1. GRWG Report and Briefing Tim Hewison on behalf of Dohyeong Kim
Special Issue of the IEEE TGRS on “Inter-Calibration of Satellite Instruments”:
Special Issue of the IEEE TGRS on “Inter-Calibration of Satellite Instruments”:
20 September 2018
GRWG Report and Briefing Tim Hewison on behalf of Dohyeong Kim

2. Overview GRWG Chairing Deliverables Update Strategy Challenges
References & Traceability
Expansion
Consistency
User Engagement – Case Studies
GRWG Actions Review

3. GSICS Research Working Group
GRWG Chairing
GSICS Research Working Group
Chair: Dohyeong Kim
Vice-Chair: Tim Hewison
Vice-Chair: Scott Hu
UV Sub-Group
Chair: Rose Munro
VIS/NIR Sub-Group
Chair: Dave Doelling
IR Sub-Group
Chair: Tim Hewison
Microwave Sub-Group
Chair: Ralph Ferraro

4. Definition of GSICS Deliverables
20 September 2018
Definition of GSICS Deliverables
GSICS Products for users of satellite data, including calibration corrections/coefficients
GSICS Algorithms, which describe inter-calibration processes, (described by ATBD)  
GSICS Monitoring Reports, assessments  
GSICS Reference datasets, including  Solar spectrum, … 
GSICS Tools for use by inter-calibration developers, (GIRO, SBAF, …)  
GSICS recommended standards, conventions and guidelines,
GSICS User Services, information 
Pro- ducts corrections
Intercalib. Algorithms
Monitoring assessmentreports
Standards, conventions,
Software and hardware tools
Calibration references
Calibration datasets

5. Routine Generation of GSICS Products
20 September 2018
Routine Generation of GSICS Products
Decision: GSICS should aim to provide users with the most recent available calibration data
at the highest available update frequency,
allow users to decide how to apply it for their applications.
For example:
Considering calibration changes driven by long-term drift:
Users interested in long-term trends may want to apply frequent updates to the calibration corrections (expected to be smaller) to avoid large, artificial jumps in the calibration time series,
Users interested in near real-time applications may want to apply the updates less frequently (e.g. only when it exceeds a certain threshold) to avoid additional calibration noise.

6. Challenges - References
Multiple References
Merging or Single
Handling Transitions
Traceability
CLARREO/TRUTHS
The Moon
The Sun
10:35
Manik Bali
NOAA
Selecting GSICS References: IR and MW 3e
11:05
Tim Hewison
GRWG
Primary GSICS or Key Comparison References? 3f
17:05
Denis Jouglet (Remote)
CNES
Hyperspectral IR comparisons - including TANSO-FTS/2 3p
17:25
Likun Wang
NOAA
IR Reference Sensor Traceability and Uncertainty 3q
16:30
Discussion
All (+XX?)
Discussion: Migration of reference instrument 4s
18:05
Tim Hewison/Tobin
EUMETSAT
CLARREO preparations 3s
9:00
Aisheng Wu
NASA
MODIS calibration summary presentation 4a
9:20
Jack Xiong
VIIRS calibration summary presentation 4b
10:30
Tom Stone
USGS
ROLO developments & schedule 4d
10:50
Arata Okuyama
JMA
Application of GIRO to NIR bands 4e
11:10
Sebastien Wagner
EUMETSAT
Status of GIRO policy, infrastructure & inter-cal study 4f
11:30
Discussion
All
Way forward on lunar inter-calibration 4g
11:50
Fred Wu/Fangfang Yu
NOAA
Lunar surface target selections & auto-mapping 4h
16:50
Larry Flynn
UVSG
Reference Solar Irradiance Spectra 4t

