Usability of time-lapse digital camera images to detect characteristics of tree phenology in a tropical rainforest
作者： Shin Nagai , Tomoaki Ichie , Aogu Yoneyama , Hideki Kobayashi , Tomoharu Inoue
DOI: 10.1016/J.ECOINF.2016.01.006
关键词:
摘要: Abstract We evaluated the usability of red (R), green (G), and blue (B) digital numbers (DNRGB) extracted from daily phenological images a tropical rainforest in Malaysian Borneo. examined temporal patterns proportions DNR, DNG, DNB as percentages total DN (denoted %R, %G %B), hue, saturation, lightness values HSL color model, excess index (GEI) whole canopy individual trees for 2 years. also red, green, reflectance surface %ref_R, %ref_G, %ref_B), vegetation indices (the normalized-difference index, enhanced green–red index) by using measurements quantum sensors. The %RGB saturation revealed characteristics tree phenology caused flowering, coloring, leaf flushing. In contrast, those did not, nor or %ref_B, indices. GEI, however, could detect differences among flushing coloring. Our results show importance installing multiple time-lapse cameras rainforests to accurately evaluate sensitivity meteorological climatic changes. However, more work needs be done adequately describe whole-canopy
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