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Aerial high resolution imaging of the mistletoe for the assessment of forest decline in fir stands

Silver fir (Abies alba Mill.) is the most widely distributed and the most important commercial conifer species in Croatia. The growing stock of silver fir accounts for about 65% of the total conifer growing stock in Croatia. However, silver fir is also the most endangered tree species in these regions. The results of field research show a significant presence of mistletoe (Viscum album L. ssp. abietis (Wiesb.) Abrom.) on silver firs in Croatia. The current work deals with the issue of mistletoe detection. The purpose of preliminary research was to develop an efficient method of mistletoe detection. Ground-based tests, performed in May 2004 on mistletoe and silver fir, were aimed at formulating a method that will be implemented in the aerial acquisition system. A high-resolution digital camera MS-3100 (four 8 bit channels in VNIR wavelengths, 1392x1039 pixels) and a hyper spectral line scanner V9 (up to 90 channels in VNIR wavelengths) were used with the acquisition systems. The expectation that mistletoe can successfully be detected with a high-resolution digital VNIR camera MS3100 was confirmed by preliminary results.

aerial multispectral high-resolution imaging; forest decline; silver fir; mistletoe; hyperspectral line scanner

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