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Though the wave equation is a unitary operator,
many operators based on it are not unitary
because many approximations are made to be implemented numerically
in finite and discrete space.
The nonunitary property of the operators
produce many artifacts in the solution space
when the property is applied
to data that were produced by a continuous unitary operator,
such as real seismic data.
This paper presents a method of reducing these artifacts
in migration, datuming, and interpolation
by using the technique of least-squares optimization.

** Next:** ACKNOWLEDGMENTS
** Up:** Ji: LS imaging, datuming
** Previous:** LEAST-SQUARES INTERPOLATION
Stanford Exploration Project

11/17/1997