7. Challenges - Expansion
New Instruments
New Channels (GEO NIR)
Sounders
Hyperspectral
High-Resolution
New Sub-Groups
Coordinate with CEOS
10:50
Arata Okuyama
JMA
Application of GIRO to NIR bands 4e
17:05
Denis Jouglet (Remote)
CNES
Hyperspectral IR comparisons - including TANSO-FTS/2 3p
13:20
Seongick Cho
KIOST
Operation and Calibration of GOCI 1j
13:40
Hiroshi Murakami
JAXA
Himawari-8 Ocean Color and Aerosol 1k
14:00
Yukio Kurihara
Himawari-8 SST 1l
14:20
Calibration activities of GCOM-C/SGLI 1m
14:40
Kei Shiomi
Calibration activities of GOSAT & GOSAT-2 1n
15:30
Takeo Tadono
JAXA
Calibration activities of ALOS/AVNIR2 PRISM 1o
15:50
Takeshi Motooka
Calibration activities of ALOS-2/PALSAR 1p
16:10
Takeshi Masaki
Calibration activities of TRMM & GPM Radars 1q
16:30
Marehito Kasahara
Calibration activities of GCOM-W/AMSR2 1r
16:50
Ralph Ferraro
NOAA
Intercalibration on ATMS and SAPHIR 1s
17:10
Shengli Wu (Remote)
CMA
Intercalibration on the FY3/MWRI 1t
17:30
Takashi Maeda
Intercalibration of AMSR2 and PMWs 1u

8. GRWG Coordination GSICS Exec Panel GSICS Coordination Center
GSICS Research Working Group
UV Sub-Group
CEOS ACC
WGCV ACSG
VIS/NIR Sub-Group
WGCV IVOS
IR Sub-Group
Microwave Sub-Group
WGCV MWSG
GPM X-CAL
GSICS Data Working Group

9. Challenges - Consistency
Between Algorithms
Merging Results
DCC/lunar
Spectral
Formats
Focus on Users
15:50
Bertrand Fougnie
CNES
Combining Methods 4q
17:10
Discussion
All (+BF+FY)
Discussion: Next method - Rayleigh v Ray-matching 4u

10. Linking the GEO ring Comparing GEO-LEO and GEO-GEO Differences
To Validate Uncertainty estimates
Ensure consistency
Generate global L2 products

11. GSICS Web Meetings 2015/16 Date Group Topics 2016-01-06
GRWG - MW Subgroup
Update on MW calibrations and standards, preparation for GRWG+GDWG Annual Meeting
GRWG+GDWG - R.Roebeling
Instrument Information Landing Pages for OSCAR
GRWG VIS/NIR
DCC - Plotting Tool Requirements, GPPA Review, Latest Ray-matching results
/09
GRWG UVSG
Joint Meeting of GRWG UV and WGCV Atmospheric Composition Sub-Groups
GRWG - MWSG
Update on micorwave sensor calibrations and plans for 2015 GSICS Users Workshop
GRWG - T.Hewison
Best Practice for Process of defining SBAF and uncertainties
GRWG - IR Sub-Group
Formation of Infrared Sub-Group of GRWG - and Reference Instruments' Requirements
GRWG-MWSG
Microwave Sub-Group Web Meeting
GRWG/GDWG
Review of Actions from 2015 Annual GRWG+GDWG Meeting

12. GSICS Web Meetings 2015/16 Date Group Topics 2016 GRWG - VIS/NIR
Joint web meeting with IVOS, ACSG on use of SBAF tool
GRWG VIS/NIR - S.Wagner
Lunar Inter-Calibration Double-difference between MODIS/VIIRS and GIRO
GRWG - T.Hewison
Scoping inter-calibration opportunities using NWP bias monitoring statistics
Identify potential topics for web meetings
Will review list on Friday morning

13. Actions on GRWG Chair Closed during 2015/16
Action Ref
Description
Assigned to
Due Date
State
GWG_13.13
GRWG Chair to set up web meeting to define Best Practice for Process of defining SBAF and uncertainties by 1 June 2013. 
TimHewison
01 Jun 2013
Closed - Web meeting 
GRWG_15.8
Tim to put Pradeep in touch with 3G activity to assess uncertainties in RAOB-Sat 
29 Feb 2016
Closed by
GRWG_15.11
EUMETSAT to circulate report on investigation of the impact of the GSICS correction on atmospheric motion vector winds and other products. 
Closed by
GRWG_15.29
Tim Hewison to propose the approach of issuing frequent GSICS corrections to the Exec Panel and Users Workshop. 
- Completed at Users Workshop
GRWG_15.64
Tim to cooperate with the GDWG to develop a version control document. 
Completed by Feb 2016: in User Guide by EUMETSAT. GDWG chair will add clarifications to explain case of bug fixes.

