Scope of services
To survey the bed of lakes, rivers or the sea, hydrographic systems such as sidescan sonars or multibeam echosounders can be employed. Sidescan sonar data creates monochromatic images of the acoustic backscatter from surfaces. In principle this alone allows for a qualitative interpretation about other properties. Modern high resolution multibeam echosounders allow further characterizing and accurately measuring of small features. A sidescan sonar can be used (among other things) to map sediments and habitats and to detect natural obstacles which may be present in the form of boulders or stone fields. Furthermore lost objects or manmade obstacles like fishing nets or ammunition can be identified. The methods are thus very suitable to survey large areas of the sea floor to eliminate risks before the start of an offshore construction project or after to certify that no foreign objects are left behind. By using specialized computer software and additional grab-samples (e.g. Van-Veen Grab) the seabed can be classified based on sediment types.