GIS 導 航 路 徑 簡 化 圖 示 在 無 線 通 訊 端 應 用 之 研 究

Abstract

網際網路地理資訊系統在導航路徑的應用的技術已逐漸成熟，隨著無線通訊的發展，GIS導航配合行動通訊設備，成為各通訊產業的主要研究發展方向，但目前無線通訊頻寬受限，行動用戶端設備的圖形處理和螢幕顯示能力也無法和個人電腦相比，因此要將GIS資訊應用於無線通訊資訊量處理及傳輸能力的問題。 GIS導航路徑簡化，其主要目的就是在把GIS伺服器所產生的導航路徑之資訊做簡化，透過無線雙向資訊交換，傳遞簡要的GIS導航資訊至用戶通訊端上。透過簡圖方式或文字敘述方式呈現，不僅可適用於現行的通訊系統，並且也可讓使用者迅速了解路徑，使用者不必花費高功能的導航系統配備，就可以達到個人導航的目的。本文就導航路徑圖形簡化與導航路徑文字敘述轉換過程進行研究。將繁雜的地理資訊系統資料庫做初步的規劃與簡化後應用於無線通訊傳輸及行動通訊用戶端，以J2ME發展展圖程式雛形顯示在PDA上，以空間幾何推演文字導引路徑的機制。採用此種簡化之構想，以利GIS導航路徑在互動式無線通訊端之建立，導引路徑之運算及傳輸時間約可比一般傳輸方式大幅縮減，對GIS路徑導引在無線通訊上之應用有極大之幫助。

The technology of Web Based Geographical Information System(Web-GIS) has been developed in route navigation of mobile users. With the advance of wireless telecommunication, GIS navigation with mobile telecommunication devices has become a hot subject of research for wireless service providers. But restricted by bandwidth of wireless telecommunication, the performance of graphic process and screen display capabilities in the mobile client ends can’t meet the standard of the personal computer. Therefore, the critical problem of GIS information application in wireless telecommunication is how to reduce the amount of information flow in the transmission phase. The main purpose of this study is to illustrate that a navigation route resulted from GIS server can be simplified then transmitted in a schematic form to the client by wireless two-way exchange. By the schematic representation and text guide of navigation route being displayed in the screen, and users can quickly find out the route in a short respond time. The thesis studies the transformation process of the navigation route from the GIS database into a simplified schematic form and also the navigation information to a short message text. For this purpose, the complicated GIS database are re-organized and simplified, then a graphic program with J2ME is developed for the application in the PDA. With this idea, the required to transmit a navigation route information can be quickly reduced.