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 78 of 350
Landsat experience and they are extrapolated for Sentinel-2, leading to a first estimate of
400Tbytes as yearly supply requirement.
In this respect, the ability of the PDGS to scale adequately to this short-term to long-term
evolution, planned or unplanned, is considered a major PDGS driver to meet the Sentinel-2
mission objectives in the long-term. In this sense, scalability is focusing on the accessibility to
data down to the download from the user base.
4.3.5.4 G-POD Experience at ESA
Since 2007, ESA is running a collaboration opportunity for conducting Earth Science research
activities through the use of ESA’s Earth Observation Grid Processing-on-Demand (G-POD)
environment [http://gpod.eo.esa.int], called the G-POD CAT-1 Opportunity [RD-36]. This
opportunity, performed in partnership with end-users, has the main purpose of stimulating the
use of global EO mission archives, offering attached computing infrastructure and tools with
on-line access to data to assist the generation of scientific added-value products.
Since then, wide-ranging projects are supported under this collaboration framework whereby
the scientific or institutional partners run their own data-processors in the shared G-POD
environment and process large amounts of data while tailoring it to their specific needs,
including:
○ The prototyping, development and validation of new algorithms requiring large
amounts of long-term data and processing resources;
○ The timely extraction of long-term time series of lightweight data from Terabytes of
mission archived data;
○ The swift on-demand pre-processing of new or past EO data in direct response to
urgent data supply needs.
As combining the dual roles of an on-line investigation laboratory and a powerful operational
production system, the G-POD opportunity tends to extend to supporting more and more
sustainable services and productions. The following outcomes are highlighted in particular:
○ A large number of Level-2 or Level-3 products from Envisat, ERS or third-party
missions are operationally hosted on G-POD as derived from the G-POD CAT-1
opportunities and other ESA projects;
○ New Level-2 products resulting from the G-POD collaboration opportunities are being
sustained in production and take part to the operational data-supply services of the
GSC/DAP (DAP_MG3_02 Data-Set [RD-10]).
○ G-POD hosts since October 2009 the on-demand service for emergency response
called FAIRE (Fast Access to Imagery for Rapid Exploitation) supporting the
preparation of crisis mapping data (spatially registered and ortho-rectified time series
of ERS/Envisat SAR images) for the Internal Charter Space and Major Disasters
[http://www.disasterscharter.org].
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