Natural shoreline automatic acquisition method and device based on laser point cloud data and average large tide surface, medium and product

Abstract

The invention provides a natural shoreline automatic acquisition method based on laser point cloud data and an average large tide surface. The natural shoreline automatic acquisition method comprises the following steps: acquiring laser point cloud data from land to an intertidal zone when an ocean ebbs; acquiring water level data, and calculating a plurality of years of annual and overall average large-tide high-tide surfaces and respective corresponding elevation values of the annual and overall average large-tide high-tide surfaces; if the difference result between the laser point cloud data and the annual average high-tide elevation value is within the laser point cloud error range, taking the laser point cloud data as natural shoreline association point data; and processing the natural shoreline association point data to obtain natural shoreline data, predicting the future trend, and analyzing the correlation between the periodic change of the natural shoreline data elevation and the coast erosion. The method is less intervened by investigators, is high in automation degree, and improves the working efficiency and the natural shoreline determination precision; as the water level data is real-time water level observation data or water level data forecast through tide, the water level data is high in current potential, the calculated average high tide surface is high in precision, and the natural shoreline extraction precision is high.

Description

technical field [0001] The present invention relates to the technical field of coastline survey, in particular to a method, device, medium and product for automatically acquiring natural coastlines based on laser point cloud data and average high tide and high tide surfaces. Background technique [0002] The coastline is the trace line of the average spring tide and high tide, and also the dividing line between the sea area and the land area management area. After being approved by the people's governments of coastal provinces, autonomous regions, and municipalities directly under the Central Government, it becomes the basic basis for sea area management and plays a very important role in strengthening the protection of natural resources. Due to the ups and downs of seawater, it has a serious impact on coastal land erosion. Obtaining coastline data through tidal reconciliation analysis combined with laser point cloud data can provide data support and cause analysis for coastl...

AI Technical Summary

Problems solved by technology

[0004] (1) In the definition of the coastline using the analytical method, there is a large workload and the measurement work is easily affected by environmental factors. At the same time, the coastline measurement is carried out at the seaside, and there is a certain danger to the life safety of the investigators.

[0005] (2) In using the graphic method to define the coastline, the accuracy of the coastline definition depends on the accuracy of the remote sensing image on the one hand, and on the other hand, due to the timeliness of remote sensing image acquisition, if the timeliness of the remote sensing image used is not enough to support the coastline definition Job requirements, which can lead to errors and errors in coastline definition, and such errors and errors are difficult to detect

[0006] (3) Regardless of whether the coastline is defined by the analytical method or the graphical method, there are certain requirements for the professional knowledge of the surveyors. The accuracy of the coastline definition work is greatly affected by the subjective factors of the surveyors, and it is difficult to form a unified standard for coastline measurement and definition. The constructed coastline features are affected by both definition error and measurement error

Images