Basin underlying surface feature extraction method based on computer vision technology
A computer vision and feature extraction technology, applied in computer parts, computing, instruments, etc., can solve problems such as loss of spatial information, and achieve the effect of avoiding the loss of spatial information and fully and quickly characterizing
Active Publication Date: 2022-03-25
CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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Both of these two types of feature expression methods will bring about the problem of loss of spatial information.
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Embodiment 1
[0067] 1) Collection and preprocessing of data on the underlying surface of the watershed.
[0068] 1-1 Collect the underlying surface data of the study area, including but not limited to digital elevation data, land use data, soil data, and normalized difference vegetation index data. The data form is raster data. The higher the spatial resolution of the raster data is, the better it is. The size of the visible watershed area should be adjusted appropriately. If the spatial resolution is too low, the feature extraction effect will be poor.
[0069] 1-2 Preprocess the digital elevation data. The preprocessing of the digital elevation data is mainly the analysis of the flow direction and slope of the watershed, where the flow direction calculation adopts the D8 algorithm, and the slope value is expressed by the percentage method;
[0070] 1-3 Preprocess the land use data. The preprocessing of the land use data is mainly to map the land use type to the SCS-CN value to express th...
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The invention discloses a drainage basin underlying surface feature extraction method based on a computer vision technology. The method comprises the following steps: 1) collecting and preprocessing drainage basin underlying surface data; 2) converting the underlying surface data into a grey-scale map; 3) performing color feature extraction based on the color aggregation vector; 4) performing shape feature extraction based on the image moment; 5) performing texture feature extraction based on a local binary pattern; and 6) constructing a drainage basin underlying surface feature vector set. Different from a previous drainage basin underlying surface expression mode adopting statistical values or feature indexes and coefficients, the invention provides a method for extracting drainage basin underlying surface features by using a computer vision technology, and the method can express the drainage basin underlying surface features in a feature vector form, so that more feature information is contained, and the extraction efficiency is improved. Especially, loss of spatial information in the feature extraction process is avoided, and the underlying surface feature extraction and expression method is more accurate and rapid.
Description
technical field [0001] The invention belongs to the technical field of water conservancy engineering, in particular to the technical field of hydrogeography, and specifically relates to a method for extracting features of the underlying surface of a watershed based on computer vision technology. Background technique [0002] The condition of the underlying surface of a watershed is one of the decisive factors for its hydrological process. Therefore, the accurate description of the characteristics of the underlying surface of a watershed is an important basis for the study of the flow generation and confluence mechanism of the watershed, the simulation of the hydrological process, and the flood forecast. [0003] At present, there are usually two ways to express the characteristics of the underlying surface of the watershed: one is the statistical value, such as the average elevation of the watershed, the average slope, the average soil depth, forest coverage, etc.; the other ...
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Login to View More IPC IPC(8): G06V20/10G06V10/56G06V10/54G06V10/44G06V10/50
CPCY02A10/40
Inventor 王帆张大伟向立云白钰张丹杜晓鹤
Owner CHINA INST OF WATER RESOURCES & HYDROPOWER RES