMENT 5:15:48.89917 1 65 5:16:51.521 5:16:51.52118 2 35 NO NADIR MEASUREMENT 5:18:00.07919 1 65 5:19:02.700 5:19:02.700

Time Stamps match

Time Stamps match

Time Stamps match

Time Stamps match

Time Stamps match

Time Stamps match

Time Stamps match

Time Stamps match

Time Stamps match

Time Stamps match

12

Consistent usage of time-stamps: Nadir (2)

Time-stamps in ADS and MDS have to be consistent, as data sets might refer to each other: consistency of state duration for NADIR MDS, orbit 1748.

State

Index

Start time of scan

phase of the state

from STATES ADS

State duration from

STATES

Computed start time of the

last record of NADIR meas.

from MDS

Start time of the last record of

NADIR measurement

Verification of

Time Stamp 0:00:00.001

1 4:59:22.083 0:01:05.000 5:00:26.083 5:00:26.0832 5:00:30.638 0:00:59.000 NO NADIR MEASUREMENT NO NADIR MEASUREMENT3 5:01:33.259 0:01:05.000 5:02:37.259 5:02:37.2594 5:02:41.821 0:00:59.000 NO NADIR MEASUREMENT NO NADIR MEASUREMENT5 5:03:44.442 0:01:05.000 5:04:48.442 5:04:48.4426 5:04:52.997 0:00:59.000 NO NADIR MEASUREMENT NO NADIR MEASUREMENT7 5:05:55.618 0:01:05.000 5:06:59.618 5:06:59.6188 5:07:04.181 0:00:59.000 NO NADIR MEASUREMENT NO NADIR MEASUREMENT9 5:08:06.802 0:01:05.000 5:09:10.802 5:09:10.80210 5:09:15.357 0:00:59.000 NO NADIR MEASUREMENT NO NADIR MEASUREMENT11 5:10:17.982 0:01:05.000 5:11:21.982 5:11:21.98212 5:11:26.540 0:00:59.000 NO NADIR MEASUREMENT NO NADIR MEASUREMENT13 5:12:29.161 0:01:05.000 5:13:33.161 5:13:33.16114 5:13:37.720 0:00:59.000 NO NADIR MEASUREMENT NO NADIR MEASUREMENT15 5:14:40.337 0:01:05.000 5:15:44.337 5:15:44.33716 5:15:48.899 0:00:59.000 NO NADIR MEASUREMENT NO NADIR MEASUREMENT17 5:16:51.521 0:01:05.000 5:17:55.521 5:17:55.52118 5:18:00.079 0:00:59.000 NO NADIR MEASUREMENT NO NADIR MEASUREMENT19 5:19:02.700 0:01:05.000 5:20:06.700 5:20:06.700

Correct State duration

Correct State duration

Correct State duration

Correct State duration

Correct State duration

Correct State duration

Correct State duration

Correct State duration

Correct State duration

Correct State duration

13

Consistent usage of time-stamps: Limb (1)

Time-stamps in ADS and MDS have to be consistent, as data sets might refer to each other: consistency of Start_time for LIMB MDS, orbit 1748. State

Index

Measurement

category

Number of

DSRs

Extracted start time of scan

phase of the LIMB state from

LIMB MDS

Start time of scan

phase of the state

from STATES

Difference between Time Stamps from STATES and Time Stamps from LIMB

Verification of the

Time Stamp within: 0:00:00.200

1 1 65 NO LIMB MEASUREMENT 4:59:22.083 2 2 35 5:00:30.763 5:00:30.638 0:00:00.1253 1 65 NO LIMB MEASUREMENT 5:01:33.259 4 2 35 5:02:41.946 5:02:41.821 0:00:00.1255 1 65 NO LIMB MEASUREMENT 5:03:44.442 6 2 35 5:04:53.122 5:04:52.997 0:00:00.1257 1 65 NO LIMB MEASUREMENT 5:05:55.618 8 2 35 5:07:04.306 5:07:04.181 0:00:00.1259 1 65 NO LIMB MEASUREMENT 5:08:06.802 10 2 35 5:09:15.482 5:09:15.357 0:00:00.12511 1 65 NO LIMB MEASUREMENT 5:10:17.982 12 2 35 5:11:26.665 5:11:26.540 0:00:00.12513 1 65 NO LIMB MEASUREMENT 5:12:29.161 14 2 35 5:13:37.845 5:13:37.720 0:00:00.12515 1 65 NO LIMB MEASUREMENT 5:14:40.337 16 2 35 5:15:49.024 5:15:48.899 0:00:00.12517 1 65 NO LIMB MEASUREMENT 5:16:51.521 18 2 35 5:18:00.204 5:18:00.079 0:00:00.12519 1 65 NO LIMB MEASUREMENT 5:19:02.700

