Method for simplifying shoreline of drowned valley by taking geographical features into account

Abstract

The invention relates to a method for simplifying a shoreline of a drowned valley, in particular to a method for simplifying the shoreline of the drowned valley by taking geographical features into account. The method comprises the following steps: (1) establishing a hierarchical relationship of river mouths of the shoreline of the drowned valley based on a Delaunay triangular network, and calculating the length and width of the river mouth; and (2) designing an important index of the river mouth based on this basis, deducing the number of selected river mouths without changing the shoreline fractal dimension, and selecting the river mouths by adopting a quota method so as to realize shoreline simplification through the river mouth selection. According to the method for simplifying the shoreline of the drowned valley by taking geographical features into account, the important geographical characteristics, such as a tree-shaped structure, a river mouth hierarchical structure and gradual changes of the individual width of the river mouth of the shoreline of the drowned valley and the like can be maintained, and the topological consistency of the simplifying result and the sailing safety are guaranteed.

Description

technical field [0001] The invention relates to a method for simplifying the coastline of a drowning valley, in particular to a method for simplifying a coastline of a drowning valley in consideration of geographical features. Background technique [0002] As an important element of the coastline on nautical charts and island reef maps, its correct expression and effective simplification in the comprehensive scale transformation of the map are of great significance for navigation safety, coastal zone environmental analysis, and military strategic analysis. In the establishment of the "digital ocean" information technology system, it is often necessary to implement multi-scale and multi-resolution representations of coastal elements to meet the needs of data integration and adaptive visualization of cross-scale islands and reefs. The realization of this technology also requires the automatic simplification of coastlines. support. [0003] The earliest coastline simplificatio...

AI Technical Summary

Problems solved by technology

The existing methods regard the coastline as a purely geometric element, aiming at maintaining geometric features (such as feature points or main body trends, etc.), ignoring the analysis and processing of the geographical meaning behind the geometric features, and cannot correctly reflect the coastline. The geographic feature of the cartographic area where the line falls

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