  We present maps of surface composition of Europa's anti-jovian hemisphere
acquired using high spatial resolution IFU multi-spectral data from the SPHERE
instrument on the Very Large Telescope (0.95 to 1.65$\mu$m) and the NIMS
instrument on the Galileo orbiter (0.7 to 5.2$\mu$m). Spectral modelling was
performed using a Markov Chain Monte Carlo method to estimate endmember
abundances and to quantify their associated uncertainties. Modelling results
support the leading-trailing hemisphere difference in hydrated sulphuric acid
abundances caused by exogenic plasma bombardment. Water ice grains are found to
be in the 100$\mu$m to 1mm range, with larger grains present on the trailing
hemisphere, consistent with radiation driven sputtering destroying smaller
grains. Modelling best estimates suggest a mixture of sulphate and chlorinated
salts, although uncertainties derived from the MCMC modelling suggest that it
is difficult to confidently detect individual salt abundances with low spectral
resolution spectra from SPHERE and NIMS. The high spatial resolution offered by
SPHERE allows the small scale spatial distribution (<150km) of potential
species to be mapped, including ground-based detection of lineae and impact
features. This could be used in combination with other higher spectral
resolution observations to confirm the presence of these species.
