GSC Sentinel-2 PDGS OCD - Emits - ESA

GSC Sentinel-2 PDGS OCD
Issue 1 Revision 2 (draft) - 25.07.2010
GMES-GSEG-EOPG-TN-09-0008
page 104 of 350
4.5 Mission Operation Concepts
This section aims at providing a comprehensive view over PDGS operations within the overall
Sentinel-2 mission context. The high-level mission operation concepts are building upon the
SOCD [AD-03] to meet the high-level mission requirements expressed in [AD-01]. The
operation constraints outlined in the previous section will be referred to as relevant.
The GSC Data-Access System operation scenarios defined in [AD-02] are also applicable.
4.5.1 HIGH-LEVEL CONCEPTS
4.5.1.1 Multi-Spacecraft Operations
All mission operation concepts apply to the Sentinel-2 constellation as a whole which is
assumed to include after the launch of Sentinel-2B two spacecrafts operating concurrently as
defined in section 3.3 and to sustain this configuration in the long-term by the gradual
inclusion of replacement units.
As such, the operations specifically applicable to each unit in orbit will naturally cascade from
the high-level scenarios global to the constellation, each one contributing to the global
mission objectives.
Nevertheless, the possibility to fine-tune the mission returns by load-balancing rules amongst
the units is embedded in this principle and will be highlighted when relevant in the operation
concept descriptions.
4.5.1.2 Systematic and Data-Driven PDGS Operations
Taking advantage of the global and systematic nature of the Sentinel-2 data-acquisition plan,
the product elaboration processes implemented by the PDGS will be entirely mechanical and
data-driven whereby the data processing down to the delivery to users will plainly cascade
from the data reception at the CGS in a systematic manner.
At the PDGS output gateways, data-access workflows will allow users to harvest the PDGS
production either interactively or automatically extending the stream of data products down to
the user-base following the subscription concept.
4.5.1.3 PDGS Automation
The PDGS operations will embed in all end-to-end processes a high degree of automation
requiring only operator supervision wherever feasible throughout the chain starting at the
mission-planning stage and ending at product delivery.
Specific processes will however include break-points wherever human intervention is deemed
necessary to bridge the workflow such as:
o Generally the Cal/Val and product Quality Control activities requiring specific care and
expertise;
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