Upward continuation is a method used in oil exploration and geophysics to estimate the values of a gravitational or magnetic field by using measurements at a lower elevation and extrapolating upward, assuming continuity. This technique is commonly used to merge different measurements to a common level so as to reduce scatter and allow for easier analysis.
See also Petroleum geology
References Upward Continuation in Schlumberger's Oilfield Glossary Downward Continuation in Schlumberger's Oilfield Glossary