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CN-122020825-A - Quick inversion method and device for real area of mass-transit landslide based on DEM gradient constraint

CN122020825ACN 122020825 ACN122020825 ACN 122020825ACN-122020825-A

Abstract

The invention relates to a mass-transit landslide real area quick inversion method and device based on DEM gradient constraint. The method comprises the steps of obtaining mass-sending landslide two-dimensional space vector data and DEM data, determining area gradient information based on the DEM data, determining plane projection area information based on the mass-sending landslide two-dimensional space vector data, determining a landslide center set based on the mass-sending landslide two-dimensional space vector data, determining a gradient value set based on the landslide center set and the area gradient information, constructing an inversion model from a two-dimensional projection area to a real slope area based on the plane projection area information and the gradient value set, and performing quick inversion processing on the plane projection area information based on the inversion model from the two-dimensional projection area to the real slope area to generate mass-sending landslide real area information. The method can improve the authenticity and the accuracy of landslide real area estimation.

Inventors

  • LI TAO
  • GAO HUIRAN
  • XU CHONG

Assignees

  • 应急管理部国家自然灾害防治研究院

Dates

Publication Date
20260512
Application Date
20260414

Claims (10)

  1. 1. The quick inversion method for the real area of the mass-transit landslide based on DEM gradient constraint is characterized by comprising the following steps: Acquiring mass-sending landslide two-dimensional space vector data and DEM data; Determining regional gradient information based on the DEM data; determining plane projection area information based on the mass-sending landslide two-dimensional space vector data; Determining a landslide center set based on the mass-sending landslide two-dimensional space vector data; Determining a slope value set based on the landslide center set and the regional slope information; based on the plane projection area information and the gradient value set, constructing an inversion model from a two-dimensional projection area to a real slope area; And carrying out quick inversion processing on the plane projection area information based on the inversion model from the two-dimensional projection area to the real slope area so as to generate mass-sending landslide real area information.
  2. 2. The rapid inversion method of mass-transit landslide true area based on DEM gradient constraint of claim 1 wherein said DEM data comprises a grid unit data set and said determining regional gradient information based on said DEM data comprises: For each grid unit data in the grid unit data set, performing spatial gradient analysis processing on the grid unit data to generate a grid gradient value; Each of the generated grid gradient values is determined as region gradient information.
  3. 3. The rapid inversion method of the real area of the mass-transit landslide based on the DEM gradient constraint of claim 1, wherein the mass-transit landslide two-dimensional space vector data comprises a polygonal landslide data set; And determining plane projection area information based on the mass-sending landslide two-dimensional space vector data, wherein the method comprises the following steps of: For each polygonal landslide data in the polygonal landslide data set included in the mass-sending landslide two-dimensional space vector data, determining a two-dimensional projection area corresponding to the polygonal landslide data; Each of the determined two-dimensional projection areas is determined as planar projection area information.
  4. 4. The rapid inversion method for the real area of the mass-transit landslide based on the DEM gradient constraint of claim 3, wherein the determining the landslide center set based on the mass-transit landslide two-dimensional space vector data comprises: Determining a landslide center of the polygonal landslide data for each polygonal landslide data in the polygonal landslide data set included in the mass-sending landslide two-dimensional space vector data; each determined landslide center is determined as a set of landslide centers.
  5. 5. The rapid inversion method of mass-transit landslide true area based on DEM gradient constraint of claim 1 wherein determining a gradient value set based on the landslide center set and the regional gradient information comprises: for each landslide center in the landslide center set, determining a corresponding gradient value of the landslide center based on the regional gradient information; The determined individual gradient values are determined as gradient value sets.
  6. 6. The rapid inversion method of real area of mass-transit landslide based on DEM gradient constraint of claim 1, wherein the constructing an inversion model from two-dimensional projection area to real slope area based on the plane projection area information and the gradient value set comprises: Based on the plane projection area information and the gradient value set, an inversion model from a two-dimensional projection area to a real slope area is constructed by the following formula: , Wherein, the The number of the landslide is indicated, Represent the first The real slope surface area of each landslide, Represent the first The two-dimensional projected area of the individual landslide, Represent the first Slope values of individual landslide.
  7. 7. The rapid inversion method of the real area of the mass-transit landslide based on the DEM gradient constraint of claim 1, wherein the rapid inversion processing is performed on the plane projection area information based on the inversion model from the two-dimensional projection area to the real slope area to generate the real area information of the mass-transit landslide, and the rapid inversion method comprises the following steps: determining the real slope area corresponding to each landslide center in the landslide center set based on an inversion model from the two-dimensional projection area to the real slope area, so as to obtain a real slope area set; And determining the real slope surface area set as mass-sending landslide real area information.
  8. 8. Quick inversion device of mass-transit landslide real area based on DEM slope constraint, its characterized in that includes: The acquisition unit is configured to acquire mass-sending landslide two-dimensional space vector data and DEM data; a first determination unit configured to determine region gradient information based on the DEM data; the second determining unit is configured to determine plane projection area information based on the mass-sending landslide two-dimensional space vector data; A third determining unit configured to determine a landslide center set based on the mass-sent landslide two-dimensional space vector data; a fourth determination unit configured to determine a gradient value set based on the landslide center set and the region gradient information; the construction unit is configured to construct an inversion model from a two-dimensional projection area to a real slope area based on the plane projection area information and the gradient value set; And the rapid inversion unit is configured to perform rapid inversion processing on the plane projection area information based on an inversion model from the two-dimensional projection area to the real slope area so as to generate mass-transit landslide real area information.
  9. 9. An electronic device, comprising: one or more processors; a storage device having one or more programs stored thereon; when executed by the one or more processors, causes the one or more processors to implement the method of any of claims 1 to 7.
  10. 10. A computer readable medium, characterized in that a computer program is stored thereon, wherein the computer program, when executed by a processor, implements the method according to any of claims 1 to 7.

