Integration of Acoustic Classification into Hydrographic Survey Programmes

Acoustic seabed classification technologies measure acoustic diversity in the seafloor and surficial substrate. This diversity is generally well correlated with both geology and those benthic species which are keyed to geologic and biotic components of the seafloor. Remote acoustic seabed classification has reached a level of maturity and acceptance in the ocean community such that it should be included in routine bathymetric surveys, noting that the incremental cost of integrating seabed classification into modern hydrographic surveys is minimal. Survey scales for both single beam and multibeam operations are well matched to those scales optimal for seafloor classification needs. Software tools for processing the classification information are continually improving and the current state of the art permits revisiting archived raw data to mine it for future, as yet unknown, needs. In addition to supplementing hydrographic charts, markets for seabed classification products include geomorphological maps, habitat maps for benthic and demersal communities, stock assessment maps, environmental mapping of contaminants, military route survey investigations, and producing visual aids for public information campaigns. Ultimately, this classification information will be served to the public via web portals. The factors to consider when integrating seabed classification into hydrographic programmes are detailed and examples of improved results are presented. CHS is implementing a programme to acquire acoustic classification information as a normal part of its bathymetric surveys for both single beam and multibeam operations and to offer this data to our clients as a product.