engleski

INTERPOLATION OF WATER DEPTH DATA CAPTURED BY A MULTIBEAM ECHOSOUNDER SYSTEM TO ELEVATION MODELS

With the help of The Department of Geodesy of Bochum University of Applied Science, measurements of underwater topography at the lake in Haltern, using a multibeam echosounder system, were conducted. Collected 3D point cloud is described and its characteristics are listed and explained. Four types of interpolation methods were applied on the data, Inverse Distance Weight (IDW), Triangulated Irregular Network (TIN), Ordinary Kriging (OK) and Cubic Spline interpolation. For application of interpolation on the measured data, QGIS software was used. The question of which interpolation methods are suitable with regard to the special properties of the measurement data was investigated. For each interpolation method, one raster as a result was created. With the help of histograms that belong to each resulting raster, and the statistical data, conclusions were made. Interpolation method that best suits the measured data used in this thesis work is Ordinary Kriging. Resulting raster is the smoothest without no-data cells.

interpolation, multibeam echosounder system, Ordinary Kriging, QGIS software

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