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1 st post launch SCIAMACHY calibration & Verification Meeting L1b Astrium Friedrichshafen – Germany 24 July 2002 First Level 1b General Product Quality analysis. Level 1b General Product Quality analysis: content. Related Verification Tasks Analysis specifics - PowerPoint PPT Presentation
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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