GSICS References GSICS in-orbit References are in-orbit instruments that are highly stable instruments, that can help in monitoring other in-orbit instruments when compared with. Below is a table with references for each channel.
Channel | Reference Instrument/Record | Period | *Version* | Status | Major Events | GSICS Maturity | End Date | Recommendation to Users | |
| | | | | | | | |
Infrared | IASI-A | | | Deorbiting | End of Life Schedule | | Apr 2021 | Switch to IASI-B/C/ and Beyond for instrument monitoring |
| IASI-B | | | Operational | | | | |
| IASI-C | | | Operational | | | | |
| NOAA-SNPP/CrIS | | | Instrument completes designed lifespan | Change of Electronics | | July 22, 2021 | Switch to Jx-CrIS for instrument monitoring |
| NOAA-20/CrIS | | | Operational | | | | |
| NOAA-21/CrIS | | | | | | | |
| AIRS | | | Operational | | | | |
| MODIS(AQUA) | | | 2002 to 2018. | | | | |
VIS/NIR | NOAA-20/VIIRS | | SDR Versions | | | | | |
| NOAA-21/VIIRS | | | | | | | |
| | | | | | | | |
Microwave | AMSU/MSU FCDR | | | | | | | |
| NOAA-20/ATMS | | SDR Version | | | | | |
| | | | | | | | |
UV | | | | | | | | |
| | | | | | | | |
Glossary *
Channel *
Reference Instrument *
Period ( of best reference) * Version: The version of records that is best recommended ( can be more than one ) *
Status: Most recent status of the reference instrument that can directly impact inter-calibration outcomes. *
Major Event: Major events during the best lifetime of the reference instrument *
GSICS Maturity: Three colors denoting ( Green: If GSICS has formally designated it as GSICS Reference, Yellow: If recommended as a GSCICS reference ).
Reference Selection Matrix
IR sounder
1. Sensor performance stability
2. Spectral coverage/Spectral resolution
3. Error budgets (prelaunch characterization and post-launch verification)
4. Geo-location accuracy
5. Data availability
MW sounder 1. Sensor performance stability
2. Field of view (FOV) consistency (ATMS has oversampling FOV and can be B-G to AMSU-A and MSU)
3. Error budgets (prelaunch characterization and postlaunch verification)
4. Geolocation accuracy
5. Data availability
VIS/NIR
•The reference instrument must have an active instrument calibration team funded by the project over the lifetime of the satellite
- Must have onboard calibration that is well characterized, preferably with SD and lunar monitoring
- The pre-launch and on orbit calibration must be well documented in journals
- The data must be publicly available and easy to order and download and be released in near real-time
- The instrument must have many users to verify the calibration and discover any calibration anomalies
For the UV we don't have a reference instrument and a selection Matrix
as yet, however GOME and OMPS are the most commonly used instruments for 200nm-350nm measurements
** References*
Likun Wang | NOAA | IR Reference Sensor Traceability and Uncertainty | 3q
|
Manik Bali et a. | NOAA | Selecting GSICS References: IR, VIS and MW | 3e |
Related Decisions
D.GIR.2019.7k.1 | | All agencies to switch to IASI-B asap as Anchor reference for NRTC and RAC products. |
D.GIR.2018.4w.1 | | CrIS accepted as a reference on the basis of a positive answer to all the above questions. |
D.GVNIR.2017.8u.1 | | S-NPP/VIIRS a GSICS inter-calibration reference. |