The design and implementation of 3D electronic map of campus based on WEBGIS
Abstract: The three-dimensional electronic map of campus based on WEBGIS, is an electronic map system which takes the Northeast Petroleum University as the prototype. It can implement web publishing and spread the campus culture via the Internet. Moreover, it can provide conveniences for the users roaming campus by means of the system. Equally important, it has certain practical significance to the users. This article describes the development processes and various functions of the three-dimensional electronic map in detail.
Keywords: Digital Campus；JavaScript；Three-dimensional Electronic Map；WEBGIS
- INTRODUCTION
Nowadays, digitalization 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 can#39;t escape. With the 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 application 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 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 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.
- FUNCTION DESIGN
Three-dimensional electronic map system of campus based on WEBGIS has general characteristics of 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 map#39;s magnitude, according to the user#39;s 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 clicking on hot spots, it can show the hot spot#39;s 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 information 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 management: 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.
- THE PROCESS OF SYSTEM DEVELOPMENT
To 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 scene with 3DS MAX software. That is to say we render the scene and achieve the high-defmition map, 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 chart
Traditional 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 different 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 think 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 the 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 the standard scene is necessary. We set the parameter of the underlay, lights, altitudes, render effects and so
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The design and implementation of 3D electronic map of campus based on WEBGIS
Abstract: The three-dimensional electronic map of campus based on WEBGIS, is an electronic map system which takes the Northeast Petroleum University as the prototype. It can implement web publishing and spread the campus culture via the Internet. Moreover, it can provide conveniences for the users roaming campus by means of the system. Equally important, it has certain practical significance to the users. This article describes the development processes and various functions of the three-dimensional electronic map in detail.
Keywords: Digital Campus；JavaScript；Three-dimensional Electronic Map；WEBGIS
- INTRODUCTION
Nowadays, digitalization 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 can#39;t escape. With the 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 application 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 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 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.
- FUNCTION DESIGN
Three-dimensional electronic map system of campus based on WEBGIS has general characteristics of 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 map#39;s magnitude, according to the user#39;s 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 clicking on hot spots, it can show the hot spot#39;s 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 information 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 management: 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.
- THE PROCESS OF SYSTEM DEVELOPMENT
To 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 scene with 3DS MAX software. That is to say we render the scene and achieve the high-defmition map, 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 chart
Traditional 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 different 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 think 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 the 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 the standard scene is necessary. We set the parameter of the underlay, lights, altitudes, render effects and so
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