DOI: 10.1016/j.jag.2017.05.016
Scopus记录号: 2-s2.0-85032222922
论文题名: Using ground observations of a digital camera in the VIS-NIR range for quantifying the phenology of Mediterranean woody species
作者: Weil G ; , Lensky I ; M ; , Levin N
刊名: International Journal of Applied Earth Observation and Geoinformation
ISSN: 15698432
出版年: 2017
卷: 62 起始页码: 88
结束页码: 101
语种: 英语
英文关键词: Classification
; Digital camera
; Mediterranean
; Phenology
; Remote sensing
; Tree species
Scopus关键词: deciduous tree
; digital image
; evergreen tree
; feasibility study
; ground-based measurement
; herb
; near infrared
; phenology
; remote sensing
; vegetation cover
英文摘要: The spectral reflectance of most plant species is quite similar, and thus the feasibility of identifying most plant species based on single date multispectral data is very low. Seasonal phenological patterns of plant species may enable to face the challenge of using remote sensing for mapping plant species at the individual level. We used a consumer-grade digital camera with near infra-red capabilities in order to extract and quantify vegetation phenological information in four East Mediterranean sites. After illumination corrections and other noise reduction steps, the phenological patterns of 1839 individuals representing 12 common species were analyzed, including evergreen trees, winter deciduous trees, semi-deciduous summer shrubs and annual herbaceous patches. Five vegetation indices were used to describe the phenology: relative green and red (green\red chromatic coordinate), excess green (ExG), normalized difference vegetation index (NDVI) and green-red vegetation index (GRVI). We found significant differences between the phenology of the various species, and defined the main phenological groups using agglomerative hierarchical clustering. Differences between species and sites regarding the start of season (SOS), maximum of season (MOS) and end of season (EOS) were displayed in detail, using ExG values, as this index was found to have the lowest percentage of outliers. An additional visible band spectral index (relative red) was found as useful for characterizing seasonal phenology, and had the lowest correlation with the other four vegetation indices, which are more sensitive to greenness. We used a linear mixed model in order to evaluate the influences of various factors on the phenology, and found that unlike the significant effect of species and individuals on SOS, MOS and EOS, the sites' location did not have a direct significant effect on the timing of phenological events. In conclusion, the relative advantage of the proposed methodology is the exploitation of representative temporal information that is collected with accessible and simple devices, for the subsequent determination of optimal temporal acquisition of images by overhead sensors, for vegetation mapping over larger areas. © 2017 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/80004
Appears in Collections: 气候变化事实与影响
There are no files associated with this item.
作者单位: Department of Geography, Hebrew University of Jerusalem, Jerusalem, Israel; Israel Nature and Parks Authority, Am ve Olamo 3, Jerusalem, Israel; Department of Geography and Environment, Bar Ilan University, Ramat Gan, Israel
Recommended Citation:
Weil G,, Lensky I,M,et al. Using ground observations of a digital camera in the VIS-NIR range for quantifying the phenology of Mediterranean woody species[J]. International Journal of Applied Earth Observation and Geoinformation,2017-01-01,62