14. Other GRWG Actions Closed during 2015/16
Action Ref
Description
Assigned to
Due Date
State
GRWG_15.7
Fred to follow up on the availability of information on Metop/AVHRR instruments, for which NOAA is responsible-
FredWu?
29 Feb 2016
closed by to 11 May 2015: We can process Metop-B AVHRR data now. Thanks for all the relevant Metop-B nominal AVHRR information see link 
GRWG_15.10
KMA to clarify during the discussion on lunar data policy the position of KMA wrt to their data
KMA
closed
GRWG_15.48
Tim to ask ECMWF for double differencing of geostationary ring. 
TimHewison
ed Tony McNally , - see 3a

15. Actions on GRWG Chair Still Open – Transfer?
Action Ref
Description
Assigned to
Due Date
State
GRWG_14.15
GRWG Chair to investigate the possibility to form a sub-group to develop inter-calibration products based on double difference comparisons with model data (NWP/RAOB+RTM).
TimHewison
01 May 2015
CLOSE?
GRWG_14.38
Tim Hewison to provide a one-page summary GEO/LEO IR products for QA4EO? best practices showcase.
Tim, Hewison
Late
GRWG_15.2
GRWG Chair to add a meeting on NWP in the agenda of the next GSICS web meetings in 2015/2016
29 Feb 2016
Now due
- Transfer to GRWG Chair
GRWG_15.56
GRWG Chair to coordinate review by all GPRCs of requirements for inter-calibration references for GEO-LEO IR products.
Now due (3e)
EP_GRWG_16.08
GRWG to review the calibration issues in the draft input to the WMO Vision of WIGOS space-based observing system in 2040 and report to the EP.
31 Oct 2015
Late - Transfer to GRWG Chair
EP_GRWG_16.09
The GRWG Chair (or EP Chair ?) to invite the CEOS WGCV to work on a joint statement on procedures, best practices and calibration resources required to ensure consistency of data records through accurate and homogeneous calibration, as an input to the Architecture for Climate Monitoring from Space.
31 Jul 2015
EP_GRWG_16.10
All satellite operators to evaluate their requirements for GSICS resources, products and services to serve the needs of their internal users (for NRT products or climate applications such as SCOPE-CM projects): identify application areas, draft requirement indicating the characteristics of the product needed, quality criteria and delivery mode
31 Jan 2016

16. Actions on GRWG Chair Still Open – Transfer?
Action Ref
Description
Assigned to
Due Date
State
GSICS_15.1 G.2 A43.16
GSICS to work with CEOS/WGCV to: – Describe the processes to be followed to ensure consistent calibration meeting climate requirements – Describe the required infrastructure (space-based and surface-based) supporting these processes – Review the analysis of calibration-related tasks in the logical analysis of the Architecture (with a view to provide a joint input to the Architecture for Climate Monitoring from Space) and report to CGMS-44
TimHewison, KenHolmlund?
29 Feb 2016
Now due
- Transfer to GRWG Chair
GSICS_15.2 WGII/3 A43.03
GSICS to document and implement its approach to manage changes in reference instruments
TimHewison
GSICS_15.3 WGII/3 A43.01
GSICS to establish the requirements for absolute lunar calibration and prepare a white paper describing the tentative way to meet those requirements in case they go beyond those lunar calibration capabilities.
- Transfer to VIS/NIR Sub-Group Chair

17. Other GRWG Outstanding Actions
Review items in Bold
Others just as a reminder
Quick review – 10s per page!
So pay attention – look for your agency/name
If you spot one and have an update stop me!

18. Other GRWG Actions Still Open
Action Ref
Description
Assigned to
Due Date
State
GRWG_14.1
Bruce Wielicki (NASA) to investigate availability of lunar observation data from CLARREO demonstrator test flight and share these with CNES and USGS and notify CNES of future balloon flights so Pleiades observations can be synchronised.
BruceWielicki?
01 May 2015
Late
GRWG_14.4
Bertrand Fougnie to provide smoothed DCC BRDFs derived from PARASOL observations.
BertrandFougnie?
GRWG_14.7
Fangfang Yu to propose what the variables should be in the NetCDF? file to provide information on the calibration diurnal v ariation, and report to GRWG.  - Reassigned to ManikBali? in May 2014.
ManikBali
GRWG_14.8
CMA and JMA to present their analysis on GEO-GEO IR products at the next meeting.
Scott,Masaya
GRWG_14.9
CMA to present plans for developing inter-calibration products for GEO hyperspectral IR sounder.
Scott
GRWG_14.14
XingMing? Liang to report the requirement from GSICS to support MICROS.
XingMingLiang
GRWG_14.16
CMA to provide ATBD for FY-3C IR product.
CMA

