Seamless geocoding mapping method and system for side-scan sonar

The invention provides a seamless geocoding mapping method and system for a side-scan sonar, and the method comprises the steps: reading the original data of a side-scan sonar image, and forming a waterfall image through horizontal stacking; extracting channel data; performing quality control and interpolation on the channel data, and calculating the position of the tow fish based on the consistency of the tow fish and the course of the ship body; calculating the echo position of the side-scan sonar image according to the tow fish position and the ship course; determining a mapsheet range according to the echo position, setting a mapping resolution, and determining a pixel space of the coded image; traversing and extracting two pairs of adjacent echoes on adjacent scanning lines in the waterfall image, determining four-corner pixel positions of the two pairs of echoes in a pixel space, and constructing a local grid cache region covering the four-corner pixel positions; and scanning the local grid cache region