【正文】 您還可以輸入精確的查詢，找到相應(yīng)的建設(shè)，以了解它的確切名稱。拖動綠色方塊中的鷹眼地圖可以快速定位到您想要的位置。地圖分為五個縮放級別，用戶可以放大出來要查看更多的建筑物，也可以放大以檢查建筑細節(jié)。鼠標按下事件主要是用來記錄拖動的狀態(tài)以及目前的位置，當鼠標功能將捕獲的拖動完成狀態(tài)，然后使用地圖顯示功能加載地圖。這個系統(tǒng)主要顯示內(nèi)蒙古工業(yè)大學 本科畢業(yè)設(shè)計 外文文獻翻譯 14 地圖圖片，當您查看或拖動地圖，它就像一張完整的地圖圖片的當前窗口，但事實上的小圖片拼湊而成。 一層是用來作為一個窗口載體地圖 ，該層的大小是一樣大的地圖，我們通常看到的通過瀏覽器（以下簡稱為窗口層）。 基于 WebGIS 的校園三維電子地圖，是一個以東北石油大學為原型的電子地圖系統(tǒng)。正如其他腳本語言，JavaScript 是一種解釋型語言，它提供了一個方便的開發(fā)環(huán)境。該系統(tǒng)使 EXT 結(jié)合 JSP 實現(xiàn)的其頁面電子地圖功能。 四 ． 關(guān)鍵技術(shù) 三維電子地圖的發(fā)展與相關(guān)領(lǐng)域的發(fā)展分不開的，并且借鑒了 其他領(lǐng)域的的研究方法，技術(shù)和工具。收集的數(shù)據(jù)后，我們應(yīng)該注意存檔和備份文件， 以防丟失的文件。 圖 1 系統(tǒng)開發(fā)流程圖 傳統(tǒng)的地圖在設(shè)計時對數(shù)學規(guī)律、地圖符號和制圖綜合都有嚴格的要求。 主要功能包括： ? 用戶信息管理：檢查用戶名和密碼，根據(jù)權(quán)限設(shè)置級別的認證，允許不同權(quán)限的用戶通過互聯(lián)網(wǎng)登錄系統(tǒng)。通過按鍵盤上的箭頭鍵（上，下，左，右），可以使地圖向相應(yīng)的方向移動。隨著 技術(shù)和文化的不斷進步，地圖變化的形式和內(nèi)容也隨之更新。s waiting time both psychologically and physically. That is why it will be easier to be accepted by public. 內(nèi)蒙古工業(yè)大學 本科畢業(yè)設(shè)計 外文文獻翻譯 5 EXT is an excellent Ajax framework written in JavaScript。s needs to view different levels of map. The lower left of the map where will display the current coordinate 內(nèi)蒙古工業(yè)大學 本科畢業(yè)設(shè)計 外文文獻翻譯 2 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 spot39。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 Inter. ? 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 mon 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 draganddrop directly. III. 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 scenes with 3DS MAX software [2]. That is to say we render the scene and achieve the highdefmition 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: 內(nèi)蒙古工業(yè)大學 本科畢業(yè)設(shè)計 外文文獻翻譯 3 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 work landscape electronic map also has its own technical standards which is superior to the traditional map. The threedimensional electronic map has different zoom levels。 it has nothing to do with the backend technology and can be used to develop rich client applications with a gorgeous appearance. The system enables the EXT bined with JSP to achieve the other page functions of the electronic map. The system bines the EXT with the Prototype whose framework bears the burden of creating a rich client and a highly interactive Web application, which realizes the application of the rich client efficiently and manage the safety of the client in a safe way that could be controlled. JavaScript is the principle technology of the system during the design and the implementation process. It allows a variety of tasks which can be pleted solely on the client, and without the participation of the work and server which used to support the distributed puting and processing, and therefore reducing the invisible waste of resources. JavaScript allows neither the access to the local hard disk, nor the data to be saved to the server, let alone to modify and delete work documents. The single way to browse the Web information and realize dynamic interaction is through the browser, which can effectively guard against the dataloss, consequently the system reaches a high security coefficient. JavaScript can be used to customize the browser according to the diverse users, the more userfriendly the design of web pages is, the easier the method for the users to master. JavaScript technology means through the smallblock approach to realize the programming. Just as the other scripting languages, JavaScript is also an interpreted language。在計算機圖形學中，地理信息系統(tǒng)（ GIS）不斷應(yīng)用到 Web，制作