  Based on a spin-dependent Boltzmann-Uehling-Uhlenbeck transport model with
spin-dependent potentials incorporated using the lattice Hamiltonian method, we
have studied the global spin polarization perpendicular to the reaction plane
as well as the local spin polarization in the longitudinal direction in
non-central intermediate-energy heavy-ion collisions, as an extension of
similar studies in relativistic heavy-ion collisions. Both the global and the
local spin polarizations are found to be mostly dominated by the time-odd
component of the nuclear spin-orbit potential. Impacts of various theoretical
uncertainties on the nucleon spin polarization as well as its dependence on the
beam energy and impact parameter are discussed. Our study serves as a baseline
for understanding the spin polarization mechanism of strongly interacting
matter produced in heavy-ion collisions dominated by nucleon degree of freedom.
