本文旨在提出遝用語意資料模式建立地理資訊系統的新方法。這方法包括兩個步驟：（1)地理資 訊系統的架構層以語意資料棋式皮立；（2)相對應的實體層則以已商業化的關聯模式建立。故本文亦 提出語意資料模式與關聯式資料模式的轉譯器。本文所提方法的優點包括.：（1)語意資料模式對資料 庫架構層所提供的摘要說明能力比關聯式資料模式強，故實體資料獨立的觀念更加強化：（2)棋式轉 譯器提供資料庠設計自動化的工具；（3)地理資詋系統的實體層採用間聯式資料模式以配合目前正實 際運作中的系統可持續使用。

This paper proposes a new technique to setup a geographical information system (GIS) using the Semantic Data Model (SDM). The proposed technique consists of the following two steps. First, a GIS is constructed by the semantic data model at the conceptual level; Second, the physical level of the GIS is planted on a commercialized database system of relational data model (RDM). A model translator from SDM to RDM is also designed in this paper. The advantages of the proposed technique are: (1) the semantic data model provides more data abstraction primitives for the conceptual structure of a GIS than are provided by the relational data model; the concept of physical data independence can be enhanced; (2) the proposed model translator provides a valuable software tool for database designer since the problem of model transformation between the SDM and the RDM is solved automatically; (3) the physical layer of GIS using relational data model will accommodate the existing fact that the current operating GIS has to be in use continually.