H
Hiroyuki Oguma
Researcher at National Institute for Environmental Studies
Publications - 110
Citations - 1921
Hiroyuki Oguma is an academic researcher from National Institute for Environmental Studies. The author has contributed to research in topics: Lidar & Vegetation (pathology). The author has an hindex of 22, co-authored 105 publications receiving 1666 citations. Previous affiliations of Hiroyuki Oguma include National Space Development Agency of Japan & University of Tokyo.
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Journal ArticleDOI
Applicability of Green-Red Vegetation Index for Remote Sensing of Vegetation Phenology
TL;DR: It is found that “GRVI = 0” can be a site-independent single threshold for detection of the early phase of leaf green-up and the middle phase of autumn coloring, and GRVI can show a distinct response to subtle disturbance and the difference of ecosystem types.
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Use of digital cameras for phenological observations
Reiko Ide,Hiroyuki Oguma +1 more
TL;DR: The results suggest the utility of digital cameras for phenological observations at precise temporal and spatial resolutions, despite a year-to-year drift of color balance of camera as a technical device.
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Seasonal changes in the relationship between photochemical reflectance index and photosynthetic light use efficiency of Japanese larch needles
TL;DR: Although diurnal change in LUE cannot be estimated quantitatively from PRI on its own throughout the growing season, the combined use of PRI and other variables such as foliar pigments or NDVI could improve the remote evaluation of seasonal changes in Lue of deciduous tree leaves.
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Estimating the plant area density of a Japanese larch (Larix kaempferi Sarg.) plantation using a ground-based laser scanner
TL;DR: In this article, a ground-based laser scanner consisting of a laser range finder and two rotation stages was used to determine the 3D distribution of plant area density (PAD) in Japanese larch plantations.
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Change in CO2 balance under a series of forestry activities in a cool‐temperate mixed forest with dense undergrowth
Kentaro Takagi,Karibu Fukuzawa,Naishen Liang,Masazumi Kayama,Mutsumi Nomura,Hajime Hojyo,Sadao Sugata,Hideaki Shibata,Tatsuya Fukazawa,Yoshiyuki Takahashi,Tatsuro Nakaji,Hiroyuki Oguma,Masayoshi Mano,Yukio Akibayashi,Takeshi Murayama,Takayoshi Koike,Kaichiro Sasa,Yasumi Fujinuma +17 more
TL;DR: In this paper, the effects on CO2 exchange of clearcutting a mixed forest and replacing it with a plantation were evaluated in a conifer-broadleaf mixed forest in Hokkaido, Japan.