This means that spectral variability associated with gully features,
such as the presence of vegetation, or shadow- or moisture-related
brightness differences, cannot be effectively captured with a methodpurely based on spectral information. With growing availability of
HRI, a shift away from traditional pixel-based methods has been
necessary. The analysis of objects or features, as opposed to individual
pixels, is more appropriate to address the aforementioned heterogeneity,
and more suitable for knowledge-driven analysis akin to visual
image interpretation.