| 研究生: |
蔡雯怡 Tasi, Wern-Yir |
|---|---|
| 論文名稱: |
組織間網際網路地理資料流通共享之研究 An Inter-Organization Geographic Data Distribution and Sharing via Internet |
| 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: | 2002 |
| 畢業學年度: | 90 |
| 語文別: | 中文 |
| 論文頁數: | 111 |
| 中文關鍵詞: | 共享 、地理資料 、網際網路 、組織 |
| 外文關鍵詞: | Internet, Geographic data, Organization, sharing |
| 相關次數: | 點閱:58 下載:1 |
| 分享至: |
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地理資料之數量在過去十年內持續穩定地增加,同時,各領域對於地理資料之建置及管理的專業知識需求也日益增加,造成目前有許多獨立的地理資料庫遍佈於各地。相關組織間的資料共享,不僅能改善他們的整合應用能力,而且亦能在參與的組織間促進一個較為緊密之合作關係。在本研究中,我們將僅著重在組織間的資料共享環境設計。組織間的資料流通具有如相關資料之共識性、較容易之標準化作業、以及較高之軟體相容性等典型之優點,共享對每個參與者將可能帶來莫大的助益。
設計之機制涉及來自於每一個組織之詮釋資料和實體資料庫。依據組織間之權責性和資料分散技術之可能情況,可將詮釋資料及相關之實體資料庫儲存於集中式之資料庫或分散式之環境。在本研究中,將專門探討兩種情況:(1)詮釋資料集中、實體資料集中,(2)詮釋資料集中、實體資料分散。在第一種情況中,就資料傳送而言,整個流通機制將由單一組織所擁有及管理。在第二種情況中,則由一主要單位組織負責管理詮釋資料,而實體資料則由其各自之組織維護。兩種系統架構均包含一個集中式的查詢伺服器,以執行給定之約制條件、搜尋可獲得之詮釋資料,並當有需要時取回其相關之實體資料。這樣的策略可以減低作業負擔以及增加效率。最後再以此兩種系統架構之測試成果來評估一個組織間資料共享之較佳策略。
測試成果指出,此兩種系統架構皆是確實可行的。在組織間的環境中,若一組織擁有大多數的資料於其儲存裝置上,而其餘之組織僅擁有一小部份之資料,則較適合第一種系統架構,因其具有硬體/軟體花費較低及搜尋效率較高之優點。然而若是每一個組織擁有的資料量差異不大,或是每一個組織各自獨立運作沒有彼此介入之關係時,則第二種系統架構是較佳之選擇,因其具有分散式處理及分擔負載之優點。
The accumulated volume of geographic data has been steadily increasing in the last ten years. In the mean time, the demands on the professional knowledge for creating and managing domain geographic data also increases, consequently there are now many independent geographic databases all around the world. The sharing of data among related organizations can not only improve their integrated application capability, but also promote a closer cooperative relationship among participating organizations. Our major interest in this research will only focus on the design of an inter-organization data-sharing environment. With typical advantages like common interests on related data, easier standardization and higher software compatibility, the data distribution among organizations may prove to be very beneficial to every participants.
The mechanism would involve both the metadata and physical database from each organization. Depending on the possible scenario among organization’s authorities and data distribution technique, the metadata and related physical databases can be either stored in a centralized database or a distributed environment. Two scenarios will be specifically investigated in this research: (1) centralized metadata and physical database and (2) centralized metadata database and distributed physical database environment. In the first case, the whole distributed mechanism is owned and managed by a single organization, as far as the data transfer is concerned. In the later case, a primary organization is in charge of the management of metadata, while the physical database is maintained by its respective organization. Both system architectures include a centralized query server to search available metadata fulfilling given constraints, and later retrieve associated physical data when necessary. Such a strategy allows a reduction on work loading as well as an increase on efficiency. The test result of the two system architectures is then used to evaluate a better inter-organization data sharing solution.
The test result indicates both system architectures are feasible. In the inter-organization environment, if an organization holds the majority of data in its repository and the remaining organizations only possess a small portion of data, then the first system architecture is preferred with its advantage of less spending on hardware/software and higher search efficiency. Nonetheless, if there is not much difference on the data volume each organization possess or each organization acts independently without intervening relationship, then the second system architecture is a better choice with its advantages of distributed processing and load sharing.
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