Today some of the Earth Observation (EO) products from Copernicus program are accessible for free via the Open Access Hub, co-developed by Serco and GAEL systems (https://scihub.copernicus.eu/). Given the large size and the increasing number of EO products, downloading and storing those data on your premises are more and more costly and time consuming.
This is why the European Commission entrusted the development of a platform called DIAS (Data and Information Access Services) to the European Space Agency, allowing any user (Space companies, Service providers, SME, researchers, students, individuals etc.) to access to petabytes of EO data on the cloud. Any user can also build its own applications in the cloud by renting Virtual Machines.
The European Commission funded 5 consortiums. 5 approaches for the same target : data is free, access to the data is free, only the computing capacity is not free of charge.
GAEL systems is part of the Serco, OVH, Sinergise consortium that has developed ONDA DIAS and is operating it (https://www.onda-dias.eu/cms/)
ONDA relies on OVH cloud infrastructure and GAEL systems ENS (Elastic node Server, https://www.gael-systems.com/products/ens/). The ENS allows data to be retrieved from the data source, stored and ingested in a database. The access to data is easy thanks to a logical path.
The Sentinel-1, Sentinel-2, Sentinel-3A, Envisat, Landsat-8, the Copernicus Services land and marine are already available on ONDA. By the end of 2018, the Sentinel-5p and the Copernicus Services atmosphere will also be available.
Each product type can be supported by ONDA DIAS thanks to the related addons developed by GAEL systems. The addons allow the ingestion, the dissemination and the browsing of those products.
Virtual paths to products
The backend storage contains millions of products. Displaying the entire list of products via ENS interface to the end-user is not possible with a unique directory.
Each product of ONDA DIAS service is described by a set of metadata (acquisition platform name, times, sensor mode, etc.) These metadata follow the HMA/OGC standard (http://docs.opengeospatial.org/is/10-157r4/10-157r4.html).
The ENS solution allows to find the products thanks to paths built with the Metadata. The paths to these products are called virtual paths or pseudopaths.
More info about metadata and virtual paths here :