A preliminary description of the spatial database under development for the ESMAC (Environmental Seabed Mapping and Classi cation) project is presented.The system has the working name of GISMO (Geographic Information system + MOSaiccing).The paper outlines requirements and key features of the design.It is required to handle side-scan data from Geological Survey of Sweden.and multibeam data from Simrad Subsea MS of Norway.Howeverthe multibeam data is subject to considerable processing in any case to generate the bathymetric terrain model.which simpli es the GlSMO task.Hence the paper is more concerned with processing of digital sonar data.A main requirement is to support hydroacOus 'c classi cation'experiments by mapping ground truth" showing the distribution of bottom sediments and bentos over selected regions of the sea oor.Within the project, ground-truthing of shell sh habitats and sea-weed is carried out by video-camera using a remotely operated vehicle.A new procedure is described for generating strip-charts of the seabed from video-sequences, to enable them to be handled in a similar manner to side-scan records.Current facilities for sonar preprocessing and mapping are outlined, giving an example of the mosaiccing technique.-'
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