19. Other GRWG Actions Still Open
Action Ref
Description
Assigned to
Due Date
State
GRWG_14.20
KMA to send products to the EUMETSAT GSICS Data and Products server until the CMA collaboration server is available.
KMA
01 May 2015
Late
GRWG_14.27
All GPRCs to review their GSICS websites to take into account of the new developments in GSICS as these websites will be reviewed in the next joint meeting.
ALL, GPRC
GRWG_14.28
IMD to update their website to provide GSICS information. This will be provided on the WMO for inclusion into their website
IMD
GRWG_14.29
Masaya Takahashi to check for a document regarding minimum content for GPRC GSICS webpage. If this document does not exist, then he shall author one and upload it to the Wiki.
MasayaTakahashi
GRWG_14.31
EUMETSAT to prepare a proposal for automating the GPPA and demonstrate this in a Webex meeting.
EUMETSAT
GRWG_14.32
Xu Na (CMA): report at the next meeting on the work done on SRF retrieval using hyperspectral instruments.
XuNa?
GRWG_15.45
CMA to report back on their investigations on SRF retrieval.
CMA
29 Feb 2016
GRWG_14.33
EUMETSAT to share with IMD plans for reprocessing of the archive data (re-calibration)
GRWG_14.35
EUMETSAT/NOAA/NASA/JMA to perform analysis to evaluate the optimal temporal resolution for a DCC product. GPRCs are invited to report at the next web-meeting on the DCC method.
EUMETSAT, NOAA, NASA, JMA
GRWG_14.39
CMA to investigate hosting a joint GSICS/CEOS-IVOS workshop to promote SI traceable measurements in orbit.

20. Other GRWG Actions Still Open
Action Ref
Description
Assigned to
Due Date
State
GRWG_14.41
KMA to investigate the feasibility of providing GSICS with its BRDF model and report.
KMA
01 May 2015
Late
GRWG_15.5
KMA to present the use BJ Sohn's DCC algorithm to build a BRDF model
29 Feb 2016
Due now
GRWG_15.21
KMA to deliver their RTM DCC BRDF model.
GRWG_15.3
IMD to report on results of investigation into suitability of Rann of Kutch as a test site for INSAT-3D calibration, following ground characterisation, and share details with GSICS by
IMD
GRWG_15.4
D. Jouglet to investigate the availability of POLO in SADE database and report to GSICS.
CNES
GRWG_15.9
JAXA to correspond with Microwave Sub-Group to consider whether GSICS products could/should be generated for active instruments such as DPR.
JAXA
GRWG_15.12
NOAA to report on plans to incorporate GOES-R/ABI in ICVS.
FredWu?
GRWG_15.13
NOAA to provide their GEO-LEO IR algorithm code to IMD.
29 Feb 201
GRWG_15.14
Dave to investigate the use of MIIC to generate DCC data for near-real-time processing of DCC using VIIRS.
DaveDoelling?
GRWG_15.15
Dave to investigate potential to transfer this technology to other data centres.

21. Other GRWG Actions Still Open
Action Ref
Description
Assigned to
Due Date
State
GRWG_15.17
Rob to propose new terminology, based on the term "homogenised" or "MODIS (or whatever)-equivalent.
RobRobelling?
29 Feb 2016
Due now
GRWG_15.18
EUMETSAT to circulate Rob's review of FCDR inter-calibration requirements to GRWG/GDWG, identifying which type of inter-calibration product could meet each of these.
TimHewison
GRWG_15.19
A. K. Sharma to interact with GDWG to provide INSAT-3D SRFs.
AKSharma
GRWG_15.20
EUMETSAT to interact with KNMI to see if they could process the SCIAMACHY data to have the SBAFs for the last two bands (beyond 1900nm). NASA is ready to provide the code.
GRWG_15.22
Jack Xiong (NASA) to deliver the MODIS spectral response to the GSICS wiki
JackXiong?
GRWG_15.24
Fred to implement Sebastien's deseasonalisation method and compare with Fangfang's and report back
FredWu?
GRWG_15.25
NASA to consider providing centralised processing of MODIS DCC data
NASA
GRWG_15.26
Sebastien Wagner (EUMETSAT) to present at a further web meeting on DCC the extracted time series for the NIR16 channel.
SebastienWagner
GRWG_15.27
Lin Chen and Sebastien Wagner to circulate statistics of mode/mean/median for review by .
GRWG_15.33
Dave Doelling to ask Constantine Lukashin to participate in meeting on lunar inter-calibration accounting for spectral differences.
DaveDoelling?

