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Loess plateau terrace extraction method based on ray method

A technology of the Loess Plateau and extraction method, applied in image data processing, instruments, calculations, etc., can solve the problems of interpretation, lack of overall morphological characteristics of terraces, easy formation of broken patches, etc., and achieve universal adaptability and innovative effects.

Active Publication Date: 2017-08-18
NANJING NORMAL UNIVERSITY
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Problems solved by technology

This method is simple and innovative, but its classification results are not universal, it is easy to form broken patches, and it lacks the interpretation of the overall morphological characteristics of terraces

Method used

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  • Loess plateau terrace extraction method based on ray method
  • Loess plateau terrace extraction method based on ray method
  • Loess plateau terrace extraction method based on ray method

Examples

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Embodiment

[0034] Example: A method for extracting terraced fields from the Loess Plateau based on the ray method. The experimental sample area of ​​this example is located in Jiuyuangou, Suide, Shaanxi, near longitude: 110°20′, latitude: 37°35′, which belongs to the loess hilly gully The first sub-area of ​​the district is the key experiment area of ​​water and soil conservation of the Yellow River Water Conservancy Committee. In this area, the source erosion of valleys is strong, and the terraced fields are widely distributed and relatively well preserved. The experiment selected a section of continuous and irregularly shaped terraces as the experimental data. The experimental data is a panchromatic band remote sensing image with a resolution of 0.6 m, such as Figure 7 As shown, this experiment is to extract the terraces in the picture frame.

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Abstract

The present invention provides a loess plateau terrace extraction method based on a ray method. The method comprises: analyzing the arrangement mode and the extension direction of a terrace ridge; taking a mountaintop point as an initial position according to the arrangement features of the terrace ridge, and analyzing and calculating the changing rule of picture element gray values of positions where each ray light passes through taking the mountaintop point as a summit; and finally, based on the discontinuity of the terrace, the extension direction of the terrace and the ridge width feature, employing the signal processing method to set corresponding rules, removing inexistent terraces or terrace pixels which are too much broken, retaining clear and continuous terrace pixels and obtaining a terrace distribution map. The loess plateau terrace extraction method based on the ray method can effectively extract the terrace range from high-resolution remote sensing images, can perform extraction of the terrace range according to the concrete direction, the width and the quantity of the terrace ridge arrangement, and has general adaptability and innovation.

Description

technical field [0001] The invention relates to a method for extracting terraced fields, in particular to a method for extracting terraced fields based on a ray method. Background technique [0002] The Loess Plateau suffers from serious water and soil erosion, and the per capita arable land area is small. Terraced fields are artificial landforms built for agricultural farming or water and soil conservation. Building sloping farmland into horizontal terraced fields can effectively conserve water, soil, and fertilizer, and enhance drought resistance. The transformation of terraced fields on the natural surface has resulted in changes in land use types and soil erosion methods. Therefore, terraced fields have important research significance in geomorphology, land use surveys, and soil and water conservation. In recent years, the research on the soil and water conservation and land use of terraces has been deepening, but the research on the extraction of terraces is slightly i...

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Application Information

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IPC IPC(8): G06T5/20G06T5/00G06T7/13G06T7/62
CPCG06T5/20G06T2207/30188G06T2207/10032G06T5/73
Inventor 刘玮李发源马锦李晨瑞
Owner NANJING NORMAL UNIVERSITY
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