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| 1 | Exploring the depths of the global earth observation system of systems显示文摘This paper explores for the first time the contents,structure and relationships across institutions and disciplines of a global Big Earth Data cyber-infrastructure:the Global Earth Observation System of System(GEOSS).The analysis builds on 1.8 million metadata records harvested in GEOSS.Because this set includes almost all the major large data collections in GEOSS,the analysis represents more than 80%of all the data made available through this global system.We explore two major aspects:the collaborative networks and the thematic coverage in GEOSS.The first connects the contributing organisations through the more than 200,000 keywords used in the systems,and then explores who is citing whom,a proxy for of institutional thickness.The thematic coverage is analysed through neural network algorithms,first on the keywords,and then on the corpus of 653 million lemmatised lower case words built from the titles and abstracts of all 1.8 million metadata records.The findings not only give a good overview of the GEOSS data universe,but offer immediate priorities on how to increase the usability of GEOSS through improved data management,and the opportunity to augment the metadata with high level concept that synthetise well the contents of the data-set. | Max Craglia Jiri Hradec Stefano Nativi Mattia Santoro | 2017 | Big Earth Data2017，1，1： | 5 |
| 2 | Chronic sclerosing ureteritis and nephrogenic adenoma of the ureter in analgesic abuse 显示文摘 | Marek J Hradec E | 1985 | Pathol Res Pract1985，180，5： | 1 |
| 3 | Valsartan and atenolol in patients with essential hypertension显示文摘 | Cifkova R Peleska J Hradec J | 1998 | J Hum Hypertens1998，12，8： | 1 |
| 4 | Isolation and quantitation of PC by reversed-phase liquidliquid extraction显示文摘 | Hradec J | 1997 | J of Chromatography B1997，703，： | 1 |
| 5 | Anti-ischemic efficacy and tolerability of trimetazidine administered to patients with angina pectoris: results of three studies 显示文摘 | Szwed H Hradec J Preda I | 2001 | Coron Artery Dis2001，12，1： | 1 |
| 6 | Post hoc analysis of the Cluster Randomized Usual Care versus Caduet In- vestigation Assessing Long-term risk (CRUCIAL) trial显示文摘 | HRADEC J ZAMORANO J SUTRADHAR S | 2013 | CurrMed Res Opin2013，29，6： | 1 |
| 7 | Isolation and quantitation of PC by reversed-phase liquid-liquid extraction显示文摘 | Hradec | 1997 | Journal of Chromatography B1997，703，： | 1 |
| 8 | To treat or not to treat with statins patients with chronic heart failure 显示文摘 | Hradec J | 2009 | Vnitr LeL2009，55，9： | 1 |
| 9 | Valsartan and atenolol in patients with severe essential hypertension 显示文摘 | Cifkova R Peleska J Hradec J | 1998 | J Hum Hypertens1998，12，： | 1 |
| 10 | Isolation and quantitation of phosphatidylcholine by reversed-phase liquid–liquid extraction显示文摘 | Jan Hradec Petr Dufek | 1997 | Journal of Chromatography B: Biomedical Sciences and Applications1997，，1： | 1 |
| 11 | Valsartan and at_ enolol in patients with severe essential hypertensien显示文摘 | Cifkova R Peleska J Hradec J | 1998 | J Hum Hypertens1998，12，8： | 1 |
| 12 | Isolation and quantitation of PC by reversed - phase liquid - liquid extraction 显示文摘 | HRADEC | 1997 | Journal of Chromatography B1997，703，： | 1 |
| 13 | Heart disease Ⅰ n acromegaly显示文摘 | Hradec J Kral J Janota T | 1995 | Sb-Lek1995，96，： | 1 |
| 14 | GEOSS Platform data content and use显示文摘The GEOSS Platform is a key contribution to the goal of building the Global Earth Observation System of Systems(GEOSS).It enables a harmonized discovery and access of Earth observation data,shared online by heterogeneous organizations worldwide.This work analyzes both what is made available in the GEOSS Platform by the data providers and how users are utilizing it including multiyear trends,updating a previous analysis published in 2017.The present statistics derive from a 2021 EOValue report funded by the European Commission.The offer of GEOSS Platform data has been the object of various analyses,including data provider characterization,data sharing trends,and data characterization(comprising metadata quality analysis,thematic analysis,responsible party identification,spatial–temporal coverage).GEOSS data demand has also been the object of several analyses,including data consumer characterization,utilization trends,and requested data characterization(comprising thematic analysis,spatial–temporal coverage,and popularity).Among thefindings,a large amount of shared data,mostly from satellite sources,emerges with an issue of low metadata quality and related discovery match.Moreover,the trend in usage is decreasing.Therefore,the progressive disconnection of the GEOSS platform from its data Providers and Users and other possible causes are also reported. | Enrico Boldrini Stefano Nativi Jiri Hradec Mattia Santoro Paolo Mazzetti Max Craglia | 2023 | International Journal of Digital Earth2023，16，1： | 0 |
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