地理信息系统名词（Geographic information system noun）.doc

地理信息系统名词（Geographic information system noun） The data structure of the quadtree is to divide the spatial region into four quadrants (2n by 2n, and n is greater than 1) until the numerical monotone of the subquadrant. A flat unit, regardless of unit size, as the last storage unit. In this way, the size of the area grid of the same kind of space is different from that of the element distribution. (huang xingyuan, ma jinsong, tang qin, introduction to geographic information system) Irregular triangular mesh model, referred to as TIN, it according to the area of a finite number of points that connected the area is divided into triangle plane network, any point in a region falls on the edge of the triangle vertices, below or within the triangle. If the point is not at the vertex, the elevation value of the point is usually obtained by a linear interpolation (the elevation of the two vertices on the side, and the elevation of three vertices in the triangle). (wu lun, principles, methods and applications of geographic information systems) Topological relation is the spatial relationship between the element node, arc and surface domain of network structure, which mainly manifests as topological adjacency, topological association and topological inclusion. According to the topological relationship, it is not necessary to use coordinates or distances to determine the location relationship of a geographical entity relative to another, and topological data is also conducive to the query of spatial elements. (wu xinhe, principles and methods of geographic information system) The tour code is a grid combination of adjacent adjacent values, and records the values of the combined grid and the length of the combined grid. The purpose is to compress the grid data and eliminate redundancy between data. (huang xingyuan, ma jinsong, tang qin, introduction to geographic information system) Spatial data structure refers to the logical structure that is suitable for the storage, management