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Geospatial assessment of pest-induced forest damage through the use of UAV-bases NIR imaging and Gi-technology
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Resumo(s)
Every year oak forests become infected by populations of the splendor beetle
(Agrilus bigutattus). The detection and monitoring of infected trees is important,
because of economic and ecological reasons. Traditional approach to detect the pest
infestation level of each tree is performed by using ground-based observation
method. It is long and ineffective method because of limitations, such as: poor
visibility of the highest trees and impenetrability of some forest plots.
The main goal is to identify infected oaks trees by splendor beetle at the 2
study areas. Pest-infested oak trees by splendor beetle are characterized by high level
of defoliation and different reflection signatures. These features can be detected by
using very high resolution color infrared (CIR) images.
In August 2013 it was performed flight campaign by using unmanned aerial
systems (UAS). CIR images were covering 2 test sites in rural area, near city Soest
(Germany). Study areas represents small, privately owned oaks forest plots. In this
research was used a small quadrocopter (Microdrone MD4-200) with vertical takeoff
and landing capability (VTOL). Microdrone is carried a digital camera
(Canon PowerShot SD 780 IS). Additionally, camera was modified to capture not
just a visible spectrum, but also NIR spectrum (400 to 1100 nm) of infected oaks.
The proposed workflow includes the CIR image acquisition, image stitching,
radiometric correction, georeferencing, modified vegetation indices calculation, pixel
based and object-based image classification and accuracy assessment. Images were
classified using 5 classes (healthy, low infected, high infected, died trees and canopy
gaps).
Finally, the results can be integrated with existing WMS service. Applying of
UAV make possible to obtain multitemporal data, which facilitates monitoring and
detection of infected trees. The work was performed in close cooperation with the
Forestry Department of Soest (Germany).
Descrição
Dissertation submitted in partial fulfillment of the requirements for the Degree of Master of Science in Geospatial Technologies.
Palavras-chave
Color-infrared Images (CIR) Near-infrared Images (NIR) Object-based Classification Pest Infestation Pixel-based Classification Principal Component Unmanned Aerial Vehicle Vegetation Indices Very High Resolution Images