Abstract
Three-dimensional (3D) buffer analysis is among the basic functions of 3D spatial analysis, and it plays an important role in 3D geographic information systems. The rapid development of the 3D Discrete Global Grid System (DGGS) provides a new method for the 3D spatial analysis of geographic information. According to the spatial topology characteristics of the 3D DGGS and the concept of dimensionality reduction, a 3D buffer analysis method based on the spatial grid of the Earth system is proposed to solve the problem of the buffer algorithm of a space object being unsatisfactory at present. In this paper, we present a method to calculate the distance between cells based on the side length of the spherical grids according to the geometric characteristics of the grids. For the grids of a geographic object, we describe the Euclidean distance expansion algorithm and the radial elevation expansion algorithm that helped us to obtain its 3D buffer. Finally, in terms of algorithm complexity and visualization effect, compared with the traditional raster buffer algorithm, the method presented in this paper has lower complexity, an improved visualization effect, and stronger generality.
Highlights
Spatial analysis is among the core functions of geographic information systems, and it is important for evaluating the function of geographic information systems
With the growing interest in Digital Earth and the subsequent use of the 3D Discrete Global Grid System (DGGS) to meet the needs of efficient indexing, analysis, and visualization of 3D data, in this paper, we propose a new method to generate a 3D buffer to analyze the proximity of spatial objects, for which we chose the Sphere Geodesic Octree Grid (SGOG) as the data model
The Digital Elevation Model (DEM) data of a certain area in Xinyang City, Henan Province were selected to test the feasibility of the 3D buffer generation algorithm for volume objects
Summary
Spatial analysis is among the core functions of geographic information systems, and it is important for evaluating the function of geographic information systems. Buffer analysis is an important part of spatial analysis. It describes the influence of geo-spatial objects on the surroundings, and it is an effective means to solve the problem of spatial proximity [1]. From a mathematical point of view, the basic concept of buffer analysis is to determine the neighborhood of a given buffer radius and a spatial object or collection. As the expression results of buffer analysis are intuitive and conducive to monitoring, buffer analysis plays an important role in mineral resource evaluation, road traffic management, urban planning, environmental monitoring, and many other fields [2,3,4,5]
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