40 ppd global maps (~1.5 km/pixel at the equator) of emissivity of the Martian surface between 5 to 5.1 μm, using more than four Martan years of OMEGA data. We produce four global maps, filled at more than 98 %. Surface emissivity at 5.03μm is available here, other maps available at 5.05, 5.07 and 5.09 μm. Data gaps are set to 0 or NaN.