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The aim of this paper is to present how the SPOT spectral bands have been adapted to the spectral properties of the observed ground objects. The text starts with generalities: brief description of the SPOT system and of the simulations we are making so as to prepare future users of SPOT data, precise description of measured radiances and reflectances, review of atmoshpheric effects. Shown are the profiles of the 3 spectral bands have been optimized with respect to thematic objectives: minimization of atmospheric perturbations, spectral properties of some objects such as vegetation. Shown are the choice between two types of panchromatic bands (0.50 - 0.70 micrometers) and between objects thematically characterized, taking into account the most interesting features to be observed by a scanner with the SPOT resolution., This article is from 'Papers Selected for Presentation at the International Symposium on Remote Sensing of Environment (16th) Held at Buenos Aires, Argentina on 2-9 June 1982. Volume 2,' AD-A134 720. p1007-1015.