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 114 of 350
○ The routing and tunnelling throughout the PDGS of the hosted-processing tasks
triggered via the MMUS, based on the user-selected catalogue items (e.g. Level-1C
tiles) and processing options;
○ The download of the TCI images from the PDGS archives for visualisation and/or
delivery at the user base according to the user-triggered OLIB interactions.
As encapsulating the complete data-access process down to the user base, the DAG
component will implement a client-server mechanism between the PDGS core infrastructure
elements acting as servers and the user-base platforms acting as clients. The internal data
exchange protocol between the PDGS servers and the clients will be transparent to the data
consumers. As for any protocol (http,. ftp, bittorrent, etc), this approach will thus require
minimal software to run on the client side which will be kept simple and portable for
deployment at the user-base.
4.5.2.3 Registration & Access Grants
A registration process will associate specific grants to users or group of users. This process
will be delegated to the Multi-Mission User Services (MMUS) (cf. [RD-44]). Grants will be
configurable per type of product and/or datasets with possible restrictions such as:
○ User registration capabilities including self-registration;
○ User groups definition (e.g. anonymous users, registered users, etc);
○ User priorities management for the data-access activities based on user groups and
profiles (i.e. data-access requests will define a priority level based on the user profile);
○ User authentication;
○ Datasets definition (i.e. collections) by different criteria such as Sentinel-2 spacecraft
unit, sensing-time, age of the data, etc;
○ Submission of hosted-processing requests based on the user profiles (only specific
users will be able to submit hosted-processing requests);
○ User authorisation wrt product discovery and product download activities on the
different datasets;
○ Accessibility to reserved datasets containing products such as calibration products or
products under investigation after quality-control assessment activities. Such products
will be hidden to general users whilst accessible to Cal/Val and QC teams;
○ Subscriptions management to the different available datasets for every individual user;
○ Accessibility to specific versions of the available product collections discriminating
amongst several revisions of the processing algorithms (e.g. to allow or prevent
accessibility to new collections generated after reprocessing campaigns).
It is expected that this level of granularity will provide, if and when required, the adequate
leverages to well balance the data-access load among users while allowing for optimising the
PDGS resources accordingly.
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