Abstract The boundaries detection techniques have a great role in enhancing and interpreting the geologic features of magnetic data. In the literature, several filters (THG, AS, TA, NTilt, Theta, TDX, TAHG, LTHG) for identifying the boundaries of the magnetic sources have been suggested. These methods are generally performed based on gradients (vertical and horizontal) of the potential field. This paper presents a comparative investigation of different boundary detection filters including THG (total horizontal gradient), AS (analytical signal), TA (tilt angle), Theta (Cos θ), TDX (horizontal tilt angle), and LTHG (Logistic function of the THG). The effect of each filter was examined on two synthetic magnetic data sets. Moreover, the filters are also applied to a real magnetic data set from the Gabal (G) Um Monqul, North Eastern Desert (NED) of Egypt. The obtained results were correlated with known geologic structures of the study area. From the comparison between several applied methods, the horizontal boundaries of geologic sources obtained by the LTHG were found to be sharper and clearer than other ones. The results confirm that the LTHG method is an effective filter for interpreting aeromagnetic data qualitatively and can be applied for enhancing the source edges of different potential field datasets.

中文翻译：

---

THG、AS、TA、Theta、TDX 和 LTHG 技术使用合成模型改进磁数据源边界检测的比较研究：埃及东北沙漠 G. Um Monqul 的案例研究

摘要 边界检测技术在增强和解释磁数据地质特征方面具有重要作用。在文献中，已经提出了几种用于识别磁源边界的滤波器（THG、AS、TA、NTilt、Theta、TDX、TAHG、LTHG）。这些方法通常基于势场的梯度（垂直和水平）执行。本文介绍了不同边界检测滤波器的比较研究，包括 THG（总水平梯度）、AS（分析信号）、TA（倾斜角）、Theta（Cos θ）、TDX（水平倾斜角）和 LTHG（逻辑函数） THG）。在两个合成磁数据集上检查了每个过滤器的效果。此外，滤波器还应用于来自 Gabal (G) Um Monqul 的真实磁数据集，埃及的东北沙漠（NED）。获得的结果与研究区的已知地质结构相关联。通过对比几种应用方法，发现 LTHG 获得的地质源水平边界比其他方法更清晰、更清晰。结果证实，LTHG 方法是定性解释航磁数据的有效过滤器，可用于增强不同势场数据集的源边缘。