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 111 of 350
On the other hand, the data-access mechanisms will be user-driven from the discovery of the
data in the catalogues down to the download of the PDGS products to the user bases.
4.5.2.2 Data-Access Interfaces
ESA’s Multi Mission User Service (MMUS) environment, and in particular its Next Generation
User Services for Earth Observation (ngEO) component, will act as front-end gateway to all
Sentinel-2 User-Products and Data-Sets versus authorised users:
○ Towards end-users, the MMUS will provide a web-portal supporting graphical query
and navigation capabilities down to the triggering of the actual product downloads with
automation capabilities.
○ Towards CDS/DAIL, the MMUS will provide an HMA compliant interface to Sentinel-2
data supporting catalogue and on-line data access, interoperable within the GSC
framework.
In complement, an independent component hereafter referred to as the On-Line Image
Browser (OLIB), will provide anonymous internet on-line access to Sentinel-2 imagery.
In support to all above methods, the actual data downloads from the distributed PDGS
archives over the communication network will be carried out by a specific component,
referred to as the Data-Access Gateway (DAG), and transparently triggered through the
MMUS and OLIB interfaces.
The following sections briefly describe the complementary roles and interface mechanisms of
each component.
4.5.2.2.1 ESA’s Multi-Mission User Services (MMUS) Portal
Towards end-users, ESA’s Multi-Mission User Services (MMUS) environment will offer a webportal
interface accessible from the public Internet with the global functionality of:
○ Providing complete and comprehensive information about the GMES Sentinel-2
mission and products (e.g. availability, formats, quality, etc.), the mechanism to
access them, and the management of a Support-Desk;
○ Providing self-registration capabilities and centralised management of user
authentication and data-access authorisations based on user grants and privileges (cf.
section 4.5.2.2.4);
○ Providing graphical query and navigation capabilities on a consistent and consolidated
catalogue of available products including the display of preview images similar to
portal page mock-up depicted on Figure 4-15;
○ Triggering the User-Product downloads according to user-defined options (e.g.
spectral bands, metadata, spatial coverage, etc as outlined in section 4.4.2) and
supporting download automation matching user-defined Data-Set subscriptions (cf.
section 4.4.3);
○ Providing enhanced data-access services whereby users can trigger their own
processors previously integrated in the PDGS as part of the hosted-processing
collaboration framework (cf. sections 4.8.1.2 and 4.10.2.2).
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