1. Hot summary of the Fourth GSICS Users Workshop
16 April 2019
Hot summary of the Fourth GSICS Users Workshop
Fred Wu, Sebastien Wagner, Jerome Lafeuille
Sopot, Poland, 4 September 2012 1

2. GSICS overview
Global Space-based Inter-Calibration System
Develops common methodologies, procedures and tools in accordance with best practices and standards
Provides services to satellite users
Capacity building through collaboration among satellite operators
14 agencies (+WMO) and observers and partners
Structure:
GSICS Executive Panel
GSICS Coordination Centre (GCC)
GRWG
GDWG
See gsics.wmo.int

3. GSICS Products GSICS Bias Monitoring GSICS Correction
Routine comparisons of satellite radiances against reference
Visualised as time series plots of calibration bias with respect to reference
New web-based bias plotting tool –
GSICS Correction
Function to correct issued radiances
For consistent calibration with reference
For Near-Real-Time and Re-Analysis applications of operational L1 data
For Archive Re-Calibration of reprocessed datasets to generate FCDRs
GSICS Reports & Guidelines
Recommendations to modify practices
Design and Operation of future satellite instruments
Special Issue of IEEE transactions

4. Data management and access
Collaboration Servers to access GSICS Products (Demo provided)
Products Plotting Tool (Demo provided)
Users Messaging Service
Products Catalogue on gsics.wmo.int (Demo provided)
Future Developments (with questions about needs and specs)
Automating Products Distribution
Archiving of the GSICS Products.
Instrument History Presentation
response to users’ requests and enquiries across different international agencies.
Instrument event log (being specified)

5. Main achievements
Several GEO/LEO IR products close to be declared pre-operational (following GPPA)
Products are standardized products and common tools available to users
Data/Products provided on line with access tools
Documentations provided to understand the products and their applications
Interaction established between GSICS and other programs such as GRUAN, GPM, SCOPE-CM.

6. Users Request (1) Need for correction for solar bands
The question of whether to supply calibration correction, or recalibrated archives will be addressed on a case-by-case basis.
Access to intermediate data: will be considered as potential future product, to be analyzed with beta users.
Need to validate the uncertainty estimation methodology with climate community.
Need for common reference channel: we will consider recommending methodology for user to use such common reference channels.

7. Requests (2) Need to move the products to “operational” stage
AVHRR IR channel cross-calibration
Increased interaction with user community (incl. climate)
Continue on-going development of products and services
Instruments : IASI-B, CrIS,..
Instrument event log (coordinated specifications)
Online tools

8. Discussion on the future Vision (1)
Scope: shall GSICS address other measurements (e.g. active, GPS RO)?
Support access to pre-launch calibration data
Should precise the type of information needed
Shall GSICS provide a variety of calibration information in addition to one official « GSICS » calibration ?
Hosting 3rd party calibration information if compliant with certain « maturity » requirements (e.g. proper documented)

9. Discussion on the future Vision (2)
Increased effort on uncertainty evaluation and documentation
Further promote concept of on-orbit absolute reference payload (CLARREO, TRUTHS,…)
Implement the calibration correction in the L1.5 data header when possible
Ensure future data formats allow inclusion of alternative calibration coefficients