{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,28]],"date-time":"2025-10-28T05:29:04Z","timestamp":1761629344736},"reference-count":28,"publisher":"IGI Global","issue":"3","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2014,7,1]]},"abstract":"<p>Volunteered Geographic Information has become exponentially available over the Web in the last years. This availability can hide a vast geographical richness and provides us with both a great opportunity to explore new ways to use it and also big challenges related with its unstructured nature. This paper conducts a preliminary analysis of the adequacy of photos from the Flickr and Panoramio initiatives in order to use them as a source of field data in the quality control of the Land Use\/Cover databases production. It evaluates its temporal and spatial distributions over Continental Portugal and also its distribution over Land Use\/Cover classes using as a reference the European Corine Land Cover database. It concludes that this source is very valuable but needs to be combined with other sources due to its uneven spatial distribution.<\/p>","DOI":"10.4018\/ijaeis.2014070105","type":"journal-article","created":{"date-parts":[[2014,10,6]],"date-time":"2014-10-06T16:49:05Z","timestamp":1412614145000},"page":"73-89","source":"Crossref","is-referenced-by-count":10,"title":["Photo Based Volunteered Geographic Information Initiatives"],"prefix":"10.4018","volume":"5","author":[{"given":"Jacinto","family":"Estima","sequence":"first","affiliation":[{"name":"ISEGI, Universidade Nova de Lisboa, Lisboa, Portugal"}]},{"given":"Marco","family":"Painho","sequence":"additional","affiliation":[{"name":"ISEGI, Universidade Nova de Lisboa, Lisboa, Portugal"}]}],"member":"2432","reference":[{"key":"ijaeis.2014070105-0","doi-asserted-by":"publisher","DOI":"10.1080\/19475681003700831"},{"key":"ijaeis.2014070105-1","unstructured":"Caetano, M., Mata, F., & Freire, S. (2006). 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(2009). Assessment of the status of the development of the standards for the Terrestrial Essential Climate Variables. Technical report. Rome: Technical report. Retrieved from http:\/\/www.fao.org\/gtos\/doc\/ECVs\/T09\/T09.pdf"},{"key":"ijaeis.2014070105-17","doi-asserted-by":"publisher","DOI":"10.1177\/0894439309332299"},{"key":"ijaeis.2014070105-18","doi-asserted-by":"publisher","DOI":"10.1080\/17489720902950366"},{"key":"ijaeis.2014070105-19","doi-asserted-by":"publisher","DOI":"10.1109\/IV.2010.94"},{"key":"ijaeis.2014070105-20","unstructured":"Kuhn, W. (2007). Volunteered Geographic Information and GIScience. In Workshop on Volunteered Geographic Information. Santa Barbara, CA. 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