The high resistivity environment of Korean geology provides a suitable condition for geoelectric imaging methods, particularly dc resistivity and radar technologies. The noticeable feature of our country is that $70\%$ of inland is in the mountainous area and the geology is too complicated. This natural environment and the rapid social development have demanded more precise underground imaging technologies, which has eventually resulted in developing more refined imaging ones, such as (1) from two to three dimensions, (2) from surface exploration to crosshole imaging, and (3) from isotropic to anisotropic medium. Also, it has resulted in widening the applying environments, such as (4) from land to water-land complex area. This paper introduces several case histories of Korea using high-resolution geoelectric imaging technologies. The first two case histories using dc resistivity method were conducted for the construction of social infrastructures where three dimensional (3-D) surveys were inevitable because of the rugged topography and the 3-D nature of targets. Also introduced is a case history applying a great number of crosshole resistivity tomography surveys to investigate the cause of the ground subsidence that occurred in the downtown of a small city in Korea, where a systematic application of surface exploration was nearly impossible. Through the two case histories of crosshole tomography surveys of radar and dc resistivity, we intend to show that anisotropic characteristics gave us important information for understanding the internal status of basement rock, when the subsurface material is anisotropic. The last example is the case history of underwater resistivity imaging for the construction of a railway bridge, in which we could image faults and fractures clearly by adopting modified electrode arrays and installing electrodes at the river bottom, and the pier locations were rearranged by the results of this survey to avoid the weak zones.