Research On The Construction Of Spatial And Temporal Ground Settlement Deformation Field And Dynamic Evolution Method

With rapid economic development,long-term over-exploitation of underground resources and extensive building construction have led to widespread ground subsidence,which seriously affects the sustainable development of cities.In order to effectively control and prevent land subsidence,relevant departments have also devoted a lot of energy to monitoring and statistics of land subsidence.Precision level measurement is one of the observation means that can accurately detect the ground elevation change,and the input cost is low,and it is easy to obtain multi-period data,however,affected by the monitoring point location,monitoring conditions,cost and other factors,the monitoring point cannot cover the whole monitoring area,so the level observation data is discontinuous and discrete.Moreover,simple subsidence data are rather abstract,and much of the information implicit in the data is difficult to observe from a single value,which cannot visually express the extent and dynamic changes of ground subsidence.Therefore,it is worthwhile to solve the problem of how to use the multi-period discrete observation data in a reasonable,effective and scientific way,and to explore the potential information value in the data from the spatial and temporal perspectives and express it in the geographic scenes in an accurate and intuitive way,so as to provide effective data support for ground subsidence prevention and control.In this paper,we propose to construct a spatio-temporal ground settlement deformation field to fit the overall effect of regional ground deformation from the perspective of multi-period measured data application,and design a spatio-temporal field data dynamic evolution scheme to describe the dynamic changes of spatio-temporal field data in geographic scenes,and finally design a three-dimensional ground settlement visualization system based on the above research and conduct experimental verification.The main research is summarized as follows:(1)Construction of spatio-temporal ground settlement deformation field.In view of the problem that the level settlement monitoring data are discontinuous and discrete,and cannot express the regional ground settlement changes intuitively,a method of constructing the spatiotemporal ground settlement deformation field is proposed from the perspective of the application of multi-period measured data,and the relationship between the ground settlement amount and coordinates and time is explored by introducing the time term on the basis of polynomial fitting to establish the spatial deformation field,so as to obtain the optimal spatiotemporal ground settlement deformation field model,so as to fit the overall effect of regional ground deformation.(2)Spatio-temporal field data dynamic evolution scheme design.A tensor-based scheme for describing the dynamic evolution of spatio-temporal field data is proposed.A tensor Tucker decomposition-based spatio-temporal data organization framework is constructed,and the correlations between spatio-temporal data dynamic evolution attributes and their correlations with time are designed to achieve accurate representation of spatio-temporal data dynamic changes in geographic scenes.It also uses the dynamic evolution description document for streaming transmission,thus reducing the pressure of network transmission and rendering,and realizing the smooth rendering and dynamic representation of spatio-temporal field data in the scene.(3)Develop an integrated ground subsidence 3D visualization system.Based on the research results of this paper,a 3D visualization system for ground subsidence was designed and developed to experimentally validate the proposed theoretical approach.At present,the prototype system has been put into use in an actual project,focusing on serving the ground settlement monitoring field and realizing the scientific and visual management and application of ground settlement monitoring data.