1. Report of GRWG: Review of Actions & Web meetings
Special Issue of the IEEE TGRS on “Inter-Calibration of Satellite Instruments”:
Special Issue of the IEEE TGRS on “Inter-Calibration of Satellite Instruments”:
12 September 2018
Report of GRWG: Review of Actions & Web meetings
Tim Hewison

2. GSICS is about Standards

3. Not Chinese Standards

4. Or American Standards

5. GSICS is about Standards
But defining global standards
For radiometric calibration
Procedures for inter-calibration
Standards for Data Formats
Filenames, Server structures, Variable names, etc...
Internationally
by working together
in a global community of satellite operators

6. Special Issue of the IEEE TGRS on “Inter-Calibration of Satellite Instruments”
There has been a lot of interest in the community with regards to the special issue topic.
Submission deadline was January 31, 2012
later extended to February 29, 2012
The special issue submissions are now closed.
There was an overwhelming response
close to 45 manuscripts were submitted
Manuscripts undergoing normal review process
Target publication date of March 2013.
The goal of this special journal issue is to capture the state-of-the-art methodologies and results from inter-calibration of satellite instruments
including full end-to-end uncertainty analysis.
Accordingly, this special issue will become a reference anthology for the remote sensing community.

7. Items being addressed here
GDWG04_05R
Define additional datasets, such as pixel collocations, that may be place for storage on the GSICS servers.
Day 2 item
GDWG04_05R/GDWG05_38/GDWG05_42
Definition documentation for permanent storage and definition of according meta dataset./ The GRWG is required to inform the GDWG on what GSICS products are required to be archived. / Confirm that the source and intermediate data sets are not required as a pre-requisite for product validation using different ATBDs.
Day 2 items
EP06_01
GRWG to define what should be the key factors that need to be displayed in the GSICS Instrument Monitoring web sites.

8. Defining our Principles
EP11.8: GRWG, GDWG and GCC to refine the draft “GSICS principles” and submit them to the Executive Panel for endorsement.
From Draft minutes of Exec Panel 11:
Outreach actions (including web)
With reference to the feedback from the Users’ Workshop, it was felt necessary to reinforce GSICS presence on the web. A clear statement on the scope of GSICS and the GSICS principles should be delivered on the GSICS portal ( . This should be informative and not overstating the activities and outcome of GSICS.
 The proposed “principles” submitted by the GRWG Chair were found to be a very good basis. As concerns the science principles, the outcome should not be limited to the generation of FCDRs.

9. GSICS Principles Generic Principles Science Principles Traceability
to common references
through unbroken chain of comparisons
with specified uncertainty
Systematic generation of inter-calibration products
To compare and correct calibration of monitored instruments to references
For both Near-Real-Time and Re-Analysis applications
Level 1 data (SDR, radiances..)
Science Principles
Transform observations to allow comparison
Spatially, Temporally, Geometrically, Spectrally
Multiple comparisons of observations to analyse stability/variability
Generate Correction coefficients
Review and publish
Data management Principles
Free and Easy access
Through GSICS Data Servers
Community standards for
Data formats, naming
Metadata

10. GSICS General Principles
e.g.
Traceability
Reproducibility of results
Openness
Applicable to operational weather and environmental satellites of the Global Observing System (GOS) ??

11. GSICS Science Principles
Traceability
through an unbroken chain of comparisons
to a common reference
with specified uncertainty
Consistency
Applicable to all instruments in a given class
Systematic
Continuous ongoing inter-calibration over each instrument's operational lifetime
Global
applicable over the full range of observations??
Based on level 1 data
as supplied by satellite operator
To provide inter-calibration correction function
to allow users to correct original level 1 data
to generate Fundamental Climate Data Records (FCDRs)
To provide bias monitoring
to allow users to visualise any trends in the instruments' calibration ?

12. GSICS Data Principles e.g. Traceability Accessibility
Inclusion of meta data giving complete description
Accessibility
Following community standards
Data access (servers)
Data formats
Variable naming

13. Outstanding Actions EP10_11 EP10_17 GRWG06_02R
“GRWG Chair to propose to give a presentation on GSICS traceability approach to WGCV/IVOS with a view to seek feedback from WGCV/IVOS on this matter.”
Covered at QA4EO Workshop, UK, Nov 2011
EP10_17
"GRWG Chair to ensure that the GRWG is kept abreast of the progress made by WGCV/IVOS on navigation issues.“
IVOS23 Minutes: “Following discussions in a special technical session on geometric and image quality issues it was agreed that there was a desire and need for international collaboration to establish best practises leading to the formation of two new IVOS thematic focus groups: Geo/spatial Quality and Geometric Image quality. For the former Professor Denis Helder of South Dakota University agreed to take on the lead whilst the second has yet to have a confirmed lead. Specific terms action plan is now being defined” – in time for the next meeting (IVOS-24).
See Day 4 item
GRWG06_02R
“GSICS sees GRUAN as an important activity. GRWG sees the primary benefit of GRUAN data to provide validation of GSICS products on Level 2 products in the framework of groups like SCOPE-CM and in the framework of CAL-VAL activities. This will require a 3-way interaction with those groups.”
I will attend GRUAN workshop in June 2012 to discuss further.

14. GSICS Web Meetings 2011/12 Date Group Topics 2012-03-05/09 GRWG/GDWG
Annual GRWG+GDWG Meeting (in Beijing, China)
GRWG+GDWG
Preparation for annual GRWG+GDWG meeting
GRWG - T.Hewison
DCCs for Geostationary Lightning Mapper and Meteosat-HIRS inter-calibration strategy
GRWG - D.Kim
Lunar Calibration – including COMS commissioning data
Kalpana Calibration
GRWG - D.Doelling
Deep Convective Cloud Method
Users
2011 Users' Workshop
Form of GSICS Correction - diurnal cycles, offset terms and other sensitivities
GRWG - L.Sun
FY-2 IR Results - and midnight problem
GSICS - B.Iacovazzi
Instrument Event Logs
GDWG - A.Jelenak
Bias Monitoring web pages
Combining Multiple References

15. Outcome of Web Meetings
Mostly reflected in agenda for this meeting
Need method to assign & track actions from web meetings (and others!)

16. Top Level Aims – for GRWG #1
Web Meetings, Joint Working Group Meeting & Users' Workshops
Top Level Aims – for GRWG #1
Reflected-Solar Band:
Review of ATBDs
Roadmap to prototype GSICS Products – when/who…?
Reference – MODIS traceability & migration to VIIRS?
Strategy for LEO-LEO GSICS products
Statement on USGS setting up ROLO facility for GSICS
Re-Analysis Products:
Review of issues
General strategy – e.g. Reprocessing, versions

17. Top Level Aims – for GRWG #2
Web Meetings, Joint Working Group Meeting & Users' Workshops
Top Level Aims – for GRWG #2
Infrared:
Strategy for LEO-LEO GSICS Products
Delta Corrections for Multiple references:
Metop-A/IASI to Metop-B/IASI migration
Handling midnight calibration issue with AIRS+IASI
Using NWP as inter-calibration tool
Review of issues