“…Flickr data can be used to find out the number of trips made, visit frequencies, and to identify tourist sites with certain types of views (Popescu, Grefenstette, & Moëllic, 2009). In a study conducted in Berlin, heatmaps and route similarity clustering were used to show the density of destinations across the city (Gavric, Culibrk, Lugonja, Mirkovic, & Crnojevic, 2011). In another study, density maps were used to visualize attractive areas and clusters of destinations (Kisilevich, Krstajic, Keim, Andrienko, & Andrienko, 2010).…”