網際地理資訊系統之設計

Abstract

網際地理資訊系統(IGIS)將成為地理資訊系統推動的主要方向。現今網際 地理資訊系統可分為互動地圖(ImageMap)、共通閘道介面(CGI)及嵌入程 式(Embedded Program)三類。互動地圖式IGIS速度快，製作簡單，但無法 對地圖上的屬性資料作查詢與分析；共通閘道介面式IGIS容易與傳統GIS 結合，但系統效率不高；嵌入程式式IGIS具備彈性及動態功能，使得 Internet與GIS能更緊密的結合,但目前尚未成熟,各家做法不同,且難度較 高。本文主要探討如何架構一個高性能、高效率的IGIS，並針對地圖格式 、瀏覽器限制及系統效率等問題提出建議。最後將設計出之IGIS與一桌上 型地理資訊系統作比較，討論實際上的效果。 Internet geographic information system (IGIS) will be the main develop direction of geographic information system. There are three types of present internet GIS - image map, common gateway interface (CGI) and embedded program system. Image Map system has high performance and easy to build. But it can not query and analyze objects on the map. CGI system can easily link traditional GIS, but low performance. Embedded program system has flexible and dynamic function, make internet and GIS closer. But it has no standard and hardly to implement. This paper discusses how to design a high performance and high efficiency IGIS, and give some suggestion to map data model, browser restriction and system performance problem. Finally, we compare our system to one desktop GIS, and discuss the really effect.