An Integrated Analysis of Landsat OLI Image and Satellite Gravity Data for Geological Mapping in North Kordofan State, Sudan
North Kordofan Region is characterized by poor rock exposure, which makes the traditional field mapping always a problematic issue. The objective of the present study to test the viability of integrating Landsat 8 OLI image and satellite gravity data with limited field work for regional geological mapping in poorly exposed areas. Remote sensing has proven a valuable aid in geological mapping and exploring for mineral deposits. However, this technique has limitations, especially in vegetated areas or regions characterized by poor rock exposure. The processing of Landsat 8 OLI image utilizing various remote sensing techniques such as colour composite, PCA, band ratoing and PC spectral sharpening improved the visual interpretation of the image set. The enhanced image provided persuasive spectral information helpful for discriminating the various rock units. Bouguer anomaly map produced from the processed satellite gravity data provided complementary information that assisted in the delineation of the boundary of different rock domains in addition to the enhancement of the linear features which in most cases represent structural elements such as faults and shear zones. The integration of the different datasets including the enhanced satellite images and gravity data with the petrographic investigation of some selected rock samples in the GIS environment facilitated the production of the final geological map of the study area, which is of accepted credibility and relatively took shorter time frame. Therefore, this integrated approach should be adopted in mapping similar regions of the same characteristics.
Landsat 8 OLI Images, Satellite Gravity, Geological Mapping, North Kordofan, Sudan
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