A wavenumber filter can be used in conjunction with the Hartley-Tuller-Shannon formula to bring about some reduction in the number of ambiguous contours on a gravity map. The filter focuses the interpreter's attention on the maximum response to density changes within a given layer. At the same time, characteristics of the filter design, such as bandwidth and power of the desired output relative to other interfering outputs, can be used in the H-T-S formula to determine a minimum contouring threshold, such that the relative number of false anomalies and missed true anomalies is minimized. In addition, it is also possible to estimate a lower limit on the probability that an anomaly observed on a map originates in a target layer.

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