  We study the advantage of combining measurements from future ground and space
based gravitational wave detectors in estimating the parameters of a black-hole
binary coalescence. This is an extension of our previous work (PTEP 053E01
(2016)) where we used pattern averaged waveform to study non-spinning binaries.
In this work we study the localisation and binary plane orientation, including
the (non-precessing) spin of binaries. We focus on the third generation
terrestrial detector `Einstein telescope' and a proposed space based detector
`Deci-Hertz Interferometer Gravitational wave Observatory' (DECIGO). We
consider two possible orbits for DECIGO, a heliocentric orbit and a
Sun-synchronous geocentric orbit. We demonstrate that one can obtain order of
magnitude improvement in the localisation from the space-ground combined
measurements, even with a precursor-DECIGO mission (B-DECIGO). This is
especially important for the future of gravitational wave astronomy as
improving the localisation accuracy further improves our chances of identifying
the host galaxies of these binary systems.
