Utility of information in photographs taken upwards from the floor of closed-canopy deciduous broadleaved and closed-canopy evergreen coniferous forests for continuous observation of canopy phenology. - Shin Nagai; Taku M. Saitoh; Nam Jin Noh; Tae Kyung Yoon; Hideki Kobayashi; Rikie Suzuki; Kenlo Nishida Nasahara; Yowhan Son; Hiroyuki Muraoka (Ecol. Informatics, 2013)