GSC Sentinel-2 PDGS OCD - Emits - ESA
GSC Sentinel-2 PDGS OCD - Emits - ESA
GSC Sentinel-2 PDGS OCD - Emits - ESA
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<strong>GSC</strong> <strong>Sentinel</strong>-2 <strong>PDGS</strong> <strong>OCD</strong><br />
Issue 1 Revision 2 (draft) - 25.07.2010<br />
GMES-GSEG-EOPG-TN-09-0008<br />
page 170 of 350<br />
4.8.1.1 Collaborative Data-Access Mirroring Centres<br />
This opportunity aims at contributing to enhancing the global <strong>Sentinel</strong>-2 data-access<br />
availability, reliability and performance by locally mirroring the data from third-party operated<br />
premises in counterpart of a privileged access to <strong>Sentinel</strong>-2 data products.<br />
This collaborative opportunity is motivated by the demonstrated successes of digital media<br />
sharing opportunities offered throughout the internet, further complemented by the trends<br />
advertised by internet carriers in optimising the effective bandwidth by replication and<br />
localisation of the data close to its consumers.<br />
From the <strong>PDGS</strong> system point of view, collaborative data-mirroring centres will be seen as an<br />
extension of the <strong>PDGS</strong> operationally supplied with <strong>Sentinel</strong>-2 products and contributing to the<br />
harmonised on-line publishing of the data they hold locally by implementing the <strong>PDGS</strong> dataaccess<br />
protocols.<br />
From the collaborative centre point of view, the core <strong>PDGS</strong> will act as primary data supplier<br />
granting privileged access to large quantities of <strong>Sentinel</strong>-2 data products reusing the <strong>PDGS</strong><br />
standard cross-archives data-circulation mechanisms (cf. section 4.5.4.9). In addition, the<br />
core <strong>PDGS</strong> will provide operational data-management software to be hosted and operated<br />
locally for receiving, housekeeping and relaying the data internally to legacy systems as well<br />
as externally to <strong>GSC</strong> users.<br />
A dedicated <strong>PDGS</strong> service will be defined and operated to enable this type of collaboration<br />
(cf. section 4.10.2.1).<br />
4.8.1.2 Hosted Processing Collaboration Opportunity<br />
The <strong>Sentinel</strong>-2 <strong>PDGS</strong> will provide a dedicated service to data users enabling their data<br />
processors to be hosted and run in the <strong>PDGS</strong> processing environment. This collaborative<br />
opportunity fosters the development of additional products to complement the base product<br />
list provided through the core <strong>PDGS</strong> services. It is motivated to a large extent by the recent<br />
experience at <strong>ESA</strong> in this domain (cf. section 4.3.5.4) and as such aims for a significant reuse<br />
of the established concepts applicable to the G-POD CAT-1 opportunity (cf. [RD-36] and [RD-<br />
37]).<br />
The goal of this service is to foster the use of <strong>Sentinel</strong>-2 data and the development of new<br />
derived operational products by enabling the remote access and processing of <strong>PDGS</strong> core<br />
products according to user-provided algorithm implementations.<br />
This service ultimately aims at enhancing the <strong>PDGS</strong> offerings vis-à-vis the GSPs indirectly or<br />
directly:<br />
○ Indirectly through collaborations with scientific research partners whereby new and<br />
complementary <strong>Sentinel</strong>-2 value-added products (e.g. Level-2) can be test-bedded,<br />
validated on large datasets, and finally swiftly transferred to sustainable operations for<br />
global usage.<br />
This collaborative approach avoiding bulk product transportation commonly required<br />
for algorithm development aims at solving data-access bottlenecks while making new<br />
processors ready for swift operational deployment when required;<br />
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