A method of conducting a potential field survey of a surface comprises following a set of paths along an observation surface at an observation height above the surface and measuring potential field data at points on said paths. This set of paths comprises at least one reference path and a plurality of survey paths associated with the reference path, where the distance between each of the survey paths and the reference path is a function of the observation height. The set of paths may define a generally fan-shaped pattern diverging from a common region. Sub-patterns within the set of paths may be defined by the use of multiple reference paths. The survey is not constrained to the standard grid pattern, and so results in an improved set of data.
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