Comparison of construction methods for DEM of waterway underwater topography

The construction method of digital elevation model for waterway underwater

A DEM is established for the underwater topography of the waterway, and the technical route is to construct a tin, manually remove the redundant triangular edges, and then generate a grid dem using several interpolation methods provided in the CAD Objectarx two-time development interface.

The experiment compares the accuracy of several interpolation methods, and concludes that the error is the least in the linear interpolation based on tin, and it is suitable for the construction of digital elevation model in waterway.

The experimental process : The checkpoint is randomly distributed in the channel, the inspection point underwater elevation data is obtained by the high measurement method, the interpolation elevation of the checkpoint is generated by the DEM interpolation, and the error is calculated from the difference between the measured elevation and interpolation height of the checkpoint, and the medium error is used as the DEM Accuracy Evaluation Index.

Comparison of construction methods for DEM of waterway underwater topography