The core idea of spatial information multi-grid and the coding system areintroduced in brevity,transforms among the coordinates of the spatial points,the row,column of basic grid,the level of the coding and the code of a grid are used to create multiple levels grids for map spatial data,which is fulfilled by means of Visual Basic development platform and MapObjects of ESRI of the United States.
After the review and summation of the achieved progress and existing problems of geo-spatial information systems, the authors propose a new representation method for spatial data and spatial information -- the spatial information multi-grid (SIMG), which can not only easily run at grid computing env.
This paper introduces briefly the principle of the Spatial Information Multi-Grid(SIMG),a new representation method for spatial data and spatial information,which can not only easily run at grid computing environment,but also properly consider the differences of natural and social characteristics in earth space as well as the different levels of economical de.
An agent model is used for the occupant description,a geographical information system model is used for the architectural environment,and a cellular automata model is used for the drive and conversion.
The appearance and development of traffic flow cellular automata model points out a new direction for researching on traffic flow theory, and provides an available model tool for researching on system global behavior and complex phenomena of traffic flow dynamics theory.
The paper analyzed the principles and features of the some common models including lattice gas model,cellular automata model,social force model and magneto-mechanical model.
元胞自动机的构建没有固定的数学公式,构成方式繁杂,变种很多,行为复杂。故其分类难度也较大,自元胞自动机产生以来,对于元胞自动机分类的研究就是元胞自动机的一个重要的研究课题和核心理论,在基于不同的出发点,元胞自动机可有多种分类,其中,最具影响力的当属s. wolfram在80年代初做的基于动力学行为的元胞自动机分类,而基于维数的元胞自动机分类也是最简单和最常用的划分。除此之外,在1990年,howard a.gutowitz提出了基于元胞自动机行为的马尔科夫概率量测的层次化、参量化的分类体系(gutowitz, h. a. ,1990)。下面就上述的前两种分类作进一步的介绍。同时就几种特殊类型的元胞自动机进行介绍和探讨s. wolfrarm在详细分忻研究了一维元胞自动机的演化行为,并在大量的计算机实验的基础上,将所有元胞自动机的动力学行为归纳为四大类(wolfram. s.,1986):