Three-dimensional navigation channel and section display method based on sparse scatter data

The invention provides a three-dimensional navigation channel and section display method based on sparse scatter data. The method comprises the following steps: 1) establishing a three-dimensional display model of a navigation channel; 2) constructing irregular quadrilateral frames; 3) halving each irregular quadrilateral frame and connecting corresponding equal diversion points of opposite sides to form grids; 4) mapping each triangle top point in the triangular mesh into the grids and recording as data points of the corresponding grids; 5) extracting line and row data of the data points in the corresponding grids; 6) carrying out smoothing processing on the section data points through a mean filtering or Gaussian filter method; and 7) obtaining a curve graph of the section of the irregular navigation channel by drawing a Catmull-Rom curve. The method avoids the step of constructing intermediate data from a scatter diagram, can be suitable for irregular navigation channels and can obtain section data at the