In order to ensure the proper knowledge of the data content, Quality Assurance for Earth Observation (QA4EO) principles have been developed QA4EO has been endorsed by the Committee on Earth Observation Systems (CEOS) as a contribution to facilitate the GEO (Group on Earth Observation). spaceborne, airborne, in-situ networks) can be combined into coherent data sets. The Earthnet TPMs, together with the ESA missions, contribute to the Global Earth Observation System of Systems (GEOSS) GEOSS will provide decision-support tools to a wide variety of users and will promote common technical standards so that data from different instrumentations (e.g. The Earthnet support to TPMs can be divided in two types of activities support to TPM cal/val and routine data quality monitoring, and TPM data supply for science and research purposes. 50% of those missions are of European origin, the other 50% are international, mainly from Canada, US, Japan, India, South Korea. Earthnet has continuously integrated an increasing number of TPMs, at a constant level of funding: in the current Earthnet Phase, data from 28 missions with 56 individual satellites (historic and operational missions) have been maintained, transferred where relevant to Long Term Data Preservation (LTDP) and made available to users. The European Space Agency Earthnet Programme provides the framework that was first established in 1977 for “integrating” non-ESA missions (Third Party Mission - TPM) into the overall ESA Earth Observation (EO) portfolio, allowing data access and supporting the development of new research and applications. Important multi-mission aspects will also be presented for studies that will require inputs from several missions, possibly spanning multiple instrument domains such studies contribute to interoperability across existing and future missions and help foster synergies between these missions. This work presents how the EDAP activities are organized and executed, and will also provide details of the various missions included within each of the instrument-specific domains covering Optical Sensors, Synthetic Aperture Radar (SAR) and Atmospheric missions. Complementary to this support is a focus on the generation of methodologies and guidelines for training and capacity building with each mission provider in regards to performing efficient data quality assessments in preparation for future missions. The EDAP consortium, headed by Telespazio VEGA UK is aimed at the provision of various clusters of expertise to perform an early data quality assessment of existing or future EO missions from national or commercial providers, which may potentially become TPMs within ESA’s Earthnet Programme. This project is known as the Earthnet Data Assessment Pilot (EDAP). Some of these new missions are potential candidates for Earthnet TPMs, and ESA have therefore set up a project to assess the quality and the suitability of these missions and also to establish dialogues with the various mission providers in order to improve the overall coherence of the EO system. These New Space players are now portraying an important role in the EO international strategy. In recent years the availability of low cost small satellites and the innovation of constellations resulted in an increased number of commercial companies who have established business models to provide information services fed by their own satellite systems. In line with the Earthnet Programme objectives first established in 1977, ESA aims to foster cooperation and collaboration with not only other national space agencies, but also commercial mission providers. Complementary to ESA-owned EO missions, the programme allows European users access to a large portfolio of TPM and is particularly important for promoting the international use of EO data. Third Party Missions (TPM), into the overall ESA Earth Observation (EO) strategy. This role involved providing the framework for integrating non-ESA missions, i.e. For over 40 years ESA’s Earthnet Programme has played a significant role as part of ESA’s mandatory activities, being a major contributor to the Global Earth Observation System of Systems (GEOSS).
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