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http://dx.doi.org/10.7780/kjrs.2020.36.5.1.7

Diurnal Change of Reflectance and Vegetation Index from UAV Image in Clear Day Condition  

Lee, Kyung-do (Climate Change and Agro-Ecology Division, National Institute of Agricultural Sciences, Rural Development Administration)
Na, Sang-il (Climate Change and Agro-Ecology Division, National Institute of Agricultural Sciences, Rural Development Administration)
Park, Chan-won (Climate Change and Agro-Ecology Division, National Institute of Agricultural Sciences, Rural Development Administration)
Hong, Suk-young (Climate Change and Agro-Ecology Division, National Institute of Agricultural Sciences, Rural Development Administration)
So, Kyu-ho (Climate Change and Agro-Ecology Division, National Institute of Agricultural Sciences, Rural Development Administration)
Ahn, Ho-yong (Climate Change and Agro-Ecology Division, National Institute of Agricultural Sciences, Rural Development Administration)
Publication Information
Korean Journal of Remote Sensing / v.36, no.5_1, 2020 , pp. 735-747 More about this Journal
Abstract
Recent advanced UAV (Unmanned Aerial Vehicle) technology supply new opportunities for estimating crop condition using high resolution imagery. We analyzed the diurnal change of reflectance and NDVI (Normalized Difference Vegetation Index) in UAV imagery for crop monitoring in clear day condition. Multi-spectral images were obtained from a 5-band multi-spectral camera mounted on rotary wing UAV. Reflectance were derived by the direct method using down-welling irradiance measurement. Reflectance using UAV imagery on calibration tarp, concrete and crop experimental sites did not show stable by time and daily reproducible values. But the CV (Coefficient of Variation) of diurnal NDVI on crop experimental sites was less than 5%. As a result of comparing NDVI at the similar time for two day, the daily mean average ratio of error showed a difference of 0.62 to 3.97%. Therefore, it is considered that NDVI using UAV imagery can be used for time series crop monitoring.
Keywords
UAV; Reflectance; NDVI; Diurnal change; Remote sensing;
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Times Cited By KSCI : 10  (Citation Analysis)
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