22. Other GRWG Actions Still Open
Action Ref
Description
Assigned to
Due Date
State
GRWG_15.34
Dave Doelling to check availability of lunar observations in the Hyperion dataset by 1 April 2015.
DaveDoelling?
29 Feb 2016
Late
GRWG_15.35
Jack Xiong and Dave Doelling to report plans to investigate the double difference between MODIS and VIIRS lunar observations in preparation to transfer the calibration reference and at web meeting.
JackXiong?
Due now
GRWG_15.36
Dave Doelling to investigate whether CLARREO could fund dedicated observation campaigns to tie lunar irradiance models to an absolute SI-traceable scale.
GRWG_15.37
Sebastien Wagner to circulate survey on participation in the planned activities to develop lunar inter-calibration to members of lunar calibration community.
SebastienWagner
GRWG_15.38
Sebastien Wagner to organize a web meeting to report on the progress made on inter-calibration using the Moon (between October and December 2015).
GRWG_15.39
NOAA to update the product user guide for GOES-IASI products to inform about the range of diurnal applicability
FredWu?
GRWG_15.42
KMA to investigate the possibility to extract the data before the MBCC is applied, and in collaboration with NOAA to assess the impact of MBCC on the data. KMA to report back at the next GSICS annual meeting.
KMA
GRWG_15.43
ISRO to explore NOAA MBCC more into detail and to apply it. ISRO to report back at the next GSICS annual meeting.
ISRO
GRWG_15.44
ISRO to report back on their investigations on SRF retrieval.

23. Other GRWG Actions Still Open
Action Ref
Description
Assigned to
Due Date
State
GRWG_15.47
JMA to investigate and provide a report on the uncertainty analysis to support progress to Pre-Operational mode.
MasayaTakahashi
29 Feb 2016
Due now
GRWG_15.49
IMD/ISRO to contact the IMD NWP and NCMRWF about double differencing of geostationary ring.
IMD, ISRO
GRWG_15.50
Tim to conduct a survey to identify a date among GPRC so that they produce the GSICS corrections for that date and provide them to Dave.  - Reported on
TimHewison
GRWG_15.51
Dave to report on the analysis of GEO-GEO double-differences.
DaveDoelling?
GRWG_15.52
Tim to provide SBAF tool to support the analysis of GEO-GEO double-differences
GRWG_15.53
NASA-MODIS (Jack) to consider investigating alternative regression algorithms in radiance instead of Tb and report at next GRWG annual meeting
JackXiong?
GRWG_15.54
CMA to report on generalising regression in GEO-LEO IR products to include polynomial terms and report by next GRWG meeting
Scott
GRWG_15.55
NOAA to investigate inter-channel calibration with IASI.
FredWu?
GRWG_15.57
Denis Jouglet to review capabilities of IASI and AIRS and CrIS? to meet the requirements for inter-calibration references for GEO-LEO IR products.
CNES
GRWG_15.58
Fred to invite Pagano and Yong Han to join this review as relevant instrument experts

24. Other GRWG Actions Still Open
Action Ref
Description
Assigned to
Due Date
State
GRWG_15.59
Dave to investigate how to share the existing data set for MODIS 0.6µm band (2002-end of 2009) with the GRWG.
DaveDoelling?
29 Feb 2016
Due now
GRWG_15.60
Larry Flynn (NOAA) to consider mechanisms to provide delayed CrIS? data for FY-2 inter-calibration
LarryFlynn?
GRWG_15.61
Rob to propose the maximum frequency on the update requirement for non-routine events
RobRoebelling?
GRWG_15.62
Manik to interact with Jérôme to push forward the development of the expert system as a tool to select inter-calibration reference instruments
ManikBali
GRWG_15.63
Tim to provide to Manik a list of parameters from his scoring proposal to include them into the expert system.
TimHewison

