  We investigate the capabilities of space-based gravitational-wave detector
networks, specifically Taiji and LISA, to measure the anisotropies in
stochastic gravitational-wave backgrounds (SGWBs), which are characterized by
the angular power spectrum. We find that a detector network can improve the
measurement precision of anisotropies by at most fourteen orders of magnitude,
depending on the angular multipoles. By doing so, we can enhance our
understanding of the physical origins of SGWB, both in astrophysical and
cosmological contexts. We assess the prospects of the detector networks for
measuring the parameters of angular power spectrum. We further find an
inevitable effect of cosmic variance, which strengthens the importance of
configuring detector networks. Our findings also suggest a potential detection
of the kinematic dipole due to Doppler boosting of SGWB.
