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The paper compares two different techniques for mapping the intertidal zone of the Wash estuary on the East coast of the United Kingdom using Landsat 5 thematic mapper (TM) satellite imagery. Two scenes from different dates were processed using a conventional maximum likelihood classifier and a fully constrained linear mixture model. The Landsat TM data was atmospherically and radiometrically corrected to allow meaningful comparison to be made between the scenes. The data were geometrically rectified and incorporated into a coastal monitoring Geographical Information System (GIS) along with information acquired from previous ground based surveys. -from Authors