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Towards a Calibration Event Logging System

Tim Hewison for Sebastien Wagner & Rob Roebeling

EUMETSAT Working Group on Calibration Event Logging

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Background – Actions from CGMS and GSICS

Action:

Recommendation CGMS (39.12): CGMS Satellite Operators to provide regular information on satellite/ instruments events affecting calibration and establish corresponding websites. (minutes CGMS-39).

Recommendation GSICS: Satellite operators to provide "a log of satellite / instrument events" to support the identification of "spurious" events/trends in calibrated data sets.

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Recommendations from the GSICS RWG (Beijing 2012)

• Specify (user) requirements (type of events, level of information, export options, communication structure,…)

• Common agreement on event types to log;• Common agreement on event logging procedure;• Common agreement on reporting interface (web based data

base);• Actions to improve traceability and uniformity among satellite

operators;• Recommendation: to provide most information through the meta data.

Event log provides reference information? (redundant information is no problem)

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Current activities at EUMETSAT

• Set up of a Calibrations Events (CE) Working Group to address CGMS and GSICS recommendations

• Aims:

• Assessing the existing event logging systems at EUMETSAT.

• Collecting requirements for calibration event logging from the users (internally and externally).

• Participating in the verification of approaches for logging calibration events.

• Supporting the definition of necessary changes for building a uniform approach (across missions and also agencies) for logging calibration events.

• Supporting the definition of necessary changes for populating a database with historic events from EUMETSAT’s geostationary and polar orbiting satellites.

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Event logging databases

GEO

LEO

Assessment of the current event logging systems at EUMETSAT

GEO

LEO

Third-party programs

Calibration Event logging database

?

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Event logging databases

GEO

LEO

Assessment of the current event logging systems at EUMETSAT

GEO

LEO

Third-party programs

Calibration Event logging database

?

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Event logging databases

GEO

LEO

Assessment of the current event logging systems at EUMETSAT

GEO

LEO

Third-party programs

Common database interface (TBD)

Front end = access point (TBD)

(Real / virtual calibration event log database)

Users

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Issues

• Various event log databases

• Various ways of reporting on events

• Absence of bridges between the databases, or common approaches

• Difficulties to access the information

• Level of accessibility to external world (restricted info?)

• Availability of the information: past / present / future events: Past : not always available on computer systems (papers,

human knowledge, etc.) need for integrating this info Present: current reporting not homogeneous across

platforms / instruments / agencies Future: more missions, more synergies, more inter-

calibrations even more needs for reporting events affecting calibration

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Way forward...

• User consultation for collecting requirements on the information to be gathered and on the way to access it:

• Internally on-going at EUMETSAT• To be increased with other agencies

• Definition of a set of event categories to classify events affecting the calibration (internally on-going at EUMETSAT)

• Definition of a list of events to be reported in the database, in the set of categories:

• Agreement to be found on the baseline (= common list for all agencies)

• Agreement on the way to report these events (= support from GSICS or CGMS needed to create a bureau to define standards in event naming/reporting)

• Recommendation to satellite operators to secure the availability and the access of the information stored in the database (database records + all potential links [e.g. URLs] provided by the database)

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Way forward... Defining a classification

Sub CAT 1 Sub CAT 2

CAT 1

Sub CAT I

Sub CAT 1 Sub CAT 2

CAT 2

Sub CAT J

Sub CAT 1 Sub CAT 2

CAT N

Sub CAT K

• Make the navigation of the database by the user easier

• Limit the risk of misclassification by providing various levels of categorization

• Tag each event as belonging to one or more categories / sub-categories

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Way forward...

• Proposal 1:1. Establish a list of high level categories for the events

affecting calibration2. For each category, get a list of events to be reported from the

instrument engineers and scientists to be considered as examples for events to report.

3. Review of the categories and lists by the GSICS members4. Definition of a baseline for all GSICS members

• Proposal 2: GSICS Research Working Group to act as a naming bureau to “standardize” calibration event description

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Thank You