Discovering multiple HotSpots using geo-tagged photographs. - Motohiro Shirai; Masaharu Hirota; Shohei Yokoyama; Naoki Fukuta; Hiroshi Ishikawa 004 (SIGSPATIAL/GIS, 2012)

A method of Area of Interest and Shooting Spot Detection using Geo-tagged Photographs. - Motohiro Shirai; Masaharu Hirota; Hiroshi Ishikawa 004; Shohei Yokoyama (COMP@SIGSPATIAL, 2013)

Detecting Relations of Hotspots using Geo-tagged Photographs in Social Media Sites. - Masaharu Hirota; Motohiro Shirai; Hiroshi Ishikawa 004; Shohei Yokoyama (GeoRich@SIGMOD, 2014)