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Earth resources satellite data for geological research is discussed. Imagery, as well as spectral data are widely used in lithological and structural mapping, groundwater, mineral and hydrocarbon prospecting, and in environmental geological investigations. Spectroradiometry supports field and remote sensing work. The discussion focuses on the indipensable need of the human interpretation of satellite derived data. From the side of the interpreter it requires a sound education in his geological or geoscientific profession. From the side of the image processing, it requires an optimized image for the task at hand. Sensor development and higher spatial resolution of future satellites cannot replace the human interpretation of the acquired data. Better data, however, will improve the results of the human interpreter.