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However, it is common that no freely available DEMs at regional or national level exist. One way to overcome this situation is to use the available free Global Digital Elevation Models (GDEMs). However, these datasets have relatively low spatial resolutions, 30 and 90 meters for ASTER and SRTM, respectively, and it has been shown that their accuracy is relatively low in several regions (e.g., K\u00e4\u00e4b, 2005; Mukul et al., 2017). In this study a methodology is presented to improve the positional accuracy of the drainage networks extracted from the GDEMs using crowdsourced data available in the collaborative project OpenStreetMap (OSM). In this approach only free and global datasets are used, enabling its application to any location of the world. The methodology uses elevation points derived from the GDEMs and the water lines extracted from the collaborative project OSM to generate new DEMs, from which new water lines are obtained. The methodology is applied to two study areas and the positional accuracy of the used data and the obtained results are assessed using reference data.<\/jats:p>","DOI":"10.1515\/johh-2017-0057","type":"journal-article","created":{"date-parts":[[2018,8,14]],"date-time":"2018-08-14T22:16:21Z","timestamp":1534284981000},"page":"285-294","source":"Crossref","is-referenced-by-count":4,"title":["Improving the positional accuracy of drainage networks extracted from Global Digital Elevation Models using OpenstreetMap data"],"prefix":"10.1515","volume":"66","author":[{"given":"Elisabete S.V.","family":"Monteiro","sequence":"first","affiliation":[{"name":"UDI-Research Unit for Inland Development - Polytechnic Institute of Guarda \/ Institute for Systems Engineering and Computers at Coimbra, Av. Dr. Francisco S\u00e1 Carneiro, Guarda , Portugal"}]},{"given":"Cid\u00e1lia C.","family":"Fonte","sequence":"additional","affiliation":[{"name":"Department of Mathematics University of Coimbra \/ Institute for Systems Engineering and Computers at Coimbra, Apartado, Santa Cruz, Coimbra , Portugal"}]},{"given":"Jo\u00e3o L.M.P.","family":"de Lima","sequence":"additional","affiliation":[{"name":"Department of Civil Engineering of University of Coimbra \/ MARE - Marine Environmental Sciences Centre, Faculty of Sciences and Technology, University of Coimbra, P\u00f3lo II University of Coimbra, Coimbra , Portugal"}]}],"member":"374","published-online":{"date-parts":[[2018,8,14]]},"reference":[{"key":"2021040700323097825_j_johh-2017-0057_ref_001_w2aab3b7b2b1b6b1ab1ab1Aa","unstructured":"Al-Bakri, M., Fairbairn, D., 2010. Assessing the accuracy of \u2018Crowdsourced\u2019 data and its integration with official spatial data sets. In: Proc. Symp. Accuracy 2010. 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