| 研究生: |
陳松靖 Chen, Song-Jing |
|---|---|
| 論文名稱: |
以XML整合空間資料及詮釋資料之研究 The Integration of Spatial Data & Metadata based on XML |
| 指導教授: |
洪榮宏
Hong, Jung-Hong |
| 學位類別: |
碩士 Master |
| 系所名稱: |
工學院 - 測量工程學系 Department of Surveying Engineering |
| 論文出版年: | 2003 |
| 畢業學年度: | 91 |
| 語文別: | 中文 |
| 論文頁數: | 186 |
| 中文關鍵詞: | 延伸式標籤語言 、詮釋資料 、地理標籤語言 |
| 外文關鍵詞: | GML(Geography Markup Language), Metadata, XML(eXtensible Markup Language) |
| 相關次數: | 點閱:126 下載:4 |
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地理資料之整合應用必須建立於不同資料的互通性及對各資料現況的了解掌握。各商業軟體往往因資料格式不同,使得資料無法共享及再利用,也間接提高資料的成本。OGC協會為解決資料共享及互通性等問題,定義了GML語言來記錄空間實體的空間位置及相對應屬性資料,以XML語言自訂標籤、文字式描述等優勢來促成資料格式的透明化及共享化。針對資料了解而言,行之多年的詮釋資料標準目前也傾向以XML語言來記錄。基於這兩種資料都以XML語言來記錄,且資料應用時必須同時引用兩者,本研究研擬如何於XML基礎下統合兩者資訊,以設計可輔助推動資料互作用性的地理資料流通及應用機制。地理資料之流通將可以用網際網路標準的XML來完成,改善目前受限於各家資料格式不同之狀態。
本研究將流通方式分為:(1)詮釋資料、實體資料合一及(2)詮釋資料、實體資料分開兩種方式。在第一種方式中,一個XML檔案將包含詮釋資料、空間及屬性資料,傳輸資料的效率及完整性較高;第二種方式則維持兩種資料分在兩個XML檔案中,並透過連接機制相關聯,較接近資料之原始狀態。由測試成果反映出,此兩種方式確實可執行XML資料結合、地理資料的展現及結合資料之驗證等工作。利用結合的資料將有助於判斷地理資料的比例尺、建置時間及資料格式等因素,對於地理資料的採用將可以減少錯誤率及提高資料後續分析的正確率、可靠度。
研究中分別發展XML Parser模組及XMLGIS展示模組,以輔助地理流通機制的執行。整體地理流通機制利用GML語言及詮釋資料的優勢,將其資料合併作為地理資料的共通傳輸格式,其均可用XML表示。對於地理資料互通性、分享性及可讀性之未來研究帶來正面之成效。
The success of an integrated GIS environment must be based on the interoperability and understanding of the geographic data involved. Various commercial GIS vendors have proposed their own data formats, which unfortunately often impede the sharing of geographic data as well as increases data reuse cost. To provide a better solution to the data sharing and interoperability issue, OGC proposed Geography Markup Language to record the location and corresponding attribute information of spatial entities. With its XML nature, GML take such advantages as self-defined tag and ASCII-based encoding to remove obstacles caused by the difference of data format. In the meantime, most of the current metadata standards also choose XML as their recording format. Since we must consider both geographic data and its metadata in our applications and these two data now tends to be recorded in XML, our intention in this thesis is therefore to propose a data distribution strategy purely based on XML. Such a proposal has a potential to improve current data format bottlenecks by using a simpler and consistent tools based on Internet standards.
Based on how data is distributed, two scenarios are identified and investigated in this thesis: combination approach and separation approach. The combination approach combines related GML and metadata file into a single XML document before providing to users. On the other hand, the separation approach maintains these two types of data in two individual XML files by introducing inter-connected mechanism during distribution process. The combination approach has better data integrity and transmission efficiency, while the separation approach is closer to the original data status. The experiments show that both approaches can effectively and successfully distribute geographic data in XML format and correctly provide auxiliary information on scale, time and data format to avoid mistakes and improve reliability of decision making during the data integration process.
We developed two modules, XML Parser module and XMLGIS module, respectively to aid the execution of geographic data distribution. By taking advantage of the fact that geographic data and metadata can both be represented by XML, these two types of data are combined together to a common data transfer format. The proposed process can therefore bring positive impacts on the future research of interoperability, sharing, and readability of geographic data.
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