Sensor Performances, Product and Algorithm The evolution of Quality Assurance Toward GMES
Lecomte, Pascal
ESA

Sensor Performance, Product Quality Assessment and Algorithm development, maintenance and evolution (SPPA) are major element of any space borne Earth Observation Mission. These activities are the major objective of the commissioning phases but routine activities shall be maintained during the whole mission in order to maintain the quality of the product delivered to the users or at least to fully characterise the evolution with time of the product quality. With the launch of ERS-1 in 1991, the European Space Agency decided to put in place a group dedicated to these activities, along with the daily monitoring of the product quality for anomaly detection and algorithm evolution. These four elements are all strongly linked together. Today this group is fully responsible for the monitoring of two ESA missions, ERS-2 and Envisat, for a total of 12 instruments of various types, preparing itself for the Earth Explorer series of five other satellites (Cryosat, Goce, SMOS, ADM-Aeolus, Swarm) and at various levels in past and future Third Party Missions such as Landsat, J-ERS and ALOS. The Joint proposal by the European Union and the European Space Agency for a ‘Global Monitoring for Environment and Security’ project (GMES), triggers a review of the scope of these activities in a much wider framework than the handling of single missions with specific tools, methods and activities. Because of the global objective of this proposal, it is necessary to put in place new SPPA concepts and procedures. GMES SPPA activities will rely on multi source data access, interoperability, long-term data preservation, and definition standards to facilitate the above objectives. The scope of this presentation is to give an overview of the current SPPA activities at ESA, the status of Envisat activities after 5 years of operations and the planned evolution in the context of GMES.