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** Up:** Ji: Datuming
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In this paper, the basic strategy for finding a datuming operator is
that of first formulating a forward modeling operator
and then deriving the corresponding datuming operator
by transposing and taking the complex conjugate
of the forward modeling operator.
For poststack or zero offset sections,
the forward modeling is an algorithm
that extrapolates the wavefield upward from a flat surface
to an irregular surface by the one-way wave equation
using half the velocity of the medium.
The modeling algorithm is derived
so that it can be used with any depth extrapolation technique,
including the phase-shift, split-step Fourier,
and finite-difference methods.

** Next:** Forward modeling operator
** Up:** Ji: Datuming
** Previous:** Introduction
Stanford Exploration Project

11/17/1997