The use of multispectral scanning data, received from the Landsat-2 satellite, for certain estuarine and coastal studies is described and this is followed by a brief description of the DIBIAS interactive digital image-processing system, which was developed at the German Aerospace Establishment at OberpfafFenhofen. Several examples of Landsat-2 images of the Tay Estuary and its environs are presented as false-colour composites and monochrome pictures. A qualitative interpretation is presented and several quantitative interpretations have also been made.