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- Guerova, G., et al.
(författare)
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National Status Reports
- 2020
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Ingår i: Advanced GNSS Tropospheric Products for Monitoring Severe Weather Events and Climate. - Cham : Springer International Publishing. - 9783030139001 ; , s. 403-481
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Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
- In this section a summary of the national progress reports is given. GNSS4SWEC Management Committee (MC) members provided outline of the work conducted in their countries combining input from different partners involved. In the COST Action paticipated member from 32 COST countries, 1 Near Neighbour Country and 8 Intrantional Partners from Australia, Canada, Hong Kong and USA. The text reflects the state as of 1 January 2018.
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| 5. |
- Ning, Tong, 1975, et al.
(författare)
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The uncertainty of the atmospheric integrated water vapour estimated from GNSS observations
- 2016
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Ingår i: Atmospheric Measurement Techniques. - : Copernicus GmbH. - 1867-1381 .- 1867-8548. ; 9:1, s. 79-92
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Tidskriftsartikel (refereegranskat)abstract
- Within the Global Climate Observing System (GCOS) Reference Upper-Air Network (GRUAN) there is a need for an assessment of the uncertainty in the integrated water vapour (IWV) in the atmosphere estimated from ground-based global navigation satellite system (GNSS) observations. All relevant error sources in GNSS-derived IWV are therefore essential to be investigated. We present two approaches,a statistical and a theoretical analysis, for the assessmentof the uncertainty of the IWV. The method is valuable for all applications of GNSS IWV data in atmospheric research and weather forecast. It will be implemented to theGNSS IWV data stream for GRUAN in order to assign aspecific uncertainty to each data point. In addition, specific recommendations are made to GRUAN on hardware, software,and data processing practices to minimise the IWV uncertainty. By combining the uncertainties associated with the input variables in the estimations of the IWV, we calculated the IWV uncertainties for several GRUAN sites with different weather conditions. The results show a similar relative importance of all uncertainty contributions where the uncertainties in the zenith total delay (ZTD) dominate the error budget of the IWV, contributing over 75% of the total IWV uncertainty. The impact of the uncertainty associated with the conversion factor between the IWV and the zenith wet delay (ZWD) is proportional to the amount of water vapour and increases slightly for moist weather conditions. The GRUAN GNSS IWV uncertainty data will provide a quantified confidence to be used for the validation of other measurement techniques.
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| 6. |
- Wickert, J, et al.
(författare)
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GNSS for Global Earth Observation: The European coordination action Gfg²
- 2012
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Ingår i: Sixth FORMOSAT-3/COSMIC Data Users' Workshop 30 October - 1 November 2012, Boulder, Colorado U.S.A..
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- The Gfgsquared (GfG²) project is an international research related project with focus to the use of GNSS (Global Navigation Satellite Systems) for Earth Observation in a more general sense. Within the project novel GNSS applications with outstanding social importance are identified. These applications can be classified by the nine Social Benefit Areas (SBA), which address the current crucial problems of mankind: disasters, health, energy, climate, water, weather, ecosystems, agriculture, biodiversity (see www.earthobservation.org). We give examples for GNSS applications in the different SBA. For several of these applications, GNSS radio occultation is a key observation technique with several applications in that context.
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| 7. |
- Elgered, Gunnar, 1955, et al.
(författare)
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GNSS for global environmental Earth observation
- 2013
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Bok (övrigt vetenskapligt/konstnärligt)abstract
- This booklet is produced within the Gfg2 project, a three year coordination action, funded by the 7th Framework Program of the European Commission under the Environment theme. Its mission is to better assess the value of Global Navigational Satellite Systems (GNSS) for Global Environmental Earth Observation (GEEO) and GEOSS.
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| 8. |
- Elgered, Gunnar, 1955, et al.
(författare)
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GNSS för globala jordobservationer
- 2014
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Bok (övrigt vetenskapligt/konstnärligt)abstract
- Detta häfte har producerats av Gfg2-projektet, en treårig koordineringsaktivitet finansierad av Europeiska kommissionens sjunde ramprogram inom dess miljötema. Projektets uppgift är att belysa värdet av jordobservationer med hjälp av globala navigationssystem (GNSS = Global Navigational Satellite Systems) för Global Environmental Earth Observation (GEEO) och Global Earth Observation System of Systems (GEOSS).
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