Conclusions

The focus of this study was to explore three techniques for identifying wetland invasive plant species using field-level hyperspectral data. The results are possibly applicable to airborne hyspectral systems as well, for the spectra had bandsets similar to those available from commercial airborne vendors. Continuum removal largely decreased separation according to the JM distance measure. Based on the continuum removal results, the role of canopy structure and background signal often provides great utility for separating certain wetland species. The 2nd derivative and shape filtering methods were complementary when characterizing spectra. The 2nd derivative approach found that absorption and reflectance wavelength locations were relatively consistent between species and life forms and emphasized the NIR region. Shape filtering showed that when trying to distinguish invasive species, useful wavelength regions can be species specific and method specific. This can be critical when choosing classification techniques and wavelengths as the usefulness of wavelength regions vary by species and methodology.

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