Figure 6

Screen shots of Web application interface.(a) shows screen shots of the “snow” observation application that we have implemented, (b) shows screen shots of the “rain” observation application that we have implemented. The Web application interface consists of four components: a map, a ranking table, a chart of bursts, and tag cloud. Icons, which indicate extracted bursty areas, are mapped on the map. If users click an icon, markers, which represents geotagged tweets located in the extracted bursty area are appeared. If the users click each marker, a window including the text data of geotagged tweet is opened. The ranking table is a ranking list of extracted bursty areas. Extracted bursty area are ranked by increasing rate of the number of geotagged tweets. An additional movie file shows this in more detail [see Additional file 1].