The GGOS as the backbone for global observing and local monitoring: A user driven perspective |
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| Institution: | 1. State Key Laboratory of Geodesy and Earth''s Dynamics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan 430077, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;1. UMR 7266 LIENSS, Université de La Rochelle – CNRS, 2 rue Olympe de Gouge, 17000 La Rochelle, France;2. CNRM/CMM, Météo-France, 13 rue du Chatellier, 29228 Brest, France;3. IMEDEA (CSIC-UIB), Miquel Marquès, 07190 Esporles, Spain;4. Instituto Geográfico Nacional, Cerro de la Palera, s/n, 19141 Yebes, Spain;1. School of Geodesy and Geomatics, Wuhan University, 129 Luoyu Road, Wuhan 430079, China;2. Key Laboratory of Geospace Environment and Geodesy, Ministry of Education, Wuhan University, 129 Luoyu Road, Wuhan 430079, China;1. Institute of Geodesy and Geoinformation, University of Bonn, 53115 Bonn, Germany;2. Image Processing Laboratory (IPL) - Laboratory of Earth Observation (LEO), University of Valencia, Valencia, Spain;3. Lantmäteriet, 801 82 Gävle, Sweden |
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| Abstract: | A key geodetic contribution to both the three Global Observing Systems and initiatives like the European Global Monitoring for Environment and Security is an accurate, long-term stable, and easily accessible reference frame as the backbone. Many emerging scientific as well as non-scientific high-accuracy applications require access to an unique, technique-independent reference frame decontaminated for short-term fluctuations due to global Earth system processes. Such a reference frame can only be maintained and made available through an observing system such as the Global Geodetic Observing System (GGOS), which is currently implemented and expected to provide sufficient information on changes in the Earth figure, its rotation and its gravity field. Based on a number of examples from monitoring of infrastructure, point positioning, maintenance of national references frames to global changes studies, likely future accuracy requirements for a global terrestrial reference frame are set up as function of time scales. Expected accuracy requirements for a large range of high-accuracy applications are less than 5 mm for diurnal and sub-diurnal time scales, 2–3 mm on monthly to seasonal time scales, better than 1 mm/year on decadal to 50 years time scales. Based on these requirements, specifications for a geodetic observing system meeting the accuracy requirements can be derived. |
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