Abrtmct -The coastline mapping k a crucial point for corrotal studies and cartography. In the most general case^, coastlines evolutiona r e v d . to be slow enough to allow regular upgrading of the m a p by the meane of airborne or in ritu data. But in some regions the annual coastline moving can reach lkm. In such ca8es, there is a need for a cheaper and accurate data, that can ensure a great spatial covering at short intervals. The spaceborne remote sensing data respond partly to them criteria. We present in this work a new method using SAR images for coastline detection. Discrimination between sea and land is achieved by the uee of the speckle textural information. The results are compared with other ones found with more claeeical methode. The coastline retrieved with our method reveale to contain more details and to be more reliable.Re'sumk -La cartographie de la ligne des rivagea est un point crucial pour lee dtudea cbtihres. Dane le cas gdndral, le mouvement de la ligne dea rivages est suffisamment lent pour que sa cartographie puisse 6tre mise A jour A l'aide de relevds in situ ou adroportb.Mais, en certaines rdgione le ddplacement annuel de la ligne dee rivages peut atteindre lkm. Dana ce cas, on recherche une d o n n k a w i prkise et moins ondreuse A collecter, permettant d'maurer une grande couverture spatiale et des intervallee de t e m p courts entre deux acquisitions.Lee d a n n h de tdlMdtection spatiale rdpondent en partie A cee critbres. Nous prhntons dans ce travail une nouvelle mdthode utilisant lee images SAR pour la dktection du trait de c6te. La distinction entre la terre et la mer est r6alish h l'aide de l'information texturale du speckle. Lee rdsultate sont comparhs A ceux fournis par des mdthodes plus classiquea. Le trait de cBte ddtermind h l'aide de notre mdthode apparait avec plus de ddtails et de vraisemblance.
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