Abstract
In order to take advantage of the Sentinel program, the Norwegian Space Agency decided to establish a national collaborative ground segment for satellite data with the purpose of simplifying data access, ensure support for operational national services and long term preservation of data. This is the NBS where MET Norway has the technical responsibility in terms of providing the infrastructure and storage capacity for data management. Serving the data through two separate platforms, the end users have access to the data in its original format in addition to Sentinel-1 and Sentinel-2 products in NetCDF-4/CF. Using the latter format, services like regridding, subsetting, visualization and aggregation are integrated utilizing OPeNDAP in combination with OGC WMS and OGC WPS. In addition, data uploading and retrieving operations are simplified for an end user since streaming of data by means of OPeNDAP is supported in multiple programming languages. Due to the strong coupling between space based earth observations, in-situ observation, model data etc, disseminating data in a generic data management system utilizing NetCDF-4/CF and OPeNDAP is convenient for seamless integration across branches. However, the current CF version is not mature for handling all parts of the Sentinel data but future development looks very promising.
Highlights
The European Space Agency (ESA) has developed a new series of satellites which are dedicated to specific missions
The primary focus of NBS has been on delivering all Sentinel products through the DHuS while simultaneously making Sentinel-2 Level-1C and Sentinel-1 Ground Range Detected (GRD) products available in the NBS setup
Concerning the utilization of DHuS in the Collaborative Ground Segment (CGS), MET Norway currently retrieves the GRD, Single Look Complex, level 2 Ocean & raw Sentinel-1 products data from the Sentinel retrieval and dissemination nodes provided by ESA, along with the Sentinel-3 land products
Summary
The European Space Agency (ESA) has developed a new series of satellites which are dedicated to specific missions. These are the Sentinels which are focusing on the operational needs of the European Union’s Copernicus program for Earth Observation (EO). Ever since the first satellite programs were launched, the access to remote sensing products has been limited in terms of costs and restrictions (Turner et al 2015). The paradigm shift introduced by NASA in 2008 with Landsat and later through the European Sentinel program, where high resolution remote sensing products are made easy available for the public under a free data policy, enables the exploitation of data for a broader set of institutions, for small and medium-sized enterprises and for private persons, enhancing data value (Council 2012; Wulder and Coops 2014)
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