CNES Mission Center : SALP PRODUCTION STATUS

OSTST meeting, Hobart, March 12-15, 2007 N. Picot / 1

CNES Mission Center : SALP PRODUCTION STATUS


SALP operation center

• Processing, archiving, validation and distribution of orbitography and altimeter data for :– Jason-1, T/P, ENVISAT, SPOTs satellites

– Also use GFO data when available (facing several pbs late 2006 with battery management) as input of Duacs system

• Preparation of Jason-2 ground processing center : – Definition of Jason-2 products content and ground processing

chains (see Jason-2 presentation)

– Studies ongoing to refine Jason-1/Jason-2 standards

• Preparation of Alti-Ka ground processing center : – Definition of Alti-ka products content and ground processing chains

(see Alti-ka presentation)


Jason-1 altimeter products

• Shared processing effort :

– OSDR and Reprocessed GDR at JSDS

– IGDR and GDR at CNES

• Dissemination :

– OSDR+IGDR on anonymous ftp server or on user site for specific users

– GDR on anonymous ftp server and DVD

• Main 2006 milestones are :– Mission safehold (October, 30th to November 16th)– Routine production, validation and distribution to the user community :

GDR_B up to cycle 185 (dated 2007-01-13 16:40:05 to 2007-01-23 14:38:36.) Users have access to 5 years of Jason-1 GDR products (not yet homogeneous data set)

– Implementation of new CMA ground processing configuration allowing much faster processing (and prerequisite for reprocessing) mid November 2006

– GDR_B : see next


Jason-1 GDR reprocessing

• GDR_B was introduced late 2005, validated during last OSTST and in November 2006 the GDR status was

– Cycles 1-21 : Version B GDRs (Jan 2002-Aug 2002)– Cycles 22-127 : Version A GDRs (Aug 2002-Jun 2005)– Cycles 128 onwards : Version B GDRs (Jun 2005)

• This mix of data (Version A versus Version B products) results with discontinuities to the Jason-1 time impacting some user applications :

– Following users requirement, it was decided to reprocess the whole set of Jason-1 GDR cycles in GDR_B

– Start of GDR_B (cycles 22 – 127) reprocessing early December 2006

• In order to have the longest continuous Version B GDR time series available at the Hobart SWT meeting, reprocessing has started with data from 2005 (cycles 110-127), then 2004 (cycles 73-109), 2003 (cycles 36-73), and finally 2002 (cycles 22-35).

• This reprocessing is performed by JSDS, SALP being involved in orbit and Mog2D computation, and cyclic validation and user dissemination

• Currently cycles 67, 70, 73-77, 79-87, 92, and 95-127 have been reprocessed and delivered (about 50% completed)

• We expect to complete this reprocessing in a few weeks.


IGDR processing

• Interim Geophysical Data Record :– Keys inputs : Doris MOE file and Meteorological files (analyzed fields)

– Requirement = IGDR shall be delivered within 3 to 5 days

– IGDR processed on CNES side

– In a nominal scenario, processing performed in less than 3 days :• processing of data dated J on day J+2

– ie data dated today March 12th will be processed on Wednesday• Verification step• production setup in follow if data quality meet requirements

Délai de livraison des IGDRs Jason

0,001,002,003,004,005,006,007,008,009,00

10,00

Date

Déla

i en

jo

urs


IGDR production monitoring

• Oct 30th Nov 16th : no IGDR production as a consequence of the platform incident

Year In less than 3 days

Overall Availability

2003 (9 months)

94 % 98 %(5 days missing)

2004 90 % 97 %(8 days missing)

2005 94 % 98 %(7 days missing)

2006 94 % 96 %(17 days missing)

0

10

20

30

40

50

60

70

80

90

100

janv-06

févr-06

mars-06

avr-06

mai-06

juin-06

juil-06

août-06

sept-06

oct-06

nov-06

déc-06

In less than 3 days Monthly global coverage


GDR processing

• Geophysical Data Record : – Keys inputs : POE file

– Processing requirement = GDR shall be delivered within 30 days and shall contain 95% of all possible over-ocean data during any 12 months period with no systematic gaps.

– Fully validated product including a systematic analysis on CNES and JPL side before data release


GDR production monitoring

Délai de mise à disposition des GDRs JASON

020406080

100120140160

100 120 140 160 180 200

Numéro de cycle

Eca

rt d

ate

de

trai

tem

ent/

dat

e d

e fi

n d

e cy

cle


ENVISAT altimeter products

• SALP involvement :

– IGDR and GDR at CNES

• Main 2006 milestones are :– A major instrumental anomaly impacted Ra2 data the USO

anomaly in February 2006.

– On May, 15th 2006, the instrument sub-system Radio Frequency Module (RFM) was switched to its B-side. Unfortunately, an anomaly occurred on the S-Band transmission power.

– On June, 20th the RFM was then switched to its nominal configuration side (A-side). A ground segment correction was developed and implemented in August and allowed Envisat altimetric data to recover its nominal quality.

– Ongoing study to generate IGDR in 2 days


ENVISAT IGDR products

%IGDR over the month

0.0010.0020.0030.0040.0050.0060.0070.0080.0090.00

100.00ja

nv-

06

févr

-06

ma

rs-0

6

avr

-06

ma

i-0

6

juin

-06

juil-

06

ao

ût-

06

sep

t-0

6

oct

-06

no

v-0

6

dé

c-0

6

%IGDR over the month


ENVISAT GDR products

%of GDR available products over cycle

97.096.996.396.898.394.4

98.0

92.2

98.996.897.399.097.798.298.498.498.497.0

98.9

92.4

78.2

99.799.1

85.5

98.3

50.0

55.0

60.0

65.0

70.0

75.0

80.0

85.0

90.0

95.0

100.0

27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52


SALP/DUACS level3 products

• SSALTO/Duacs system (Ssalto near real time multi-mission altimeter data processing system)

– routine production :• No production delay in 2006

(production performed in less than 48 hours)

• Impacted by satellites unavailabilities – Jason-1 SafeHold in November– ENVISAT safeholds, altimeter USO

anomaly, ground processing issues– GFO undervoltage anomalies

– 2006 evolutions :• Regional products capabilities set up

in operations (Mersea, MFSSTEP)

• Daily production (started on July, 1st)

– 2007 evolutions :• NRT products (OSDR, FDGDR)


SALP/AVISO Data dissemination - User services

• All dissemination (electronic and media) monitored.• More and more electronic dissemination (GDR routinely sent on

media)• 145 new teams in 2006


SALP/AVISO Enhance service to end users : BRAT

• BRAT toolbox developed by CLS under an ESA/CNES contract• In summary, this toolbox allows to :

– handle several altimetry missions’ data products (level2 or higher coming from several data centers)

– perform advanced data processing– visualize data. and include general tutorial and use cases.

Data use case on hydrology.

Processing routine functions

Visualisation functions


CONCLUSION

• SALP processing center has met all mission requirements• Reprocessing effort in GDR_B ongoing to fulfill user expectation • Jason-2 scientific algorithms needs to be frozen late 2007 and

inline with Jason-1 :– OSTST should define the desired evolutions with regards to current

Jason-1 standards (used as the baseline for ongoing Jason-2 development).

– This will lead to GDR_C Jason-1 version and possible reprocessing using this new standard starting early 2008

CNES Mission Center : SALP PRODUCTION STATUS

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