During the past 20 years the development of remote sensing techniques has been very intense and remotely-sensed data have become a most powerful tool for investigations on the subject of geology, geophysics, mineral resources and energy. For geology and investigations on mineral resources manifold operational applications can be realized. Multisensor and muhitem-poral data are available, with varying spectral and spatial resolutions, to facilitate an optimized detection of the parameters of interest. Analogous, and of greater interest for the main topics of geoscience, digital data have proved to be an indispensable working base in many applications. During this period of technical development of different sensors the availability of the new remote sensing data opened up the possibilities of analysis beyond purely qualitative to more quantitative achievements. In this framework numerous geoscientific researchers in Europe were engaged in developing methodologies for the application of the new remote sensing data. The development of image processing techniques, e.g. to merge multisensor data or classification algorithms, was advanced. The feasibilities of remote sensing have shown distinct characteristics for numerous applications, in particular during recent decades, from the combination of different data sets.
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