Description

Quick inversion method and device for real area of mass-transit landslide based on DEM gradient constraint Technical Field The application relates to the technical field of quantitative evaluation and spatial information of geological disasters, in particular to a mass-transit landslide real area rapid inversion method and device based on DEM gradient constraint. Background The landslide area is one of the most basic and key quantitative indexes in landslide disaster assessment, and is widely applied to the works of landslide scale classification, volume estimation, disaster chain risk assessment and the like. Currently, in mass-sending landslide research and business application under triggering conditions such as earthquake or rainfall, the landslide area is usually obtained through automatic image recognition, remote sensing image interpretation or manual investigation, and is stored as vector data (such as Shapefile (vector graphic format)) in a two-dimensional plane form. In the prior art, a calculation method of a landslide area is generally a projection area of a landslide polygon on a horizontal plane, namely a two-dimensional projection area. However, the two-dimensional projected area of the landslide, rather than its true ground surface area on the slope, obtained in these ways ignores the effect of the terrain slope. The actual landslide tends to occur on a sloped terrain having a slope, with the actual sliding surface area being the area of space that spreads along the slope. In the high mountain Gu Ou, the slope of the slope on which the landslide is located is typically large, resulting in a more pronounced underestimation of the true landslide area, and the larger the slope, the more pronounced the area underestimation. Although some researchers have realized the influence of the gradient on landslide area estimation, in the prior art, most landslide databases still use the two-dimensional projection area as a standard statistical index, lack of a landslide real area calculation method which can be realized in batches in a GIS (Geographic Information System ) software environment and has the meaning of topography physical constraint, and have not formed a standardized technical flow suitable for unified processing of mass-sending landslide. Therefore, it is necessary to provide a landslide real area inversion method based on a GIS space analysis function and capable of introducing a DEM (Digital Elevation Model ) gradient constraint, so as to make up for the shortages of the prior art in landslide area calculation. At present, in regional mass-emission landslide hazard assessment induced by events such as earthquake, heavy rainfall and the like, the following technical problems exist in the acquisition and use of landslide areas: Firstly, the landslide area is systematically underestimated, the two-dimensional projection area of the landslide is obviously smaller than the real slope area of the landslide, and the projection area is directly used for scale classification, volume estimation or disaster evaluation, so that the evaluation result is lower, and the accuracy of quantitative analysis of the disaster is affected; secondly, the area calculation lacks of the physical constraint of the terrain, the existing GIS area calculation function is only based on plane geometry statistics, DEM gradient information is not included in the area correction process, the basic physical condition that landslide occurs on the inclined ground surface is ignored, and the area result lacks of the physical meaning of the terrain; Thirdly, the mass-sending landslide processing efficiency is low, while GIS software has the functions of gradient extraction, space superposition, attribute calculation and the like, when facing a large number of landslide plaques, multi-step space analysis operation and manual intervention are often needed, the flow is scattered, the efficiency is low, and a set of simple and repeatable technical route is lacked; fourth, the functional limitation of the existing analysis tools, and the existing partial GIS expansion tools or models are mainly used for landslide susceptibility evaluation, danger division or stability analysis, and a special technical method is not formed for the basic problem of 'geometric correction of landslide projection area to real slope area'. The above information disclosed in this background section is only for enhancement of understanding of the background of the disclosed concept and, therefore, may contain information that does not form the prior art that is already known to those of ordinary skill in the art. Disclosure of Invention The disclosure is in part intended to introduce concepts in a simplified form that are further described below in the detailed description. The disclosure is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used to limit the scope of the claimed subject matte