A Ridgeline Extraction Method Combining Morphological Features and Runoff Simulation

A technology of morphological features and extraction methods, applied in character and pattern recognition, computing, computer parts, etc., can solve the problem of poor comparability of ridge lines

Active Publication Date: 2022-06-28
SOUTHWEST PETROLEUM UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a ridgeline extraction method that combines morphological features and runoff simulation to solve the problem of poor comparability of the extracted ridgelines in the prior art due to the lack of clear threshold selection instructions, and to improve the extraction of ridgelines. Comparability, the purpose of improving the accuracy of ridgeline extraction

Method used

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  • A Ridgeline Extraction Method Combining Morphological Features and Runoff Simulation
  • A Ridgeline Extraction Method Combining Morphological Features and Runoff Simulation
  • A Ridgeline Extraction Method Combining Morphological Features and Runoff Simulation

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Embodiment 1

[0052] A ridgeline extraction method that combines morphological features and runoff simulation, such as figure 1 shown, including:

[0053] Step S1, calculating positive terrain based on DEM data, and determining the maximum positive terrain analysis window;

[0054] Step S2, calculating the membership degree of positive terrain based on the distribution map of positive terrain in different neighborhoods;

[0055] Step S3, according to the maximum positive terrain analysis window and the positive terrain membership degree, extract the positive terrain profile;

[0056] Step S4, on the basis of the positive terrain profile, obtain the simulated ridgeline through morphological analysis, and calculate its length;

[0057] Step S5, determining the optimal confluence threshold according to the simulated ridgeline;

[0058] Step S6, based on the optimal confluence threshold, extract the ridgeline by the runoff simulation method.

[0059] Preferably, the method for determining ...

Embodiment 2

[0073] A ridgeline extraction method combining morphological features and runoff simulation, the main process includes:

[0074] (1) Positive terrain calculation.

[0075] Positive terrain is a relatively high part within a certain range, which can be determined by the macroscopic shape factor P add area

[0076] point. when P When > 0, it is positive terrain, and its calculation formula is as follows:

[0077]

[0078] in H i,j is the elevation value of the grid at the center of the window, is the sum of the elevation values ​​of the valid rasters in the window, n is the number of valid grids in the window.

[0079] (2) The maximum positive terrain analysis window is determined.

[0080] In the process of positive terrain analysis, the size of the local neighborhood plays a crucial role in whether it is a positive terrain. This embodiment starts with the multiple neighborhood analysis of DEM, determines the law that the area of ​​positive terrain changes with th...

Embodiment 3

[0100] In order to verify the accuracy of the method of the present application, the present embodiment is based on the extraction method described in figure 2 Experiments were performed on the 6 typical plots shown.

[0101] figure 2The study area shown is Shaanxi Province (105°29′E~111°15′E, 31°42′N~39°35′N) located in the hinterland of northwest China, with a land area of ​​205,700 km2. The general feature of the terrain of Shaanxi Province is that it is high in the north and south and low in the middle. At the same time, the characteristics of the terrain sloping from west to east are also obvious. Beishan and Qinling divide Shaanxi into three natural areas: the northern part is the northern Shaanxi Plateau, including aeolian sand landforms, Loess Plateau (including plateaus, beams, ridges, hills and ravines, etc.) landforms. Precipitation is scarce and unevenly distributed, which is an ecologically fragile area. The frequency of drought is high and the soil erosion i...

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Abstract

The invention discloses a ridgeline extraction method combining morphological features and runoff simulation, including calculating the positive terrain based on DEM data, determining the maximum positive terrain analysis window; and calculating the membership degree of the positive terrain based on the positive terrain distribution maps in different neighborhoods; According to the maximum positive terrain analysis window and positive terrain membership degree, the positive terrain contour is extracted; on the basis of the positive terrain contour, the simulated ridgeline is obtained through morphological analysis, and its length is calculated; the optimal confluence threshold is determined according to the simulated ridgeline; The optimal confluence threshold is described, and the ridgeline is extracted by the runoff simulation method. The purpose of the present invention is to provide a ridgeline extraction method that combines morphological features and runoff simulation to solve the problem of poor comparability of the extracted ridgelines in the prior art due to the lack of clear threshold selection instructions, and to improve the extraction of ridgelines. Comparability, the purpose of improving the accuracy of ridgeline extraction.

Description

technical field [0001] The invention relates to the field of digital terrain analysis, in particular to a ridgeline extraction method combining morphological features and runoff simulation. Background technique [0002] Ridgeline, as one of the typical topographic structure lines, is a clear and objective topographic feature object, which has an obvious guiding role for geological work. The traditional topographic structure line extraction is mainly based on the extreme value judgment method of contour line and topographic section, skeletonization method and runoff simulation method. Among them, the extraction of ridgelines by the runoff simulation method has been widely used in the prior art. [0003] However, in the existing process of extracting ridgelines using runoff simulation methods, there is a lack of clear description of threshold selection, and the uncertainty of thresholds in this process makes the comparability of the extracted ridgelines poor. SUMMARY OF THE...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06V10/48
Inventor 胡金龙罗明良
Owner SOUTHWEST PETROLEUM UNIV
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