“…Furthermore, some papers used features extracted from the images as input to their models, such as shape and statistical features (Hall, McCool, Dayoub, Sunderhauf, & Upcroft, 2015), histograms (Hall, McCool, Dayoub, Sunderhauf, & Upcroft, 2015), (Xinshao & Cheng, 2015), (Rebetez, J., et al, 2016), Principal Component Analysis (PCA) filters (Xinshao & Cheng, 2015), Wavelet transformations (Kuwata & Shibasaki, 2015) and Gray Level Co-occurrence Matrix (GLCM) features (Santoni, Sensuse, Arymurthy, & Fanany, 2015). Satellite or aerial images involved a combination of pre-processing steps such as orthorectification (Lu, et al, 2017), (Minh, et al, 2017) calibration and terrain correction (Kussul, Lavreniuk, Skakun, & Shelestov, 2017), (Minh, et al, 2017) and atmospheric correction (Rußwurm & Körner, 2017).…”