Method and system for extracting three-dimensional parameters of tidal creek based on photogrammetry of unmanned aerial vehicle

The invention discloses a tidal creek three-dimensional parameter extraction method based on unmanned aerial vehicle photogrammetry. The method comprises the following steps of collecting tidal creek image data through an unmanned aerial vehicle; importing the tidal creek image data into three-dimensional modeling software, constructing a digital elevation model of a tidal creek region, predicting the profile form of the water-containing tidal creek by using Gaussian fitting, and complementing the underwater elevation defect value of the tidal creek; based on the digital elevation model of the tidal creek region, extracting a tidal creek region range in combination with elevation and slope thresholds, and obtaining a tidal creek vector boundary and a central line by using a GIS vectorization tool; and constructing a measurement sample line and a measurement sample point by utilizing GIS software based on the vector boundary and the center line of the tidal creek, and calculating three-dimensional parameters o