Minimize Data Quality Information

The Copernicus Coordinated data Quality Control (CQC) is the CSCDA component in charge of monitoring, storing and making available the quality reports related to the missions, datasets and products contributing to the Copernicus Space Component. The quality information stored and managed by CQC is tightly bound to the overall CSCDA model where:

  • Datasets are defined in response to the Data Warehouse requirements and act as "product containers"
  • Products are issued by the Copernicus Contributing Missions Entities (CCMEs) to populate the datasets, following specific dataset requirements
  • Copernicus Contributing Missions (CCMs) (namely ‘platform/instrument') acquire and deliver the products.

Whilst the CCMEs retain responsibility for the quality of delivered products, the CQC is in charge of ensuring traceability of the quality information for the delivered CCMs data products.

The CQC also supports :

  • the integration of CCMs into the CSCDA with the Instrument/Product Specification (IPS) and Sample Datasets provided by the CCMs,
  • the investigations of data quality anomalies,
  • the assessment of the overall datasets quality,
  • the monitoring of the CCMs reported products quality does not degrade below the specified performances (e.g. in case of instrument degradation),
  • the coordination of harmonisation initiatives.

Copernicus users can access data quality reports and information stored in the Coordinated Data Access Infrastructure through the CQC Catalogue, following the instructions available in the CQC Catalogue search form document, using their SSO credentials.

Copernicus users can access the Instrument/Product Specification (IPS) through the Visualisation Tool. Users can further discover, display and compare information about the instruments and products available within the data offer. The IPS Visualisation Tool contains details on a wide range of CCMs, providing assistance with the proper application of their products for the needs of the Copernicus users and also for further data quality assessment.

Results of the harmonization activities can be found here : CQC Harmonisation initiatives

CQC Quality Reports and IPS Visualization tool

The CQC catalogue manages several types of quality reports; depending on their nature and their content, they can relate to:
One or more datasets
These quality reports provide information covering the whole dataset (or a large subset of dataset products).
One or more products
These quality reports provide specific information that is only applicable to the product(s) associated to it. Typical examples are the Product Quality Reports (PQR) that focus on the quality of a single product.
A specific platform/instrument
These quality reports provide information on a specific mission, typically for a specific period of time. This can be, for example, Mission Performance Reports (MPR). This quality information is applicable to all the products acquired by the mission in that period of time, regardless of the datasets they contributed to.

The quality reports types handled by the CQC system are detailed below:

Quality report type Description
Instrument/ Product Specifications reports (IPS)

Instrument and product specification reports are documents issued on a per platform/instrument basis by the given CCME responsible for data provision. They include a broad range of quality information, from the mission characteristics up to instrument/ product accuracy. The IPS can be also easily reached via the IPS Visualisation tool (see next section below).

Background Documentation (BGD)

Background documentation can be any type of document related to the quality aspects of a specific mission and instrument.

Typical background documentation includes detailed instrument or product characteristics and calibration plans, in the original format issued by the CCME.

Mission Performance Reports (MPR) Mission Performance Reports are issued by CCMEs and provide quality information about one mission, possibly in the context of a specific dataset over a certain period of time.
Product Quality Reports (PQR) Product Quality Reports are issued on a per product basis and provide quality information about a specific product issued for a specific dataset.
Synthesis reports (SYR)

The Synthesis Reports are issued by the CQC Team. These include the analysis of a specific Copernicus dataset against the dataset requirements defined in the related Copernicus Space Component Data Access Portfolio document and the Instrument and pProduct Specifications document issued by the related CCME.

Thereby the purposes of the SYR might be summarised as follows:

  1. Check compliance with Copernicus dataset parameters for all the data included in the dataset.
  2. Check the product format and the quality of imageries for a given sub sample of the whole dataset selected according to predefined strategy.
  3. Assess the product accuracy for a reduced sub sample, compared to the previous one.
A-Posteriori analysis reports (APR)

A-Posteriori analysis reports are issued by CCMEs or by the CQC Team whenever a data quality issue is found.

A-Posterirori analysis reports provide information about the quanomaly and details the outcome of the investigation (e.g. product redelivered, workaround,...)

Auxilliary data files (AUX) Auxilliary data files can be any kind of additional information provided by the CCME (e.g. look-up tables, ground control points, etc).
Post-processing reports (PPR) This quality report type has been unused up until now.

 

The Instrument/Product Specification (IPS) Visualisation Tool allows Copernicus users to further discover, display and compare information about the instruments and products available within the data offer. The IPS Visualisation Tool contains details on a wide range of CCMs, providing assistance with the proper application of their products for the needs of the Copernicus users and also for further data quality assessment.

Using the IPS Visualisation Tool, a user can select any number of parameters corresponding to the mission type (e.g. optical or SAR) that they are interested in and select one or more missions for which information will be displayed. The resulting table provides the parameter for every selected mission and this can also be downloaded and converted to an Excel sheet.

Copernicus users can access the Instrument/Product Specification (IPS) Visualisation Tool using their SSO credentials (for more information refer to the Registration section).