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http://dx.doi.org/10.5333/KGFS.2016.36.4.365

Estimating the Spatial Distribution of Rumex acetosella L. on Hill Pasture using UAV Monitoring System and Digital Camera  

Lee, Hyo-Jin (GEOMEXSOFT, Ltd.)
Lee, Hyowon (Department of Agriculture, Korea National Open University)
Go, Han Jong (Department of Agriculture, Korea National Open University)
Publication Information
Journal of The Korean Society of Grassland and Forage Science / v.36, no.4, 2016 , pp. 365-369 More about this Journal
Abstract
Red sorrel (Rumex acetosella L.), as one of exotic weeds in Korea, was dominated in grassland and reduced the quality of forage. Improving current pasture productivity by precision management requires practical tools to collect site-specific pasture weed data. Recent development in unmanned aerial vehicle (UAV) technology has offered cost effective and real time applications for site-specific data collection. To map red sorrel on a hill pasture, we tested the potential use of an UAV system with digital cameras (visible and near-infrared (NIR) camera). Field measurements were conducted on grazing hill pasture at Hanwoo Improvement Office, Seosan City, Chungcheongnam-do Province, Korea on May 17, 2014. Plant samples were obtained at 20 sites. An UAV system was used to obtain aerial photos from a height of approximately 50 m (approximately 30 cm spatial resolution). Normalized digital number values of Red, Green, Blue, and NIR channels were extracted from aerial photos. Multiple linear regression analysis results showed that the correlation coefficient between Rumex content and 4 bands of UAV image was 0.96 with root mean square error of 9.3. Therefore, UAV monitoring system can be a quick and cost effective tool to obtain spatial distribution of red sorrel data for precision management of hilly grazing pasture.
Keywords
Hill pasture; Mapping; Rumex acetocella; Spatial distribution; Unmanned aerial vehicle;
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