地理資訊系統朝網路服務發展已是近年不可遏止之趨勢，隨服務導向架構之興起，組合各網路元件，完成特定任務已非難事。在開放式地理流通環境中，地理資料及空間操作近年亦朝向透過公開介面供應服務之方向發展，如何正確運用網際網路環境中各式地理網路服務，有效串連可取得資源，以開創新興服務，將成為未來發展之重要課題，尤其在國家空間資料基礎建設之分散環境中，空間資源之有效應用勢必引入新的思維。
首先歸類跨領域之高共通性服務為基礎地理網路服務（Primitive Geospatial Web Service），並討論其發展機制，以滿足各領域之共通需求，達到重複使用（reuse）之效益。接著以開放網路服務鏈結架構，促進中介軟體發展與應用之策略，其中服務鏈架構納入基礎操作知識、領域知識以及任務之執行流程的概念，將可正確掌握服務內容，並確保服務鏈之運作品質。往後於空間資料基礎建設引入中介軟體與服務鏈，並規劃核心服務—基礎地理網路服務，將可達成一互操作、高度共享的地理流通環境，本研究以「土地使用分區證明核發」與「高捷轉乘資訊規劃」為例，驗證服務鏈發展與運作之實效，藉實驗成果顯示研究機制對於國家級空間資料基礎建設之資源應用與決策品質將有顯著之成效。
本研究之架構允許彈性地鏈結現有服務而發展新的服務，並藉網路服務環境鬆散耦合之特性，快速地組合特定應用之地理網路服務鏈，可創造服務鏈抑或結合服務鏈於中介軟體，以低成本進行異質資料之加值應用，解除當前不易於分散式異質環境整合龐大地理資源之窘境。

Over the past few years, GIS application platforms have evolved from traditional stand-alone systems toward distributed architecture of Web Services. Internaional GIS standards proposed by the ISO/TC211 and OGC provided a solid open framework for data and service to improve the interoperability among heterogeneous geospatial resource. By taking advantages of the independent, self-described and loosely coupled nature of web service, future Web-based GISs are expected to dynamically assemble various distributed web services to fulfill their application needs. However, to successfully and effectively introduce service chaining concept into the new GIS application paradigm and consequently achieve the ultimiate goal of a Service-Oriented Architecture in the Spatial Data Infrastructure still requires a thorough examination on the developing strategies and mechanism.
From a NSDI perspective, the challenge ahead is to transform the passive service-provided-as-it-is approach to an active and integrted application development approach. A basic framework for integrating service chaining concept and middleware application environment is proposed in this research. We argued that a NSDI should develop its own set of primitive geospatial web services, which must be capabale of meeting the demands of highly-demanded geospatial data and operation, and therefore reduce duplicated investment and increase the resuablity of existing geospatial web service. Three categories of primitive geospatial web services are investigated and analyzed in this research. The proposed framework also includes a middleware application environment based on open and interoperable geospatial web service. Built upon common and application-dependent GIS knowledge, the proposed middleware is capable of chaining existing web service to develop new GIS applications. Two examples are chosen in this research to demonstrate the interacting chaining relationship between the middleware and distributed geospatial web service. As the number of geospatial resource steadily increases, the proposed middleware approach can flexibly support new application development with “open” and “interoperable” geospatial web service in the NSDI environment, therefore can be used to successfully resolve the obstacles caused by the heterogenity of distributed geospatial resources.

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