Dictionary:Upward continuation

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{{#category_index:U|upward continuation}} Calculation of the potential field at an elevation higher than that at which the field is known. The continuation involves the application of Green’s theorem and is unique if the field is completely known over the lower surface (which could be true for gravity and magnetic fields) and where all sources above the lower surface are known (usually all are zero). Upward continuation is used to smooth out near-surface effects and to tie aeromagnetic surveys flown at different heights.