This thesis deals with, how to get a model of heights with decent accuracy, from amateur hydrographic survey. Specifically measurements with Lawrance Elite-5 HDI sonar that is meant for fishing and other fishing activities, with which the bottom of the Lake Bled was measured. The course and method of measurements, use of instruments, processing of data and different graphical displays of results are described. More in depth the thesis is dealing with interpolation of processed data. How, with a different functions, one can execute and improve interpolations of measurements and get rid of the gross errors with matrix filter. Also important is graphical configuration with other informational systems like DOF 2011 (digital orthophoto). For that we need correct transformation of measurements in the right coordinate system. As a result we get a model of depth of Lake Bled in different graphical displays. We also do a comparison with a professionally made model, so we can evaluate accuracy of our results.
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