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Multi-flow-direction drainage basin feature extraction method based on hexagonal grid

A feature extraction and hexagonal technology, applied in the field of feature extraction of multi-flow basins based on hexagonal grids, can solve the problems that the single-flow algorithm cannot reflect the divergent water flow on the slope and cannot truly describe the water flow characteristics.

Pending Publication Date: 2021-11-23
CHINA UNIV OF MINING & TECH (BEIJING)
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Problems solved by technology

Therefore, the uniflow algorithm cannot reflect the divergent flow conditions on the slope, and cannot truly describe the flow characteristics

Method used

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  • Multi-flow-direction drainage basin feature extraction method based on hexagonal grid
  • Multi-flow-direction drainage basin feature extraction method based on hexagonal grid
  • Multi-flow-direction drainage basin feature extraction method based on hexagonal grid

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Embodiment Construction

[0045] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and examples.

[0046] Such as figure 1 As shown, a hexagonal grid-based multi-flow basin feature extraction method includes the following steps:

[0047] S1: DEM construction based on hexagonal grid, including the following sub-steps:

[0048] S11: According to the regular grid DEM resolution, determine the subdivision level of the spherical hexagonal grid, and generate a regular icosahedral hexagonal grid according to the Snyder equal-area projection, such as figure 2 as shown in a;

[0049] S12: Determine the hexagonal grid involved in the calculation according to the range of the regular grid DEM;

[0050] S13: Using the bilinear interpolation method, calculate the height of the vertices of the hexagonal grid, such as figure 2 as shown in b;

[0051] S14: Ob...

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Abstract

The invention discloses a multi-flow-direction watershed feature extraction method based on a hexagonal grid, and the method comprises the steps: firstly converting a regular grid DEM into a spherical hexagonal grid for representation according to a bilinear interpolation method, and carrying out the calculation of a vertex elevation and a central point elevation of the hexagonal grid; then connecting the vertexes and the center points in sequence, dividing each hexagonal grid into a triangle, calculating the elevation of the center point of each triangle, and determining the water flow direction according to the elevation difference between the triangle and the adjacent hexagonal grid; calculating the grid flow according to the elevation difference proportion of the adjacent hexagonal grid; and finally, traversing the grid, and tracking a drainage basin path. According to the method, a hexagonal grid is used as a basic grid, so that the problem of terrain expression imbalance caused by inconsistent distances of edge adjacent and corner adjacent grids in regular grid DEM-based drainage basin feature extraction is solved; the flow direction and the flow are determined by using the elevation difference proportion of the triangle and the adjacent hexagonal grid, and the problem that the original hexagonal single-flow-direction algorithm cannot truly describe the water flow characteristics is solved.

Description

technical field [0001] The invention relates to the technical field of watershed hydrological feature extraction, in particular to a multi-flow direction watershed feature extraction method based on a hexagonal grid. Background technique [0002] The extraction and analysis of watershed hydrological features is an important part of hydrology and water resources, and it provides important basic information for hydrological modeling, topography modeling, water and soil erosion assessment, and water resource management. The transfer path of horizontal confluence is usually expressed by hydrological elements such as flow direction, runoff node, runoff network and watershed boundary. Among them, the direction of water flow is the basis for the extraction of hydrological features of the watershed. [0003] With the improvement of DEM data acquisition ability, the hydrological feature extraction based on DEM has been widely studied. Among them, DEM based on regular grid has becom...

Claims

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Application Information

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IPC IPC(8): G06K9/00G06T3/40G06T17/05G06T17/10G06T17/20
CPCG06T3/4007G06T17/05G06T17/10G06T17/205Y02A10/40
Inventor 罗富丽孙文彬赵学胜范德芹李亚路段远征
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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