Researchers have generally found that when pixel-based
methods are applied to high-resolution images a “salt and
pepper” effect was produced that contributed to the inaccuracy
of the classification (Campagnolo and Cerdeira, 2007; De Jong
et al., 2001; Gao and Mas, 2008; Van de Voorde et al., 2004).
For decades, GIS specialists have theorized about the
possibility of developing a fully automated classification
procedure that would be an improvement over pixel-based