25. GSICS Operations Plan
Actions are tracked in a topic on GSICS Development Wiki:
Grown too cumbersome to use
Wishlist:
Clear actionees – e.g. Chair, Agency Rep, Raporteur, Person
Filterable – like GSICS Product Catalog – by name/open
Sortable – by name/org, status, open/closed date
Standardised – numbering – Actionees
Add closed dates
Add outcomes (with optional links)
Easier for actionees to add outcomes
Automatic reminders & notifications on closure …

26. Thank You for your contributions!

27. Infrared Sub-Group Report Tim Hewison
Special Issue of the IEEE TGRS on “Inter-Calibration of Satellite Instruments”:
Special Issue of the IEEE TGRS on “Inter-Calibration of Satellite Instruments”:
20 September 2018
Infrared Sub-Group Report Tim Hewison

28. GSICS GEO-LEO IR Product Status 2016-02
20/09/2018
GSICS GEO-LEO IR Product Status
GPRC
Monitored Instrument
Reference Instrument
GSICS NRT Correction
GSICS Re-Analysis Correction
GSICS Bias Monitoring
EUMETSAT
Meteosat-8 – 11 }
Meteosat-7
Metop-A/IASI
Operational
Demo
Plots RAC*
JMA
MTSAT-1R }
MTSAT-2 }
IASI (+ AIRS)
Plots RAC
NOAA
GOES-13 & -15 Imager
GOES-11 & -12 Imager
Pre-op
Prototype
GOES Sounder
Development
In development
CMA
FY2C – E
KMA
COMS-1
IASI
ISRO
INSAT-3D
Full GSICS Product Catalog available at

29. IR Product Development within GSICS
GEO-LEO IR hyperspectral
Progress existing products to Operational Status
Promote new products to Demonstration Status
Application of Prime GSICS Correction concept
To merge multiple reference instruments
To allow corrections to cover diurnal cycle
Other Agencies’ plans for Prime GSICS Corrections?
Wednesday afternoon
13:05
Xu Na (Remote)
CMA
GEO-LEO IR Progress at CMA 3i
13:20
Munn V. Shukla (Remote)
ISRO
GEO-LEO IR Progress at ISRO 3j
13:35
Arata Okuyama
JMA
GEO-LEO IR Progress at JMA 3k
13:50
Dohyeong Kim?
KMA
GEO-LEO IR Progress at KMA 3l
14:05
Yuanzheng "Jordan" Yao
NOAA
GEO-LEO IR Progress at NOAA 3m
11:25
Tim Hewison
GRWG
Do we need to generate Prime GSICS NRTCs? 3g
16:20
Fangfang Yu?
NOAA
Handling Diurnal Cycle in GEO-LEO IR 3n

30. New IR Product Development within GSICS
Scope potential new GSICS products/deliverables
Alternative inter-calibration algorithms
Retrieved SRFs
GEO-GEO inter-calibration (part of GEO-ring)
LEO-LEO inter-calibration
Traceability of Reference Instruments
Plans for TANSO-FTS/2 & CLARREO
Wednesday morning & afternoon
16:35
Arata Okuyama
JMA
v2 of GEO-LEO IR - alternative ATBDs 3o
17:45
Manik Bali
NOAA
SRF Retrievals 3r
9:00
Tim Hewison
GRWG
GEO-Ring Test Dataset 3a
9:15
Rob Roebeling
EUMETSAT
Discussion: GEO-Ring dataset preparation 3b
9:30
Discussion
All
Discussion: GEO-Ring dataset analysis 3c
18:25
Aisheng Wu
NASA
Development of LEO-LEO IR Products 3t
11:45
Rose Munro
EUMETSAT
Plans for AVHRR inter-calibration 3h
17:05
Denis Jouglet (Remote)
CNES
Hyperspectral IR comparisons - including TANSO-FTS/2 3p
17:25
Likun Wang
NOAA
IR Reference Sensor Traceability and Uncertainty 3q
18:05
Tim Hewison/Tobin
EUMETSAT
CLARREO preparations 3s

31. Thank You for your contributions!