Seabed geomorphologic boundary extraction method based on OTSU algorithm

Abstract

The invention discloses a seabed geomorphologic boundary extraction method based on an OTSU algorithm. The method comprises the following steps: 1) calculating maximum slope and gradient of each measurement point according to water depth distribution in a target area; 2) calculating similar curvature of each measurement point according to gradient distribution in the target area; 3) normalizing the similar curvature value of each measurement point in the target area to a specified range; 4) according to the nonlinear transformation relation, expanding the dynamic range of a local area of the normalized curvature value; 5) estimating threshold of curvature segmentation through the OTSU algorithm; and 6) dividing the measurement points, the curvature values of which are not smaller than thethreshold, into boundary points. The geomorphologic boundary extraction method can effectively identify complex geomorphologic boundary details, suppresses course noise, greatly reduces work intensityof scientific research and engineering personnel and improves work efficiency thereof; and the method is suitable for boundary extraction of geomorphologic units in relevant fields of morphological analysis, marine surveying and mapping, seabed resource survey and oceanographic engineering.

Description

Technical field [0001] The invention relates to the technical fields of marine surveying and mapping, marine engineering, marine oil and gas resources and the like, and in particular relates to a method for extracting seabed landform boundaries based on Dajin algorithm. Background technique [0002] Undersea topography usually refers to the shape of the solid earth's surface covered by sea water. The seabed, like the land, is distributed with complex and diverse landforms. The seabed topography and landform are closely related to the exploration and exploitation of marine resources. The distribution of submarine topography is an important reference for the construction of drilling platforms and the laying of submarine pipelines. The acquisition and research of seabed geomorphic features are becoming more and more important. Obtaining seabed topography maps has become a hot topic for experts and scholars. [0003] Water depth distribution data is one of the main data for geomorp...

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Problems solved by technology

[0004] At present, the division of seabed landforms mainly depends on the manual outline of science and technology and engineering personnel. This method requires the processing personnel to have rich geoscience knowledge and experience in observation and judgment. It can make full use of the knowledge of the staff and has good flexibility. However, this method has great High subjectivity, there are shortcomings such as inaccurate landform division, poor timeliness, poor repeatability, long information acquisition cycle, and high labor intensity

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