Time Stamps match

Time Stamps match

Time Stamps match

Time Stamps match

Time Stamps match

Time Stamps match

Time Stamps match

Time Stamps match

Time Stamps match

14

Consistent usage of time-stamps: Limb (2)

Time-stamps in ADS and MDS have to be consistent, as data sets might refer to each other: consistency of state duration for LIMB MDS, orbit 1748.

State

Index

Start time of scan

phase of the state

from STATES ADS

State duration from

STATES

Computed start time of the

last record of LIMB meas.

Start time of the last record of

LIMB measurement

Difference between computed Time Stamps from STATES

and Time Stamps from LIMB

Verification of

Time Stamp

within: 0:00:00.200

1 4:59:22.083 0:01:05.000 NO LIMB MEASUREMENT NO LIMB MEASUREMENT2 5:00:30.638 0:00:59.000 5:01:27.952 5:01:28.138 0:00:00.1863 5:01:33.259 0:01:05.000 NO LIMB MEASUREMENT NO LIMB MEASUREMENT4 5:02:41.821 0:00:59.000 5:03:39.136 5:03:39.321 0:00:00.1865 5:03:44.442 0:01:05.000 NO LIMB MEASUREMENT NO LIMB MEASUREMENT6 5:04:52.997 0:00:59.000 5:05:50.311 5:05:50.497 0:00:00.1867 5:05:55.618 0:01:05.000 NO LIMB MEASUREMENT NO LIMB MEASUREMENT8 5:07:04.181 0:00:59.000 5:08:01.495 5:08:01.681 0:00:00.1869 5:08:06.802 0:01:05.000 NO LIMB MEASUREMENT NO LIMB MEASUREMENT10 5:09:15.357 0:00:59.000 5:10:12.671 5:10:12.857 0:00:00.18611 5:10:17.982 0:01:05.000 NO LIMB MEASUREMENT NO LIMB MEASUREMENT12 5:11:26.540 0:00:59.000 5:12:23.854 5:12:24.040 0:00:00.18613 5:12:29.161 0:01:05.000 NO LIMB MEASUREMENT NO LIMB MEASUREMENT14 5:13:37.720 0:00:59.000 5:14:35.034 5:14:35.220 0:00:00.18615 5:14:40.337 0:01:05.000 NO LIMB MEASUREMENT NO LIMB MEASUREMENT16 5:15:48.899 0:00:59.000 5:16:46.214 5:16:46.399 0:00:00.18617 5:16:51.521 0:01:05.000 NO LIMB MEASUREMENT NO LIMB MEASUREMENT18 5:18:00.079 0:00:59.000 5:18:57.393 5:18:57.579 0:00:00.18619 5:19:02.700 0:01:05.000 NO LIMB MEASUREMENT NO LIMB MEASUREMENT

Correct State duration

Correct State duration

Correct State duration

Correct State duration

Correct State duration

Correct State duration

Correct State duration

Correct State duration

Correct State duration

15

Consistency of Level 1b

Consistency between State ID defined from the Time Line and State ID in the STATES ADS, orbit 1748.

State

Index

State ID from

Time Line 50

State ID from

STATE ADSVerification of state ID

1 6 6 State IDs match2 32 32 State IDs match3 6 6 State IDs match4 32 32 State IDs match5 6 6 State IDs match6 32 32 State IDs match7 6 6 State IDs match8 32 32 State IDs match9 6 6 State IDs match10 32 32 State IDs match11 7 7 State IDs match12 32 32 State IDs match13 7 7 State IDs match14 32 32 State IDs match15 7 7 State IDs match16 32 32 State IDs match17 7 7 State IDs match18 32 32 State IDs match19 7 7 State IDs match

16

State corner coordinates and viewing geometry: plausible Monitoring of Wavelength calibration differences: further

investigation needed Monitoring of Leakage Current from Limb: further investigation

needed Sun glint, Rainbow and SAA region flags: consistent• Rainbow and Saturation flags - MDS: to be analysed Usage of time-stamps: (almost) consistent

General Product Quality analysis: Conclusions