An interactive website to view and contribute to Sentinel-3 and Sentinel-6-MF OLTC for inland waters measurement
The website, developed by Noveltis for ESA, offers the possibility to display the Open-Loop Tracking Command (OLTC) tables for inland water targets currently onboard ESA Sentinel-3 SRAL altimeters, as well as the Copernicus Sentinel-6-MF Poseidon-4 altimeter. The addition of Sentinel-6-MF is one of the new features of this latest release and brings the total number of hydrological targets displayed to ~180,000 worldwide.
An interactive map allows visitors to navigate and display elevation commands defined over lakes, reservoirs and rivers overflown by the three nadir altimeters.
In addition to the improvement of the general layout of the website, several visualization tools have been added to enhance the OLTC website experience: choice of map layout, display of satellite ground tracks, filter by target type...
Screenshot of the OLTC website new display
Outside of these hydrological targets, the elevation command defined in the OLTC table is set to the mean continental surface elevation, so that the altimeter constantly tracks the Earth’s surface.
Call for hydrology users’ contributions
Users wishing to further contribute to OLTC contents may sign up and have access to additional functionalities: once logged in, they have the possibility to submit modifications of existing elevations as well as requesting new targets that may not yet be defined in the onboard OLTC tables.
For example, adding a target over a river or a lake, in order to enhance the OLTC contents and make sure that the altimeter will acquire quality echoes over the defined targets. Requests may be submitted directly using the "Contribute" tool on the right panel or by sending a list of targets to the OLTC database management committee.
We encourage scientists and Sentinel users to visit the website and contact us via the Contact form for further questions.
Background information on the Open-Loop mode
The Open-Loop Tracking Command (OLTC) represents a major evolution of the altimeter tracking function that was first developed for Jason-2 and SARAL/Altika missions as probative mode (called Diode/DEM mode).Taking into account this experience, this tracking mode's efficiency has been proven and it is now stated as operational mode for Jason-3, Sentinel-3 and Sentinel-6-Michael-Freilich missions.
On Sentinel-3, areas of interest define where SRAL is operated in OLTC mode. Outside these areas, SRAL altimeters operate in Close-Loop mode (i.e. autonomous tracking mode), with no a priori elevation information used to set the echo reception window.
On Sentinel-6-MF, Poseidon-4 nominally operates in OLTC mode over all oceans and continental surfaces.
We would like to inform you that the 6th S2VT meeting has been scheduled to take place on 12-14 September 2023, in ESA-ESRIN, Frascati, Italy.
More information on the registration procedure and abstract submission are available here.
It will be an in-person meeting, so to encourage interaction among participants and to foster cooperation and synergies among users and Cal/Val teams.
The workshop is organised around oral and poster presentations selected by the ESA’s Organisation Committee. Recommendations from S2VT provide essential information to ESA to progress with evolutions and improvements of the Sentinel-2 core data products.
On 24 January 2023 the new Copernicus Data Space Ecosystem released its initial services providing to access a wide range of Earth observation data.
Today the Copernicus Data Space Ecosystem extends its offer of data access APIs and processing tools and will continuously be upgraded in the coming months to provide the key public service capabilities and data offer by July 2023.
The extended services and tools deployed this week include:
An updated and enriched web portal
The addition of STAC items and STAC API
The Copernicus Browser is now also available for non-registered users with basic functionality and gets extended with advanced search and querying capabilities
Sentinel Hub Catalogue, OGC, statistical and process APIs for Sentinel-1 GRD, Sentinel-2 L1C/L2A, Sentinel-3 L1 OLCI/SLSTR and Sentinel-5p collections
Registration and verification of traces for freshly ingested data
Additional information regarding the services and tools that will be gradually extended during the upcoming months is available in the full service roadmap.
Key service capabilities and offering by July 2023
This progressive phase-in period leaves time for users to migrate their services and familiarize themselves with the new service interfaces. Users of the Copernicus Data Hub are encouraged to re-register and migrate their workflows to the Copernicus Data Space Ecosystem before July 2023.
The Copernicus Data Hub distribution service will continue its full operations until the end of June 2023 to allow a smooth migration to the new Copernicus Data Space Ecosystem service by all user communities. As from July 2023 and until September 2023, the Copernicus Data Hub distribution service will continue offering access to Sentinel data with a gradual ramp-down of the operations capacity and data offering.
Calling on all interested users of Sentinel data, who would like to submit their results, turning their experiences into 'success stories'.
If you have a good story to tell, of how any of the Sentinel satellites are producing data that bring benefit to your work and/or to society, please contact the Sentinel Online Editors at: email@example.com with your proposals.