2.2.4. Topographic Data

Some research indicated that using topographic variable data, such as the digital elevation model (DEM) produces major classification enhancements [32,53]. Therefore, shuttle radar topography mission (SRTM) one-arcsecond DEM tiles were resampled to a 10-m spatial resolution by the bilinear interpolation. Additionally, during the test phase of the research, slope and aspect were derived from the SRTM DEM, but their presence as input features brought noise in the dataset, which led to lower classification accuracy. Therefore, the aforementioned features (i.e., slope and aspect) were not further considered as input features for vegetation mapping.
