Recently, the application of the method of images to obtain apparent resistivity of a perfectly conducting sphere buried in a half-space has been criticized on the grounds that the number of images needed is too large. Instead, use of the method of graphs, in conjunction with the method of images, has been suggested. Although the number of images needed is large, they are easy to compute and many of them occupy the same position, thereby the amount of necessary computation is drastically reduced. A computer program based on the method of images is used to give normalized total-field apparent resistivity contours for bipole-dipole arrays. Such theoretical contours can be used to locate the epicenter of a conductive buried sphere by comparing them with field data.

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