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Volunteered geographical information represents a promising field in themonitoring and mapping of natural disasters. The contributors of volunteeredgeographical information have the advantage that they are at the location ofthe natural disaster at exactly the time when the disaster happened.Therefore, they can provide the most complete account of the extent of thedamage. This is not always possible when applying photogrammetric orremote-sensing methods, as prior to the data acquisition an order to carryout the measurements has to be made. On 5 and 6 November 2012 almost half ofSlovenia was badly affected by floods. The gathering of volunteeredgeographical information in the form of images and videos of these floods ispresented. Two strategies were used: (1) a public call for volunteeredcontributions and (2) a web search for useful images and their authors. Theauthorship of these images was verified with every contributor. In total, 15contributors provided 102 terrestrial and aerial images and one aerial video,with 45% classified as potentially useful. For actual flood mapping 22images and 12 sequences from video were used. With the help of thevolunteered images 12% of the most severely affected river sections weremapped. Altogether, 1195.3 ha of flooded areas outside of the usualriver beds along a total river length of 48 km were mapped. Theresults are compared with those from satellite mapping of the same floods,which successfully covered 18% of the most affected river sections

Using volunteered geographical information to map the November 2012 floods in Slovenia