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3D geological modeling data can only be measured rarely or indirectly, as it is necessary to interpolate the sparse and uneven geological data in the study area. Given the problems in the interpolation of data from different sources, we have introduced stratum interpolation and visualization technology based on the moving least squares (MLS) method and Poisson surface reconstruction method. The MLS method can not only obtain a smooth stratum surface by adjusting the relevant parameters of its interpolation, but it can also ensure the similarity of the stratum in space and the difference when far part. At the same time, it combines the Poisson reconstruction method and improves it, so that it can reconstruct the open surface by using a virtual outer frame from the original closed figure reconstruction theory. This paper takes the exploration line profile and geological boreholes in Xiushan County, Chongqing as an example, and visualizes them by fusion and the interpolation of data from different sources. The resulting stratum surface is smooth, continuous, accurate, and highly portable. [ABSTRACT FROM AUTHOR]

When 3D modeling of the geological body is carried out based on the section, problems such as unable to close the structural plane, slow rendering speed of the model and uneven and long and narrow section triangle network will occur due to the situation of super near point or too dense fold point. To solve the appealing problem, this paper proposes a section thinning-densification method based on the Douglas Peucker algorithm and equidistance algorithm. When processing the original section data, the Douglas Peucker algorithm is used for thinning, and then the equal distance is used for density increase. In this way, the section obtained by thinning-densification method solves the problem of uneven break points on the original section line and does not affect the shape of the section line, effectively solving the problem caused by too dense or too sparse break points on the section line in 3D geological modeling Series of modeling problems. In this paper, through the research on the modeling method of the above ground structure, the application demonstration of the above-ground and underground integrated three-dimensional model construction in Chengdu International Biological city is carried out, which verifies that the above-ground and underground integrated three-dimensional model construction technology is feasible and applicable and worthy of promotion. [ABSTRACT FROM AUTHOR]

Since the development of underground space has the characteristics of "difficult to recover, one-off, and difficult to budget", the planning of underground space is particularly important. Traditional two-dimensional planning technology is difficult to describe three-dimensional spatial information such as underground complex geological environment, and three-dimensional GIS technology can solve this problem better, which can greatly enrich the urban planning, construction, and management control methods. This paper uses a combination of GIS software to carry out the three-dimensional geological modeling of above-ground and underground integration in the study area, and puts forward application suggestions for the underground space planning of the area, providing support for decision-making support for the government and relevant departments. and provide a demonstration for other cities to carry out urban geological survey work. [ABSTRACT FROM AUTHOR]