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An improved method based on balloon snake for road contour extraction is proposed, the method initializes the road contour with the output of centerline detection and introduces an adjustable expansion coefficient, which is being tuned according to image gradient and contour curvature during road contour extraction process, the improved method can recover some missing road segments and solves the...
Urban planning management plays an important role in effective integration, standardized administration and authorized share of planning data, which could effectively resolve universal problems such as nonstandard format, resources dispersion, etc. This paper started from the real requirement of urban planning bureau, to carry out researches of business process analysis, planning database design,...
This paper describes an improved version of D* algorithm and discusses how to apply this algorithm to intelligent path planning for virtual humans in complex and dynamic three-dimensional scene. Based on dividing the search space with navigation meshes, the improved D* algorithm can quickly calculate the optimal path from an starting position to the target position, and then guides virtual humans...
Forest fires caused serious damage to socioeconomic by burning a tract of forest trees, and even they threaten human's life. The spatial distribution patterns of the historical forest fires can clearly explain the character of the fires spatial distribution. With the development of computer technology and Geographic Information Science (GIS), we can identify the spatial distribution patterns of the...
A new methodology of distributed mobile geographic information system (GIS) grid model is studied based on mobile agent and grid computing environment. Key technologies are presented in the model, including mobile agent (MA) distributed computing, grid computing, mobile GIS, global positioning system (GPS), transfer control protocol/internet protocol (TCP/IP), and user datagram protocol (UDP). In...
In this paper, we present an algorithm to construct a spatial weight matrix by employing the threshold method to measure the spatial connectivity among discrete spatial points. This method can save searching costs by building a searching area for each point when we set values for each element of the weight matrix, and achieve optimization in the process of constructing a spatial weight matrix. The...
Combining the character of landscape and the theory of Markov chain, this paper inferred the forecast model of fuzzy weight Markov chain. The new model which was called FWMC to predict the future value of cultivated land demand in land use planning. Factors to consider in driving conditions was used in this model, the real response to landscape pattern change position using a weighted Markov transfer...
Spatiotemporal data model(STDM)are gradually becomes hot spots currently. As an application of STDM, the organization of real state spatiotemporal data has been paid more and more attention. The paper analyze the dynamic change of real estate data, puts forward an effective solution by adding time field to be able; and also propose a method which solve the problem that the fields of relational data...
Digital globe is a visual system based on geographical coordinate, provided with multi-resolution, mass data and multi-dimensional display. Three-dimensional terrain visualization is an important composition of researches about terrain visualization technology and digital globe, also is the foundation of realizing the multi-angle, multi-layer, real-time generation, display analysis and roam of three-dimensional...
In the network application environment of ArcGIS, the spatial data and rendering data of map elements are stored separately. Spatial data is stored in the geographic spatial database, while rendering data is stored in file format. So, when displaying the same ArcGIS spatial data to the multi-clients, there will be problem of rendering inconsistency on spatial data. Through the analysis on rendering...
This article proposes an exploitation program of an GIS-based investment attraction management information system, with VB6.0 serving as its exploitation platform, Map X as its formation exploitation pattern. This system makes the designed function possible, basically meet with the requirement of the management of the investment attraction information. Applying GIS to “investment attraction” information...
The paper analyzes the concept, elements and data structure of the multi-mode transportation network, proposes a polycentric hierarchy description model of the integrated transportation network, and discusses the construction method of multi-mode transportation network using GIS technology. The design of system function modules provides a visual edition platform to realize the construction of integrated...
At present, in most RFID systems, data acquisition and system configuration of mobile readers are based on site collection and then synchronization of data and configuration information with server by manual work. Because of extensive application of RFID systems, it may become the critical system of consumer payment, identification and many other service applications. However, data synchronization...
To meet the requirement of real-time vehicle navigation, a new path planning algorithm based on partitioned urban transportation network is proposed in this paper. The foundation of the algorithm is that an actual road network has its particular spatial distribution features, and GIS has strong visual editing functions for transportation network. According to the size of the transportation network,...
Depending on the current fast-growing Web virtual reality technology, a Web three-dimensional virtual geographic laboratory based on real geographic laboratory is created by VRML. Interaction between the user and the scene is achieved through the integrated use of ASP and JavaScript technologies. Students can access anytime and anywhere to the virtual environment to interact with objects in the three-dimensional...
For addressing the problem the society has higher and higher demands of government constitution and management of mid-and-long term macro-planning. The five-year planning MIS research on medium-small city based on GIS are established based on Visual Basic6.0 and components of GIS software-MapX, making the management of general planning realize digitization, data indicator become standardization, results...
Today with rapid development of computer technology, people require placing data into large databases on the unified management. And a variety of data need the corresponding efficient boundary when they need to store. The standard framing data as one of the special kinds, that how to take a fast, accurate and effective storage has been always the focus of the study. This article starts from the naming...
In 3D GIS, in order to quickly and accurately build 3D models, polygons which are formed by 2D vector data should be triangulated. At present, in GIS, ear clipping triangulation algorithm is widely used in triangulating simple polygons. Because ear clipping triangulation algorithm is low efficiency, more easily to generate long, narrow triangles, a continuous cutting algorithm for triangulating a...
Ninety percents energy and more than eighty percents industrial raw materials came from mineral resources at present. In fact, the exploitation of mineral resource consumes two resources: mineral resources and environmental resources. Opencast mining of resources particularly leads to great damage on ecological environment. This paper selected Xiangning County of Shanxi Province as the study area...
Sugarcane production area is “the first workshop” for the sugar refinery, and it is very important to strengthen its farm management for enhancing the quality of sugarcane and increasing the sugar yields. This paper mainly introduces one way of building a comprehensive, efficient, three-dimensional farm management information service platform for sugarcane farmers, governments, and production management...
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