1. Technical Expectations from Organizers & Participants B. Fougnie, S
Technical Expectations from Organizers & Participants B. Fougnie, S. Lachérade (CNES) S. Wagner (EUMETSAT) T. Stone (USGS) J. Xiong (NASA)

2. Context
Framework :
Moon is now extensively used by many operators, to help calibration
1st goal = monitoring of the temporal evolution
today the ROLO model is one way to achieve that
Today, several implementation of the ROLO model
difficulties to implement the model
many difficulties & discrepancies when cross-comparing results
limitation in the development of lunar calibration activities
Tomorrow, move toward
better diffusion of the ROLO model
in the sense implementation of a version/configuration
closer collaboration between groups working on Lunar cal.
improvement of methods : phase, cross-calibration, absolute…
24/06/14

3. Context Objectives of the workshop :
1/ work with a common validated implementation (GIRObox)
GIRObox has to be prepared (EUMETSAT/USGS, NASA, CNES)
participants have to install the GIRObox [before WS]
cross-check has to be made [during WS]
2/ generate a reference dataset for validation/comparison [during WS]
= Lunar Calibration Reference Dataset (LCaRD)
participants have to produce their sampling dataset [before WS]
= Owner Data Set (ODS)
3/ share largely the experience (…and a bit of data)
participants have to explain what they are doing [during WS]
a report has to be derived [after WS]
What has to be done before the WS ? What do you need to prepare ? What will be done during the WS ?
24/06/14

4. Inputs for the Calibration Processing Chain
I/O from raw image to calibration result …
Acquisition = raw image
Preprocessing (dark, DRNU, straylight …)
 i= raw image
 i= set of instrumental + system parameters
 o= corrected image
Computation of the observed lunar irradiance – integration over the disk
 i= corrected image
 i= system parameters : oversampling factor, IFOV
 o= observed lunar irradiance
Computation of sat/sun selenographic coordinates
 i= date + position of satellite (X,Y,Z)
 o= selenographic coordinates
ROLO Prediction of Lunar irradiance
 i= selenographic coordinates
 i= spectral response function (SRF)
 o= predicted lunar irradiance
Calibration diagnostic
 i= observed + predicted lunar irradiance
 o= calibration coefficient
Instrument operator #1
Instrument operator
+ option GIRObox #2
GIRObox
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5. Inputs for the Calibration Processing Chain#1 #2 #2
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6. Inputs for Part #1 – Observed Radiance
Goal = check the pre-processing compliancy
Preprocessing (dark, DRNU, straylight …)
 i= raw image
 i= set of instrumental + system parameters
 o= corrected image
Computation of the observed lunar irradiance – integration over the disk
 i= corrected image
 i= system parameters : oversampling factor, IFOV
 o= observed lunar irradiance
Instrument operator #1
Instrument operator
+ option GIRObox
Needed for the WS from all participants :
PPT presentation including :
all preprocessing steps : conversion digit -> radiance including artifacts
and consideration of oversampling and IFOV
the moon masking + integration of the lunar disk (if relevant)
a list of recommendation / feedbacks
samples of Radiance imagette // DC imagette // Observed lunar irradiance (defining the Owner Data Set) generated using - own processor, and/or GIRObox
24/06/14

7. Inputs for Part #2 – Predicted Radiance
Goal = validate the implementation of the GIRObox
Computation of sat/sun selenographic coordinates
 i= date + position of satellite (X,Y,Z)
 o= selenographic coordinates
ROLO Prediction of Lunar irradiance
 i= selenographic coordinates
 i= spectral response function (SRF)
 o= predicted lunar irradiance
GIRObox #2
Needed for the WS from all participants :
samples of observed lunar irradiance (Owner Data Set) including
Integrated observed lunar irradiance
traceable to a product/processing version or a calibration version
Time and position
normalized spectral response function (SRF) of instrument
predicted lunar irradiance for all samples using GIRObox
24/06/14

8. Homework – WS Owner Data Set
Preparation required for all participants
 GIRObox + your own dataset (image and/or data)
ROLO will be implemented by EUMETSAT/USGS in the GIRObox
GIRObox will be provided to GSICS through EUMETSAT facilities
Install GIRObox in your system
Run GIRO to compute Predicted Lunar irradiance for your Owner Data Set
Baseline = reference prediction of the Lunar Irradiance using ROLO
Optional ? = integration of the lunar disk from the corrected images
to derive observed integrated irradiance
Definition of the Owner Data Set (ODS)
Mandatory set : limited to minimum needs and including
integrated irradiance for at least N phase angles (when available)
time, position of satellite X,Y,Z
Optional set :
a larger range for phase angle
corrected images (instead of integrated irradiance)
24/06/14

9. During the Workshop
All individual contribution (Owner Data Sets - ODS) will be gathered into a global Lunar Calibration Reference Dataset (LCaRD)
LCaRD = for the first time, a unique reference dataset with a wide range of satellite instrument
All participants would be able to process the whole LCaRD with their lunar calibration chain (which must include at least the GIRObox)
During the WS, it is required that every team would be able (or through a real-time contact point within their agency) to address specific questions that would need to be discussed of for which a modification/test/reprocessing would be necessary
Also be prepared to analyze the results (visualizing tool…)
24/06/14

10. Participant expectations
Top-level goals of the WS :
everybody uses the same validated reference of the ROLO model
everybody could use the same Lunar Calibration Reference Dataset
Participants expectations : we would like to better understand your motivations & needs
GIRObox = basic ROLO implementation + Optional functionalities
balance between additional functions and complexity of the tools/inputs
GIRObox for WS validation purpose, but we want it to be useful
Intermediate outputs/inputs ? Consensus on NetCDF ?
Definition of the Owner Data Set (sampling) ?
24/06/14