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A Slope Length Extraction Method Based on SRTM

An extraction method and technology of slope length, applied in the field of digital terrain analysis, can solve the problem that slope length cannot be directly extracted, and achieve the effect of avoiding format conversion and coordinate transformation process, improving extraction efficiency, and avoiding precision loss.

Active Publication Date: 2021-11-02
NORTHWEST A & F UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a method for extracting slope length based on SRTM, which solves the technical problem that the SRTM data cannot be used to directly extract the slope length in the prior art

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  • A Slope Length Extraction Method Based on SRTM
  • A Slope Length Extraction Method Based on SRTM
  • A Slope Length Extraction Method Based on SRTM

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Embodiment 1

[0070] This embodiment provides a method for extracting slope length based on SRTM, and the specific process is divided into the following steps:

[0071] Step 1: Store the value of the header information cellsize of the SRTM data, and at the same time obtain the slope value and flow direction of each grid in the SRTM data. Specifically include:

[0072] 1.1 Data Input

[0073] (1) Read data header information: Create a structure, read all header information of SRTM data by row, and store them in the corresponding attributes of the structure.

[0074] (2) Read SRTM elevation data. Store the elevation data converted into float type into the elevation data matrix. For the convenience of calculation and to ensure the consistency of the surrounding grids of each data, the data is expanded by two circles, so the data is put into a matrix expanded by two circles used for calculations.

[0075] 1.2: No value point, depression filling.

[0076] 1.3: Traverse the two-dimensional a...

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Abstract

The invention proposes a method for extracting slope length based on SRTM. By establishing a grid model under geographic coordinates, the calculation method of the side length of the SRTM grid is directly deduced from the model. When calculating the slope length, the influence of slope truncation and river network truncation is taken into consideration, so that the result is as close as possible to the actual situation. Finally, the cumulative slope length of SRTM is calculated by forward and reverse traversal. Compared with the traditional method, this method no longer undergoes projective coordinate transformation, thereby improving the extraction efficiency of slope length; at the same time, it can also ensure that the accuracy of the original data does not decrease, and the slope length extraction result is relatively accurate. The slope length result is consistent with the existing DEM calculation The comparison of the results shows that the range of slope length difference is concentrated and regular.

Description

technical field [0001] The invention relates to a digital terrain analysis technology intersected by erosion, geography, and computer science, in particular to an SRTM-based slope length extraction method, and designs and implements a slope length extraction method based on SRTM geographic coordinates. Background technique [0002] Slope length is an important factor affecting soil and water conservation and soil erosion research. In USLE, slope length is defined as the horizontal distance from the start of overland flow to the cutoff of runoff or interruption of flow path. It is terminated (cut off) in the following two situations: (1) when the slope becomes gentle so that sedimentation occurs, it is called slope cutoff (Slope Cutoff Factor, SCF); (2) where there is an obvious river network, it is called river network cutoff factor (Chanel Networks Cutoff Factor CNCF). At the slope scale, usually the slope and slope length can be actually measured. In watershed or region...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20
Inventor 张宏鸣杨勤科常毅张国良孙红光张凡许伊昆董良张泉
Owner NORTHWEST A & F UNIV