  Consider the problem of inverse scattering of time-harmonic point sources
from an infinite, penetrable rough interface with bounded obstacles buried in
the lower half-space, where the interface is assumed to be a local perturbation
of a planar surface. A novel version of the sampling method is proposed to
simultaneously reconstruct the local perturbation of the rough interface and
buried obstacles by constructing a modified near-field equation associated with
a special rough surface, yielding a fast imaging algorithm. Numerical examples
are presented to illustrate the effectiveness of the inversion algorithm.
