Identification method of tree-like water system

Abstract

The invention discloses an identification method of a tree-like water system. The method comprises the following steps: (1) acquiring shp-format line layer data of a water system to be recognized, andreading into a data set L={l|i=0, 1, 2,...,m, wherein l represents an ith river element of which the attributes include a river length Len and a marker attribute Flag=0, and m is the number of river elements; (2) calculating the azimuth angle of each river element based on the end point coordinates of the river elements; (3) calculating included angles between two intersecting river elements according to the azimuth angle of each river element; and (4) if the proportion of sharp angles in the included angles between two intersecting river elements is larger than a preset threshold, judging that the river system to be identified is a tree-like water system, otherwise judging that the river system to be identified is a non-tree-like water system. The tree-like water system is identified on the basis of vector data, so that the identification method has relatively low algorithm complexity, high automation degree and relatively high recognition accuracy.

Description

technical field [0001] The invention relates to the application field of geographic information technology, in particular to a vector data-based automatic recognition method for tree-shaped water systems. Background technique [0002] The same type of water system in nature often has similar geological structure and natural environment in its area. By analyzing the arrangement and plane shape of the water system, the geological structure and crustal movement of the area where the water system is located can be roughly inferred. Therefore, the rapid and accurate interpretation of water system types has important research significance. [0003] The common types of water systems include dendritic water systems, lattice water systems, plume water systems, parallel water systems, radial water systems, centripetal water systems, and braided water systems. At present, the identification method of water system type is mainly manual identification. Although this method is simple an...

AI Technical Summary

Problems solved by technology

Although the automatic recognition method of relevant water system types can carry out a certain recognition of water system types, because it uses binary water system images instead of directly using water system vector data, the complexity of the algorithm is high and the recognition effect is poor

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