Method for optimizing land subsidence monitoring net

Abstract

The invention relates to a method for optimizing a land subsidence monitoring net. The method includes the following steps that firstly, a ground monitoring net is built, wherein a GPS point and a benchmark are arranged in a land subsidence area, a GPS and a leveling monitoring net are built, and therefore a land subsidence monitoring point is obtained; secondly, an air-land monitoring net is built, and the air-land monitoring net is formed by merging an optimized PSInSAR monitoring point, the benchmark and the GPS point, wherein obtaining of the optimized PSInSAR monitoring point includes the step of obtaining the PSInSAR monitoring point through the PSInSAR technology and obtaining three cloud numerical characteristics of the PSInSAR monitoring point through the cloud model algorithm. According to the method for optimizing the land subsidence monitoring net, the land subsidence monitoring capability can be improved, high-precision land subsidence monitoring information can be obtained, and the property safety and the life safety of the masses are protected.

Description

technical field [0001] The invention belongs to the field of geological disaster monitoring, in particular to a method for optimizing a land subsidence monitoring network. Background technique [0002] Land subsidence is an environmental geological phenomenon caused by the lowering of ground elevation, which will cause permanent loss of environmental resources. According to statistics, 95 cities in my country have experienced land subsidence, with a total area of ​​48,655 square kilometers. With the continuous development of the city, the hazards of land subsidence, especially uneven ground subsidence, have gradually become prominent. The subsidence causes the building base to be out of balance, and even induces the collapse of the entire building. At the same time, it will also have a great impact on underground facilities. [0003] Conventional land subsidence monitoring methods mainly include leveling, stratification and GPS measurement. With the development of earth obse...

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Problems solved by technology

[0003] Conventional land subsidence monitoring methods mainly include leveling, stratification and GPS measurement. With the development of earth observation technology, Synthetic Aperture Radar Interferometry (InSAR, Interferometric Synthetic Aperture Radar) technology is applied to land subsidence monitoring. In the interferogram formed by two SAR images, the image phase includes the terrain phase of the region and the deformation of the ground during the observation period, and what we want is only the deformation information of the surface, so the terrain information of the region must be removed, so further Extended the synthetic aperture radar differential interferometry (DInSAR, Differential Interferometry Synthetic Aperture Radar) technology, DInSAR technology has the advantages of wide coverage, high resolution, all-weather, etc., but the accuracy of monitoring points is reduced due to the influence of phase loss correlation and atmospheric delay

Permanent Scatterer Interferometry (PSInSAR, Permanent Scatterer Interferometry Synthetic Aperture Radar) technology extracts surface deformation information by analyzing permanent scattering points with stable scattering characteristics, which solves the shortage of DInSAR to a certain extent, but conventional PSInSAR technology has too many parameters to deal with. In the case of a large area, the estimation of the atmosphere will not be accurate enough, and there are certain errors in data collection and processing that lead to unreliable monitoring points, which has certain limitations on the unevenness of subsequent land subsidence

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