官方版電子地圖空間資料完整性檢核案例研究

A CASE STUDY OF AUTOMATING EXAMINATION FOR SPATIAL DATA COMPLETENESS OF DIGITAL STREET MAPS

林威延(Will Y. Lin) ； 林保宏(Pao H. Lin)

《中國土木水利工程學刊》 29卷4期 (2017/12) Pp. 277-284

https://doi.org/10.6652/JoCICHE.201712_29(4).0007

摘要

電子地圖資料完整性(Data Completeness)係指「道路圖資涵蓋實際道路的程度」，是電子地圖首要的品質指標之一。台灣官方過去獨立發行的兩套電子地圖都是以抽驗方式檢核其資料完整性，此法雖具有統計的信效度，但無法確保並積極提升圖資的完整性。本文彙報作者於103年協助交通部進行路網路值圖檢核時所研擬的資料完整性檢核流程，利用內政部同期發行的通用版電子地圖，比對路網路值圖數化範圍內的所有道路，並推估資料完整性的真實值。結果顯示，本檢核流程可以相對精減的人力達到普測的效果；若修正檢出的短少及超出路段，資料完整性亦可獲致顯著的提升。

關鍵字

電子地圖、空間資料品質、地圖匹配

並列摘要

Data completeness of digital maps, referring to the degree of road data covering the reality, is one of essential data quality indexes. Examining the data completeness of two governmental digital maps in Taiwan had been conducted by sampling methods, which is not able to thoroughly ensure and improve a digital map’s data quality. This paper summarized a lesson learned from performing an examination task by the author for an official digital map of Ministry of Transportation and Communication, Taiwan in 2014. Using another official map data issued by the Ministry of Interior, Taiwan as the benchmark, a workflow of examination was proposed that can quantitatively determine the data completeness of a digital map by thoroughly contrasting the geometric data of the two digital maps. The workflow effectively reduced the cost of manual work; meanwhile, the data completeness can also be significantly improved by correcting the omission and commission data identified by the process.

並列關鍵字

digital maps ； spatial data quality ； map matching