Investigation Into Reflectance Characteristics of Trees Infected by Pine Wilt Disease

Abstract

Pine wilt disease has known as a serious forest disease in East Asia such as Japan, Korea and China. Fumigation and burning are considered as best way to treat infected tree at early detection. For investigate spectral reflectance characteristics of infected trees, periodic measurement has been done in both infected and non-infected trees. Infected and non-infected trees' reflectance (400 nm~2,500 nm wavelength) are detected from June to October with GER3700 spectrometer. Noise of reflectance data was corrected using cubic spline interpolation method. Reflectance was changed in most of infected trees with ranges Red (600 nm~700 nm) and Middle Infrared (1,400 nm~1,500 nm) within two months after injected by Pine Wood nematode (PWN), but there was no differences in non-infected trees. Infected and non-infected trees were compared statistically in each period. As a result, we found that a statistically significant difference was occurred at Red and Middle Infrared (MIR) 2 months after injection (p<0.05), however, no significant difference in near infrared (p>0.05). Therefore, the early detection of infested pine trees by PWN may possible through detecting the change of spectral reflectance at red and MIR.

Construction of ortho image for efficient forest management using UAS

“…But, as the access to the affected area is difficult for disease control as well as surveying of the affected area, the site survey requires a lot of labor [7]. Accordingly, the rapid understanding of the infected trees with the regular monitoring of the affected area through the scientific and objective method is a must to make the objective evaluation on the possible future breakup and effect.…”

Acquisition of Geospatial Information for Forest Management Using Unmanned Aerial Vehicle

“…But, as the access to the affected area is difficult for disease control as well as surveying of the affected area, the site survey requires a lot of labor [7][8] [9]. Accordingly, the rapid understanding of the infected trees with the regular monitoring of the affected area through the scientific and objective method is a must to make the objective evaluation on the possible future breakup and effect.…”