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They are generally developed to facilitate collaboration within one or more communities through reusable datasets, analysis tools, and interactive visualizations. Open Data Observatories collect and integrate various data from multiple disparate data sources\u2014some providing mechanisms to support real-time data capture and ingest. Data types can include sensor data (soil, weather, traffic, pollution levels) and satellite imagery. Data sources can include Open Data providers, interconnected devices, and services offered through the Internet of Things. The continually increasing volume and variety of such data require timely integration, management, and analysis, yet presented in a way that end-users can easily understand. Data released for open access preserve their value and enable a more in-depth understanding of real-world choices. This survey compares 13 Open Data Observatories and their data management approaches\u2014investigating their aims, design, and types of data. We conclude with research challenges that influence the implementation of these observatories, outlining some strengths and limitations for each one and recommending areas for improvement. Our goal is to identify best practices learned from the selected observatories to aid the development of new Open Data Observatories.<\/jats:p>","DOI":"10.1145\/3705863","type":"journal-article","created":{"date-parts":[[2024,11,25]],"date-time":"2024-11-25T10:53:39Z","timestamp":1732532019000},"page":"1-28","update-policy":"https:\/\/doi.org\/10.1145\/crossmark-policy","source":"Crossref","is-referenced-by-count":3,"title":["A Comparison of Open Data Observatories"],"prefix":"10.1145","volume":"17","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2998-5056","authenticated-orcid":false,"given":"Naeima","family":"Hamed","sequence":"first","affiliation":[{"name":"Cardiff School of Computer Science &amp; Informatics, Cardiff University, Cardiff, United Kingdom of Great Britain and Northern Ireland"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3597-2646","authenticated-orcid":false,"given":"Omer","family":"Rana","sequence":"additional","affiliation":[{"name":"Cardiff School of Computer Science &amp; Informatics, Cardiff University, Cardiff, United Kingdom of Great Britain and Northern Ireland"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7951-4148","authenticated-orcid":false,"given":"Pablo","family":"Orozco-terWengel","sequence":"additional","affiliation":[{"name":"Cardiff School of Biosciences, Cardiff University, Cardiff, United Kingdom of Great Britain and Northern Ireland"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2360-4643","authenticated-orcid":false,"given":"Beno\u00eet","family":"Goossens","sequence":"additional","affiliation":[{"name":"Cardiff School of Biosciences, Cardiff University, Cardiff, United Kingdom of Great Britain and Northern Ireland"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0190-3346","authenticated-orcid":false,"given":"Charith","family":"Perera","sequence":"additional","affiliation":[{"name":"Cardiff School of Computer Science &amp; Informatics, Cardiff University, Cardiff, United Kingdom of Great Britain and Northern Ireland"}]}],"member":"320","published-online":{"date-parts":[[2025,3,18]]},"reference":[{"key":"e_1_3_3_2_2","doi-asserted-by":"publisher","DOI":"10.1007\/s10209-018-0618-4"},{"key":"e_1_3_3_3_2","first-page":"203","volume-title":"15th International Conference on Theory and Practice of Electronic Governance (ICEGOV \u201922)","author":"Ali Mohsan","year":"2022","unstructured":"Mohsan Ali, Charalampos Alexopoulos, and Yannis Charalabidis. 2022. 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