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Simple ARD Service: FAQs

How does the Simple ARD Service relate to Defra’s Earth Observation Data Service (EODS)?

Defra’s EODS was launched in 2020, providing Sentinel-1 and 2 ARD for England via a user-friendly interface, web services and API. The Simple ARD Service complements the EODS by providing access to ARD beyond England. Data and metadata from both services are produced by the same methods to the same standards, enabling UK-wide analytical applications.

 

Who provides CEDA services and how is this funded?

CEDA services are provided on behalf of the Natural Environment Research Council (NERC) via the National Centre for Atmospheric Science (NCAS) and the National Centre for Earth Observation (NCEO).  CEDA is based within the RAL Space department of the Science and Technology Facilities Council (STFC).  JASMIN is co-managed by CEDA and STFC's Scientific Computing Department.

 

Does the Simple ARD Service provide web services?

The SAS does not currently provide web services: data can either be downloaded or accessed programmatically via API.  Web services provide an efficient way of delivering satellite imagery and/or derived products into desktop GIS or corporate mapping tools.  Consultation and market research is underway to determine the best way of meeting user needs for satellite web services in Scotland and Northern Ireland.

 

Who can use data provided by the Simple ARD Service? Can data be used commercially?

The ARD is provided as Open Data under the Open Government Licence v3.  Anyone can use the data and there are no charges or limitations on download.  ARD can be used commercially and can be combined with other information, but the source of data must be acknowledged.

 

How do I acknowledge use of data from the Simple ARD Service?

Please acknowledge data with the following text: “<Sentinel-1 / Sentinel-2> analysis-ready data processed by JNCC and supplied under the Open Government Licence v3 via the CEDA Archive [archive.ceda.ac.uk].”

 

What quality control procedures are applied to the ARD?

For both Sentinel-1 and Sentinel-2, a proportion of outputs are visually checked every week.  Experienced staff check a selection of datasets for geolocation, coordinate reference system, band responses, pixel size and feature alignment.  For Sentinel-2, the topographic shadow and cloud masks are also checked.  There are several known issues with Sentinel-1 and 2 ARD which do not constitute QC failures – these are documented in the user guide.

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