{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,6]],"date-time":"2026-05-06T19:55:48Z","timestamp":1778097348161,"version":"3.51.4"},"reference-count":92,"publisher":"MDPI AG","issue":"5","license":[{"start":{"date-parts":[[2016,4,27]],"date-time":"2016-04-27T00:00:00Z","timestamp":1461715200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["IJGI"],"abstract":"<jats:p>Citizens are increasingly becoming an important source of geographic information, sometimes entering domains that had until recently been the exclusive realm of authoritative agencies. This activity has a very diverse character as it can, amongst other things, be active or passive, involve spatial or aspatial data and the data provided can be variable in terms of key attributes such as format, description and quality. Unsurprisingly, therefore, there are a variety of terms used to describe data arising from citizens. In this article, the expressions used to describe citizen sensing of geographic information are reviewed and their use over time explored, prior to categorizing them and highlighting key issues in the current state of the subject. The latter involved a review of ~100 Internet sites with particular focus on their thematic topic, the nature of the data and issues such as incentives for contributors. This review suggests that most sites involve active rather than passive contribution, with citizens typically motivated by the desire to aid a worthy cause, often receiving little training. As such, this article provides a snapshot of the role of citizens in crowdsourcing geographic information and a guide to the current status of this rapidly emerging and evolving subject.<\/jats:p>","DOI":"10.3390\/ijgi5050055","type":"journal-article","created":{"date-parts":[[2016,4,27]],"date-time":"2016-04-27T12:22:05Z","timestamp":1461759725000},"page":"55","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":329,"title":["Crowdsourcing, Citizen Science or Volunteered Geographic Information? The Current State of Crowdsourced Geographic Information"],"prefix":"10.3390","volume":"5","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2665-7065","authenticated-orcid":false,"given":"Linda","family":"See","sequence":"first","affiliation":[{"name":"International Institute for Applied Systems Analysis (IIASA), Schlossplatz 1, Laxenburg A2361, Austria"}]},{"given":"Peter","family":"Mooney","sequence":"additional","affiliation":[{"name":"Department of Computer Science, Maynooth University, Maynooth W23 F2H6, Ireland"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6464-3054","authenticated-orcid":false,"given":"Giles","family":"Foody","sequence":"additional","affiliation":[{"name":"School of Geography, University of Nottingham, Nottingham NG7 2RD, UK"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1321-0800","authenticated-orcid":false,"given":"Lucy","family":"Bastin","sequence":"additional","affiliation":[{"name":"School of Engineering and Applied Science, Aston University, Birmingham B4 7ET, UK"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3652-7846","authenticated-orcid":false,"given":"Alexis","family":"Comber","sequence":"additional","affiliation":[{"name":"School of Geography, University of Leeds, Leeds LS2 9JT, UK"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8837-4637","authenticated-orcid":false,"given":"Jacinto","family":"Estima","sequence":"additional","affiliation":[{"name":"NOVA IMS, Universidade Nova de Lisboa (UNL), 1070-312 Lisboa, Portugal"}]},{"given":"Steffen","family":"Fritz","sequence":"additional","affiliation":[{"name":"International Institute for Applied Systems Analysis (IIASA), Schlossplatz 1, Laxenburg A2361, Austria"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4513-4681","authenticated-orcid":false,"given":"Norman","family":"Kerle","sequence":"additional","affiliation":[{"name":"Department of Earth Systems Analysis, ITC\/University of Twente, Enschede 7500 AE, The Netherlands"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2337-2486","authenticated-orcid":false,"given":"Bin","family":"Jiang","sequence":"additional","affiliation":[{"name":"Faculty of Engineering and Sustainable Development, Division of GIScience, University of G\u00e4vle, G\u00e4vle 80176, Sweden"}]},{"given":"Mari","family":"Laakso","sequence":"additional","affiliation":[{"name":"Finnish Geospatial Research Institute, Kirkkonummi 02430, Finland"}]},{"given":"Hai-Ying","family":"Liu","sequence":"additional","affiliation":[{"name":"Norwegian Institute for Air Research (NILU), Kjeller 2027, Norway"}]},{"given":"Grega","family":"Mil\u010dinski","sequence":"additional","affiliation":[{"name":"Sinergise Ltd., Cvetkova ulica 29, Ljubljana SI-1000, Slovenia"}]},{"given":"Matej","family":"Nik\u0161i\u010d","sequence":"additional","affiliation":[{"name":"Urban Planning Institute of the Republic of Slovenia, Ljubljana SI-1000, Slovenia"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1136-3387","authenticated-orcid":false,"given":"Marco","family":"Painho","sequence":"additional","affiliation":[{"name":"NOVA IMS, Universidade Nova de Lisboa (UNL), 1070-312 Lisboa, Portugal"}]},{"given":"Andrea","family":"P\u0151d\u00f6r","sequence":"additional","affiliation":[{"name":"Institute of Geoinformatics, \u00d3buda University Alba Regia Technical Faculty, Sz\u00e9kesfeh\u00e9rv\u00e1r 8000, Hungary"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1101-1333","authenticated-orcid":false,"given":"Ana-Maria","family":"Olteanu-Raimond","sequence":"additional","affiliation":[{"name":"Universit\u00e9 Paris-Est, IGN-France, COGIT Laboratory, Saint-Mand\u00e9, Paris 94165, France"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6628-4681","authenticated-orcid":false,"given":"Martin","family":"Rutzinger","sequence":"additional","affiliation":[{"name":"Institute for Interdisciplinary Mountain Research, Austrian Academy of Sciences, Technikerstr. 21a, Innsbruck A6020, Austria"}]}],"member":"1968","published-online":{"date-parts":[[2016,4,27]]},"reference":[{"key":"ref_1","first-page":"874","article-title":"Hacker cartography: Crowdsourced geography, OpenStreetMap, and the hacker political imaginary","volume":"14","author":"McConchie","year":"2015","journal-title":"ACME Int. 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