Abstract
We evaluate the spatial variation of venusian surface emissivity at 1.18 um wavelength using multispectral images obtained by the Near-Infrared Mapping Spectrometer (NIMS) on board the Galileo spacecraft. To analyze the NIMS observations, synthetic spectra have been generated by means of a line-by-line radiative transfer program which includes both scattering and absorption. A modulation of emission by the cloud opacities is removed using simultaneously measured 1.74 and 2.3 um radiances.