  Between 2004 and 2017, spectral observations have been gathered by the Visual
and Infrared Mapping Spectrometer (VIMS) on-board Cassini (Brown et al., 2004)
during 23 Enceladus close encounters, in addition to more distant surveys. The
objective of the present study is to produce a global hyperspectral mosaic of
the complete VIMS data set of Enceladus in order to highlight spectral
variations among the different geological units. This requires the selection of
the best observations in terms of spatial resolution and illumination
conditions. We have carried out a detailed investigation of the photometric
behavior at several key wavelengths (1.35, 1.5, 1.65, 1.8, 2.0, 2.25, 2.55 and
3.6 ${\mu}$m), characteristics of the infrared spectra of water ice. We propose
a new photometric function, based on the model of Shkuratov et al. (2011). When
combined, corrected mosaics at different wavelengths reveal heterogeneous
areas, in particular in the terrains surrounding the Tiger Stripes on the South
Pole and in the northern hemisphere around 30{\deg}N, 90{\deg}W. Those areas
appear mainly correlated to tectonized units, indicating an endogenous origin,
potentially driven by seafloor hotspots.
