“…Numerous derivative-based data-processing techniques are frequently used as edge detecting tools such as total horizontal derivatives Grauch 1982, 1985), boundary analysis (Blakely and Simpson 1986), analytic signal amplitude (Roest et al 1992), tilt angle (Miller and Singh 1994), enhanced horizontal derivative method (Fedi and Florio 2001), total horizontal derivative of the tilt angle (Verduzco et al 2004), theta map (Wijns et al 2005), local phase (Cooper and Cowan 2006), normalized standard deviations (Cooper and Cowan 2008), tilt angle derivatives (Salem et al 2008), terracing potential field data (Cooper and Cowan 2009), profile curvature (Cooper and Cowan 2011;Ekinci et al 2013, Ekinci and Yiğitbaş 2015, optimized detection filters , eigenvalue analysis of gravity gradient tensor (Zuo and Hu 2015), improved curvature gravity gradient tensor with principal component analysis (Wang et al 2015), horizontal directional theta method (Yuan et al 2016). In all these image enhancement techniques mentioned above, first-order horizontal derivatives in both x-(east) and y-directions (north) are used.…”