Method for automatically identifying basins in DEM data

Abstract

The invention discloses a method for automatically identifying basins in DEM data. The method includes the following steps that 1, the altitude values of DEM grid points in the DEM data are extracted, the values of the terrain fluctuant degrees of the DEM grid points are calculated, and a binary labelling image formed by plain points and mountain points is formed; 2, the plain points with the areas and the shapes smaller than preset values in the binary labeling image are filtered out with binary morphology; 3, a closure calculation function of the basin is built, the closures that the plain points are closed by the surrounding mountain points in the binary labeling image are calculated, and the plain points with the closure larger than a preset closure threshold value TC are selected as primarily-selected basins; 4, the primarily-selected basins with the areas larger than a preset area threshold value TA and the relative height difference larger than a preset relative height difference threshold value TD are selected from the primarily-selected basins to serve the final basins, and a final basin labeling image is obtained. By means of the method, the basins can be labeled in the DEM data.

Description

technical field [0001] The invention relates to the technical field of automatic division of landform types in the field of digital terrain analysis, and relates to an automatic identification method for basins in DEM data. Background technique [0002] Terrain and landform are important geographical elements, and the classification and identification of landform types based on Digital Elevation Model (DEM) is one of the important research directions of digital terrain analysis in geomorphology. my country has a vast territory and complex landform composition. The study of rich and diverse landform types plays an extremely important role in understanding the formation and development of the natural geographical environment. Basin is an important landform type. It is composed of plains, hills and mountains. It is high around, low in the middle, and shaped like a basin. It is usually called the periphery of the basin and the center of the basin. The terrain around the basin i...

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Problems solved by technology

[0004] To sum up, there are quite a lot of research results on the division of landforms in China based on DEM. However, these methods either mark the landforms as basic landform types such as plains, hills, and mountains at the macro level, or mark the landforms as mountain tops and ridges at the micro level. , valleys, plains and depressions, no research on automatic identification methods for basin geomorphology

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