计算机毕业设计方案外文翻译.doc
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1、学校代码: 10128学 号: 2076 本科毕业设计外文文件翻译(题 目:The Design and Implementation of 3D Electronic Map of Campus Based on WEBGIS学生姓名:张 天 佑学 院:信息工程学院系 别:计算机系专 业:计算机科学和技术班 级:计算机09-2指导老师:庄 旭 菲 讲师 贾 然 工程师二 一 三 年 六 月The Design and Implementation of 3D Electronic Map of Campus Based on WEBGISI. INTRODUCTIONNowadays, di
2、gitalization and informatization are the theme of our times. With the development of information revolution and computer science, computer technology has penetrated into all fields of science and caused many revolutionary changes in these subjects, the ancient cartography also cant escape. With the
3、technical and cultural constantly progress, the form and the content of the map change and update as well. As the computer graphics, geographic information systems (GIS) constantly applied to the Web, the conventional way of fabrication and demonstration has suffered great change, and the applicatio
4、n of the Map has extended dramatically owing to the development of advanced information technology. Under these circumstances, cartography will be faced with promising prospect. It has branched out into many new products. One of the products come into being is the e-map 1. With the rapid development
5、 of the computer technology, computer graphics theory, remote sensing technology, photogram metric technology and other related technology. Users require handling and analysis of three-dimension visualization, dynamic interactivity and show their various geo-related data, so much attention should be
6、 paid to the research of three dimensional maps. This article based on the Northeast Petroleum University and its surroundings designs and creates the three-dimensional electronic map. II. FUNCTIONDESIGNThree-dimensional electronic map system of campus based on WEBGIS has general characteristics of
7、the common maps. Through pressing the arrow keys (Up, Down, Left, And Right) on the keyboard, one can make the map move towards the corresponding direction of translation. Through dragging mouse, one can see wherever he likes. Using the mouse wheel, you can control a maps magnitude, according to the
8、 users needs to view different levels of map. The lower left of the map where will display the current coordinate of the mouse on the map. In a div layer, we depict a hotspot of new buildings, this layer can be displayed according to the different map layers, it also can automatically scale. By clic
9、king on hot spots, it can show the hot spots specific information. One can also type into the query information based on his need, and get some relevant information. In addition, one can choose to check the three dimensional maps and satellite maps through clicking the mouse. Major functions: User i
10、nformation management: Check the user name and password, set level certification depending on the permissions, allow users of different permissions to login the system via the Internet. The inquiry of Location information: System can provide users with fuzzy inquires and quick location. Map manageme
11、nt: Implement loading maps, map inquires, layer management, and other common operations such as distance measurement, and maps zoom, eagle eye, labels, printing, and more. Roam the map: Use the up and down keys to roam any area of the map, or drag-and-drop directly.III. THE PROCESS OF SYSTEM DEVELOP
12、MENTTo the first, we collect the information which contains the outward appearance of architectural buildings, the shape of the trees the design of the roads. And then, we construct three dimensional scenes with 3DS MAX software 2. That is to say we render the scene and achieve the high-defmition ma
13、p, after that we cut the map into small pictures with the cut figure program, at last we built the html pages which can asynchronous load maps and achieve the function of the electronic maps. The flow chart of the system development will be shown in Figure 1:Figure 1 system development flow chartTra
14、ditional maps have strict requirements on mathematical laws, map symbols and cartographic generalization when in design. The production of network landscape electronic map also has its own technical standards which is superior to the traditional map. The three-dimensional electronic map has differen
15、t zoom levels; therefore it needs not the strict scale but the unified production standards. Map symbol usually imitate the real world as much as possible and simplify itself at the same time. The scope of the screen is far greater than the fixed vision of papery maps. Cartographic generalizations t
16、hink much of the balance between the abstract model and the actual performance results.As for the data acquisition and management, such as the introduction and the information users obtained from the map are final results of data acquisition. In the beginning, we collect the needed data including th
17、e name, the address, the introduction and the digital photos of the buildings and prepare for the subsequent three-dimensional modeling. After collecting the data, we should pay attention to archival and backup the files in case of loss. In order to get the map, a good preparation of the design of t
18、he standard scene is necessary. We set the parameter of the underlay, lights, altitudes, render effects and so on, so as to ensure the final fruit of our effort will have a uniform effect. The spatial entitys performances usually show up as the form of spot, line and surface in the three-dimensional
19、 electronic map. Compared with vector graphics, the grid graphics have unparalleled advantages. The combination of the grid graphics and the WEBGISs background publishing technology can improve the response speed of system and save systems inputs. System achieves the interaction with the map with th
20、e JavaScript languages. Seeing that there lie differences in supporting the scripting languages on various browsers, testing all kinds of functions by different browsers is a crucial step.IV. KEY TECHNOLOGIESThe developments of three-dimensional electronic maps are inseparable with the development o
21、f related areas, and it learns research methods, techniques and tools from other areas. While the researches of other areas are directly applied to the development and construction of three - dimensional electronic map, and Computer graphics, 3-D GIS, Virtual Reality and Geographic Data Base, the mo
22、deling of virtual scene and so became the technical support of the three-dimensional electronic map system. The WEBGIS technology on which three-dimensional electronic map system of campus based is a standard Software technology which means without any commercial softwares support. During the develo
23、pment of the system we make use of the common available technology which includes the JavaScript technology, Ajax technology, XML technology, etc. Ajax is not a one fold technology, it is a mixture which mixes multiple technologies together, including the document object which used to display on the
24、 web and its hierarchical structure document object model DOM, and CSS that used to define the elements of style, and data exchange format XML or JSON, implementation and asynchronous server of XMLHttpRequest and client script language JavaScript 3. Ajax takes advantage of non-synchronous interactio
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