OSCAR/Space Version 2.0 Expert system for instrument assessment and gap analysis

Transcription

1 OSCAR/Space Version 2.0 Expert system for instrument assessment and gap analysis IPET-SUP-2, February 2016 Jérôme Lafeuille (Secretariat, WMO Space Programme) WMO/OBS Space Programme Office

2 OSCAR/Space oscar.wmo.int/space On line resource supporting the WIGOS Rolling Review of Requirements Space module available since Sept visits per day, from worldwide users : space agencies, application centres, consultants, researchers, students, and feeds the WMO and CGMS websites Used as reference for reports, application planning, gap analysis, socio-economic benefit studies, frequency management, etc. IPET-SUP-2, Feb

3 Contents of OSCAR/Space Factual information on satellites and instruments with input from CGMS, ET SAT, space agencies, user feedback Satellite details (> 600 satellites) Instrument specifications (> 900 sensors incl. 260 for space weather) Instrument status and link to events and calibration pages New Expert assessment of instruments and gap analyses Mapping instruments to measured variables (relevance rated 1 to 5) «Gap analysis» by measured variable or by type of misssion IPET-SUP-2, Feb

4 (1) Factual information content Name, purpose Agency Programme Satellite Mass, power Orbit (type, alt, ECT, lon) Launch date, end date, status Data access, telecom frequencies Payload status Instrument status, dates Link to events and cal New Instruments Name, purpose Mass, power Type, description, scan mode Resolution FOV, coverage Status Spectral characteristics IPET-SUP-2, Feb

5 IPET SUP 2, Feb

6 IPET SUP 2, Feb

7 (2) Expert assessments: mapping instruments to variables Which variables can be measured with a given instrument? Which instruments can measure a given variable? IPET-SUP-2, Feb

8 Instrument view IPET-SUP-2, Feb

9 IPET-SUP-2, Feb

10 Measurement Timeline for Solar EUV flux IPET-SUP-2, Feb

11 Remarks on OSCAR «Gap Analysis» The instrument/measurements mapping is a critical feature Products often derived from multispectral radiance processing Different criteria (depending on applications, user/provider) OSCAR provides a short list of instruments based on expert assessment of sensor design and specifications Does not take account of actual data availability Does not consider the synergy between different instruments Not strictly a gap analysis but a useful basis for experts to perform a gap analysis. Two approaches of «Gap analysis» By geophysical variable (with reference to observing requirements) By type of mission (with reference to a target configuration) IPET-SUP-2, Feb

12 About the Gap Analysis Requirements Requirements Requirements Requirements Gap Analysis? Statement of Guidance Implementation Plan (Actions,Recom) Members Space Agencies and programmes

13 About the Gap Analysis Requirements Requirements Requirements Requirements Reference Observing System Long term GOS Vision Gap Analysis instruments Statement of Guidance Implementation Gap Analysis measurements Plan (Actions,Recom) Measured variables Members Space Agencies and programmes

14 Limitations of current sensor evaluation Principle: classes of instruments of similar design/performance Efficient when several instruments are similar Excellent results for EO instruments «Unique» instruments require a specific class Heavy to manage with high number of classes Unpractical for Space Weather sensors Rating based on implicit scientific rationale Lack of transparency (black box) IPET SUP 2, Feb

15 New instrument variable mapping principle Variable 1 Variable 2 Variable 3 Variable 4 Variable x Required instrument characteristics: Spectral bands Bandwidth No of channels Polarization Scanning mode Variable y Objective Transparent Open Maintainable Etc.. IPET-SUP-2, Feb

16 New expert system approach Define key sensor specifications to measure each variable Recorded in a set of rules constituting the «knowledge basis» Each sensor is evaluated by a compliance analysis with these spec Objective : the rules are based on remote sensing principles, they are independent of the instruments Objective : assessment based on instrument design and specifications Transparent: rules are explicit, can be submitted to external review Maintainable: rules are recorded in a list and editable Open : no limit in number or diversity of instruments IPET SUP 2, Feb

17 Examples of rules For this Variable With this type of instrument If the following conditions are true Then the relevance is Sea Surface Temperature Microwave Radiometer >=2 two-polarisations frequencies in 4-8 GHz >=1 multi-polarisation frequency in 8-12 GHz Very good Atmospheric temperature Radiooccultation Receiver for >=3 GNSS constellations has 2 antennas (fore/aft) Very good Aerosol column burden Moderate resolution optical imager >=3 channels in VIS and NIR >=2 channels in the 750 nm band multi viewing (>=8 angles) multi polarisation capability Excellent Solar wind velocity Particle detector Detects protons, in 0 10 kev, Over 2π solid angle, sun pointing Energy spectral resolution <10% Angular resolution <0.2π sr Time resolution <10 s Excellent IPET-SUP-2, Feb

18 Changes for the users Removed from the current version (Capability Review) Reference Observing Strategy and Evaluation of capability after 2020 Unified interface for the Gap Analysis Gap Analysis by variable (expert system) Gap Analysis by variable (simplified, by mission objectives) Gap Analysis by type of mission (= Capability review) Powerful search/filter and customized «gap analysis» Instruments being characterized by searchable properties Ratings based on explicit/visible rules Should allow better user uptake Possible review by science groups in their field of expertise Opens possibilities for training IPET-SUP-2, Feb

19 Development plan of OSCAR/Space V2.0 Proof of concept in ECEL To demonstrate the method Development/validation of a knowledge basis (> 2000 Rules) To record the instrument details Refine the specification of the software development for OSCAR Software development New functionalities, new user/editor interfaces Test version now available Operational software to be delivered in March (TBC) Transition to operations Beta testing phase in April May (TBC) Adjustments if necessary in June (TBC) Internal review before replacing the current version IPET-SUP-2, Feb

20 Beta testing plan Target participants: IPET SUP, ET SAT, + active OSCAR contributors (ECMWF, NOAA, DOD, EUMETSAT, MetOffice, etc.) Primary objective is to validate the overall functionality Overall feedback: look and feel, navigation, structure, filter reset Specific views (new features): Instrument list (filters) Gap Analysis by variable, by mission type, or simplified (dialogue) Instrument#x : rules, explanations, limitations, rating, mission objectives Secondary objective is to check the content accuracy Rule formulation, rating Procedure to collect feedback: Surveymonkey? IPET-SUP-2, Feb

21 Conclusions : IPET SUP is invited to See the demo Provide feedback on the development and validation plan Participate in beta testing phase Provide guidance on the possible long term collaborative evolution of OSCAR/Space IPET-SUP-2, Feb