Abstract
With the continuous development of social economy, the expansion of cities often leads to the disorderly utilization of land resources and even waste. In view of these limitations and requirements, this paper introduces the automatic extraction algorithm of closed area boundary, combs the requirements of urban boundary extraction involved in urban planning and design, and uses the technology of geospatial analysis to carry out spatial analysis practice from three angles, so as to realize the expansion of functional analysis of urban planning and design and improve the efficiency and rationality of urban planning. The simulation results show that the automatic extraction algorithm of closed area boundary is effective and can support the functional analysis of urban planning and design expansion.
Highlights
With the continuous development of social economy, urbanization is an important trend, but disorderly urbanization will cause the waste of urban land resources, and destroy the ecological environment to a certain extent [1, 2]. erefore, many industry experts have put forward the concept of combining design with nature; that is, reasonable design and planning are needed to transform nature rather than destroy nature [3, 4]. e development of Internet information technology has innovated the means of urban planning and design, so that more schemes can be used for two-dimensional, three-dimensional, and other multiangle reference
Its main feature is the powerful spatial analysis function. erefore, for urban planning, the powerful spatial analysis function is helpful for design to avoid unnecessary loss or expenditure [5, 6]
It is a basic graph, which uses the corresponding closed objects to create the closed area. e specific types of creation can be a straight line segment, broken line segment, arc segment, ellipse, spline segment, etc. It can realize three functions: (1) testing the closure of graphics: the closed regions can be transformed into a complete graphics; if the graphics are not closed, they cannot be transformed directly; (2) realizing the corresponding parameter calculation of the region, such as the center of gravity and area of the region; (3) creating the corresponding three-dimensional model: if the plane graphics are transformed into regions, the lifting of threedimensional graphics and the formation of three-dimensional effect can be realized
Summary
With the continuous development of social economy, urbanization is an important trend, but disorderly urbanization will cause the waste of urban land resources, and destroy the ecological environment to a certain extent [1, 2]. erefore, many industry experts have put forward the concept of combining design with nature; that is, reasonable design and planning are needed to transform nature rather than destroy nature [3, 4]. e development of Internet information technology has innovated the means of urban planning and design, so that more schemes can be used for two-dimensional, three-dimensional, and other multiangle reference. Since 1990, with the increasing maturity of spatial processing technology and the popularization of computer mapping, GIS technology has been widely used in the field of urban planning. It can graphically express spatial data and spatially analyze attribute data on a certain basis. Advances in Multimedia of automatic extraction of closed area boundary, combs the relevant businesses of urban planning and design, carries out spatial analysis from three angles from the perspective of geospatial technology, and realizes urban planning and design, in order to build corresponding expansion functions and improve the efficiency and effect of urban planning and design
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