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Selected Publication:

Einzmann, K; Ng, WT; Immitzer, M; Bachmann, M; Pinnel, N; Atzberger, C.
(2014): Method Analysis for Collecting and Processing in-situ Hyperspectral Needle Reflectance Data for Monitoring Norway Spruce
PHOTOGRAMM FERNERKUN. 2014; (5): 423-434. FullText FullText_BOKU

Abstract:
Forest damage induced by bark beetle attacks can cause major economic losses in forestry. Hyperspectral remote sensing data and state of the art very high spatial resolution satellite data offer a great potential for assessing tree vitality. However, a better understanding of the effects of vitality decrease and its impact on the spectral behaviour of needles is needed. Filling this knowledge gap can make a significant contribution to improve the interpretation of remote sensing data. However, it is still unclear which method for needle spectra collection is most suitable. In this work, two methods for spectral reflectance measurements of Norway spruce needles using portable spectroradiometers were tested and analysed: using a classical fore optic and a so-called contact probe. The spectral reflectance data were evaluated with different statistical similarity measure techniques. Besides analysing the measurements themselves, the methods were compared in terms of their practicality. Furthermore, the impact of storage on the reflection behaviour was investigated. The spectral measurements were performed in the field as well as in a laboratory and repeated three times during the 2013 growing season. Based on the obtained results we recommend measuring needle samples with the contact probe of portable spectroradiometers.
Authors BOKU Wien:
Atzberger Clement
Einzmann Kathrin
Immitzer Markus
Ng Wai Tim
BOKU Gendermonitor:


Find related publications in this database (Keywords)
in-situ measurements
needle spectra
Norway spruce
portable spectroradiometer
tree vitality


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