GSC Sentinel-2 PDGS STBD - emits - ESA

GSC Sentinel-2 PDGS STBDIssue 1 Revision 2 (draft) - 25.07.2010GMES-GSEG-EOPG-TN-09-0031page 42 of 60Figure 15: PDGS Reference ConfigurationThe four stations (CGS-1, CGS-2, CGS-3 and CGS-4) have been chosen merely as anexample. As indicated in the schema and detailed in [RD-02], four different types of centrehave been distinguished according to their functions:- The CGS (Core Ground Station) has two possible configurations:• Light, with data reception role: data reception from satellite, processing up to Level-0 and relaying level-0 received data to the PAC-1.• Full, with combined data reception and data centre roles: data reception fromsatellite, processing up to Level-1C and data dissemination.- Two PACs (PAC-1 and PAC-2), each one holding a collocated LTA service functionensuring long-term data preservation in full redundancy of all Level-0, Level-1B andLevel-1C data. In addition the two PACs are configured differently as regarding their midtermrole:• PAC-1 includes a processing chain configuration to process all CGS-4 circulatedacquisitions and perform medium-term reprocessing operations on a 3 monthslevel-0 archive. It is additionally sized for on-line publishing of one year of cloudfreelevel-1C data collected from all stations.• PAC-2 is sized for on-line publishing of one year of European coverage datasupplied regularly by CGS-1/2/3 and by the PAC-1 for CGS-4 data.ESA UNCLASSIFIED – For Official Use© ESAThe copyright of this document is the property of ESA. It is supplied in confidence and shall not be reproduced, copied orcommunicated to any third party without written permission from ESA.