Multisensor image data (SIR‐A, Seasat SAR and Landsat MSS) over areas in northern Algeria and eastern Utah have been coregistered in order to assess the complementary effects of the orbital sensors for geologic mapping in two very different terrains. This first attempt at registering such a data set shows that the radar backscatter information provided by the SIR‐A image increases the classification accuracy of several geologic units over the Landsat image alone, and over combined Landsat and Seasat images.
La calidad geométrica, la vision sinoptica sobre
grandes extensiones, el carâcter a menudo expresivo de las imâgenes obtenidas a partir del espacio, han provocado la utilizacion de fondos de imagenes espaciales con superpo-siciones corograficas. Se puede pro-poner una tipologfa de estos documentes sobre fondos de imâgenes satelitarias : he aqm un espécimen a escala 1/25 000 a partir de los dates SPOT.
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