Lunar Calibration activities
Status of GIRO and GLOD policy,
infrastructure and study on inter-calibration
S. Wagner, B. Viticchiè, T. Hewison
EUM/STG-SWG/41/16/VWG/17
GSICS Implementation of the ROLO model (GIRO)
• Intellectual Property Rights cleared for ancillary data (solar and lunar spectra) + SPICE
kernels:
 Acknowledgement to the data and tool producers
 Details about the composite lunar surface reflectance spectrum to be provided
(ID numbers + weights in the composite)
• IPRs cleared with Numerical Recipes routines:
Coded rewritten from scratch (GIRO v1.1.0)
Verified against version with Numerical Recipes (see following slides)
• Next steps:
1. EUMETSAT’s internal procedure for Verification + Validation by end September
2016
2. Code analysis to check license compliance  by mid-October 2016
3. Preparation of a License Agreement to be agreed and signed by licensees =
Condition for access to the GIRO + GLOD (following the policy presented at GSICS
EP in May 2015)  by end September 2016
4. Set-up of an infrastructure for GIRO + GLOD on EUMETSAT’s website (web page
with relevant information/documents + helpdesk service + link to GIRO + GLOD
repositories)  by end 2016
EUM/STG-SWG/41/16/VWG/17
Verification of the GIRO v1.1.0
Geometries  from MSG1 time series
Top panel: collection of “smooth” reflectance
spectra organized in progressive number (along
the X axis).
Central panel: difference between the reflectance
spectra image in the top panel and the same image
derived with the old version of the robust linear
fitting as found in [NRC];
+ comparisons of a and b coeffs from linear fit
(varying between the dotted lines)
Bottom panel: transect of the difference image
(central panel) along the frequencies of the MSG1
VNIR bands which are calibrated using the GIRO
(see the legend).
EUM/STG-SWG/41/16/VWG/17
Verification of the GIRO v1.1.0
EUM/STG-SWG/41/16/VWG/17
Verification of the GIRO v1.1.0
EUM/STG-SWG/41/16/VWG/17
Verification of the GIRO v1.1.0
EUM/STG-SWG/41/16/VWG/17
GSICS Lunar Observation Dataset
• Contains Moon observations from all instruments using GIRO 
please provide updates if required
• Helps builds consensus on absolute calibration of GIRO
• Helps develop inter-calibration methods
• Timeline for distribution = same as the GIRO
• Distribution to GIRO source code and GLOD upon signature of the
license agreement  not blocked by the availability of the
infrastructure
EUM/STG-SWG/41/16/VWG/17
Coming up soon…
• Interaction with USGS to document the traceability of the GIRO to the
ROLO:
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Definition of a benchmark for testing systematically the GIRO against the ROLO
Will be part of the GLOD
Could be used to test other models
Formalising the traceability
Preparation of a paper to be used as the reference to the GIRO for future
publications
• Mid-November = planned date for the study on the validation of SBAFs
with lunar hyperspectral measurements.
• Implementation of the inter-calibration scheme proposed at the GSICS
annual meeting in 2016  prototype by end 2016
EUM/STG-SWG/41/16/VWG/17
GSICS and GLOD usage policy
• Please remember the policy…
• So-far agreed by email but still, it is in place and shall be followed.
• Link under the Lunar Calibration Algorithm Work Area (GSICS wiki):
http://gsics.atmos.umd.edu/pub/Development/LunarWorkArea/GSICSEP-16_Doc_13_GIRO-GLOD-policy.pdf
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Second Lunar Calibration Workshop
Listing potential topics to be addressed…
EUM/STG-SWG/41/16/VWG/17
Background
• First Lunar Calibration Workshop
• Hosted by EUMETSAT
• December 2014
• Second Lunar Calibration Workshop
(still to be confirmed)
• Co-organised and hosted by the
Chinese Meteorological Administration
• Probably second half 2017
• Topics still to be defined
Examples of Moon observations from instruments represented in First
Lunar Calibration Workshop
EUM/STG-SWG/41/16/VWG/17
Proposed main topics
• Measurement/observation campaigns:
• Outcome of those campaigns (dataset, analysis, new model, better
characterisation of existing model, etc.)
• CMA
• SELENE?
• Experiments using CIMEL?
• How to use those measurements?
• Hyperspectral from space?  SCIAMACHY, HYPERION, OCO-2?
• Improvement of the ROLO/GIRO: e.g. how to make use of all the
measurements?
• Inter-calibration using the Moon
• Alternative methods: radiance maps of the Moon and their use for
absolute calibration using Moon sites as invariant targets, new lunar
references, etc.
EUM/STG-SWG/41/16/VWG/17
Potential items to categorise…
• ROLO/GIRO:
• Interpretation of the results
• Definition & Development of a common analysis tool (for GIRO
input/output)
user requirements + implementation (by who?)
Workshop to compare the outcome?
• Evolution of the ROLO/GIRO (Traceability)
• What about the old question of the oversampling factor?
• Inter-calibration:
• Similarly, definition of a common tool for comparisons
• Measurement/observation campaigns:
• Commissioning/Validation data: MSG1, MSG3, AHI (Himawari 8 + 9),
ABI, FY-2H, other? What could we make out of those data?
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