Аннотация:The paper describes the method developed to estimate the state of the vegetation (amount of phytomass) and state of soils (amount of humus) using multichannel spectral images. The method uses the function of sensitivity of the combinations of spectral channels of scanning radiometers correspondent to such parameters as ''brightness of soil'' and ''vegetation greenness'' to the spectral composition of direct solar radiation, to the diffuse scattered radiation, to the spectral reflectance of soils and vegetation, and to the parameters of measuring instruments. The paper also discusses the facilities of implementation of the models developed to calculate the retrieval accuracy.