The ALOS ground data system function is allocated at JAXA/EOC (Earth Observation Centre) for the provision of mission operation planning, data reception and recording, processing, archiving, and the distribution of ALOS data products.
The ALOS Data European Node (ADEN) Ground Segment provides the European and African regional elements for the Japanese remote sensing satellite ALOS. The North/South American, Oceania/Australia, and Asia/Antarctic regions have been covered by nodes under the responsibility of NOAA, AUSLIG and NASDA, respectively. Each Node prepares Level-1 products and serves users with data from its respective geographical region.
The ADEN Payload Data Segment (PDS) forms a large part of the ADEN Ground Segment (GS). The ADEN GS consists of the ADEN PDS plus the Mission Co-ordination Centre (MCC) and the Technical User Services (TUSC). After the end of the activity of ALOS in May 2011, the operations of ADEN are limited to on-demand data provision.
Migration to the Multi Mission Ground Segment
In order to reduce the maintenance cost of the ALOS Ground Segment, it has been decided to migrate it from ADEN to the Multi Mission Ground Segment (MMGS). The project aims at the configuration of the MMGS for the archival of ALOS products and auxiliary data extracted from ADEN and the set-up of on-line access, restricted and bulk dissemination services for the provision of data to users.
Only level 0 data, Auxiliary data and Level 1B1 data are stored in the archive and all the superior levels that are provided to the users are produced on-the-fly when requested. Products to be produced on-the-fly are always standard scenes and once they are provided to an user, they are cached so that they can be reused in subsequent requests.
The format for the archival of products and auxiliary data will follow the EO SIP packaging convention which groups together the data and the metadata necessary for cataloguing and processing. The adoption of the EO SIP convention will also ease a possible future conversion in SAFE of the ALOS data.