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A Basin Water Extraction Method Combining Spectral Characteristics and Confluence Accumulation

A water body extraction and spectral feature technology, applied in the field of remote sensing image water body information interpretation, can solve the problems of difficulty in determining the best threshold for water extraction, limited DEM accuracy, and inability to respond well, achieving good applicability and reducing false positives. Positive, high-precision effects

Active Publication Date: 2022-08-05
HOHAI UNIV
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Problems solved by technology

This method is simple and easy, and can directly generate connected river networks, but it is often difficult to determine the optimal threshold for extracting water systems, and is limited by the accuracy of DEM. The water systems extracted by this method often cannot well reflect the distribution of actual water systems.
Existing water extraction methods based on spectral features will produce a large number of false positive errors (FP, False Positive)

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  • A Basin Water Extraction Method Combining Spectral Characteristics and Confluence Accumulation
  • A Basin Water Extraction Method Combining Spectral Characteristics and Confluence Accumulation
  • A Basin Water Extraction Method Combining Spectral Characteristics and Confluence Accumulation

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Embodiment Construction

[0046]In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0047] In view of the problems in the background technology, combined with "the first turning point of the slope-confluence accumulation correlation diagram symbolizes the transition from divergent topography to convergent topography, it also indicates the change of the water-dominant generation process (Kirkby, 1986; Tarboton et al. , 1992; Georgiou, 1993)", it can be considered that the confluence accumulation at the first turning point of the slope-confluence cumulant correlation diagram represents the minimum confluence accumulation limit of the generated water body. By correcting the water body map, the identification errors in the water body map can be reduced, and the accuracy and scientificity of the water body identification can be incre...

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Abstract

The invention discloses a method for extracting a water body in a river basin by combining spectral features and accumulation of confluence. The multi-spectral image of Sentinel No. 2 is used to identify the water body in the river basin and output the corresponding water body map; the average slope and confluence of the corresponding river basin are obtained by using DEM data. Accumulate and analyze the relationship between the average slope-confluence accumulation in the watershed; finally use the confluence accumulation at the first turning point of the correlation between the average slope-confluence accumulation as the minimum to form a water body to correct the water map, and get a more accurate Watershed map. The invention has the advantages of high calculation accuracy, wide application range, more scientific and reasonable results, etc., and is beneficial to accurately obtain the distribution of water bodies in the basin.

Description

technical field [0001] The invention relates to the technical field of remote sensing image water body information interpretation, in particular to a basin water body extraction method combining spectral characteristics and confluence accumulation. Background technique [0002] Surface water is an important part of the earth's water cycle, and it is very important to obtain the distribution of surface water in a watershed for hydrological analysis. Due to the huge workload of field labeling, the extraction of surface water bodies in the basin is generally carried out by digital methods. At present, optical remote sensing images have become a routine means of surface water monitoring, and the data collected can provide macroscopic, real-time, and dynamic water distribution information with high cost-effectiveness. [0003] McFeeters proposed the Normalized Difference Water Index (NDWI, Normalized Difference Water Index) in 1996. This method utilizes the difference in reflect...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06V20/13G06V10/40
CPCG06V20/13G06V10/40
Inventor 费俊源刘金涛吴鹏飞刘杨洋
Owner HOHAI UNIV
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