《日治時期臺遵二萬五千分之一地形圖>> '是日治後期(自1920年代至終戰前)的公 務用圖，自1998年遠流出版社復刻出版後，該套地形圖在臺灣學界廣為使用，重要性 無需贅言。然而本套圖測繪跨越時間長、版本復雜，尤其每張圖都同時並用「自然序數 法」和「上位圖名法」兩種圖號(前者如「新竹近傍一號」或「基隆要塞近傍一號J ' 後者如「臺北十四號大圓J 四J ) ，前者的圖號還多次因增繪和要塞地帶改編軍事秘圖 等因素而改變。關於本套圓圓號的變遷，清水靖夫與施添福等前輩都做過先導研究，然 或當年圖翼取得較為不易，難以取得同圖幅的各種版本， 導致這方面的研究成果不夠完 善， 並未釐清真實的變遷狀況。筆者藉當今地形圖數位典藏之發達，取得本套圖的數量 達千餘帽，深覺要釐清本主圓圓號的變遷，係與要塞地帶範圍的幾次調整有必然的因果 關係。因此本研究就從大量圖資彙整入手，首先推導出本套圖雙重圖號之真實變遷狀 況，進而探討圖號變遷與要塞地帶範圓調整的關係， 再以本套圖和同期同單位製作的 《五萬分之一地形圖》比對要塞地帶範圍調整的一致性和差異性。最後以本套圖圖號系 統的研究成果，與臺灣主要藏圖機構的編目整理參照分析，提出改進建言， 以利將來研 究者之所需。

The 1:25,000 topographical maps of Taiwan were official maps, which were made in the late period of Japanese rule (since the 1920s to the end of the World War II), and widely used in Taiwan academic circles after its reprint by the Yuan- Liou Publishing Company in 1998. However, it took a long time for surveying and mapping, and had very complex editions, especially each map had two map sheet numbers with “Natural numbers method” and “Smaller scale's sheet name method” at the same time (the former as” Sheet 1 of Hsinchu area” or “Sheet 1 of Keelung fortified area”, the latter such as “Taipei-14[Dayuan]-IV "). The former map numbers were also changed many times because of the increased restricted zone of fortified area. As to the changes of the map sheet numbers, Shimizu Yasuo and Shih Tien-fu and other predecessors had done some pilot study, but in the past it was difficult to get entire maps like the same sheet with various editions, so the former research was not perfect enough and the real changes had not been clarified. Relying on the developed digital collections of topographic maps nowadays, the author had obtained thousands of sheets of 1:25,000 topographical maps of Taiwan, and realized that the changes of the map sheet numbers had inevitable causal relationship with several adjustments of the fortified area. This article starts from a large number of map data, firstly derives the real changes of the double map sheet numbers, and then discusses the relations between the map sheet numbers changes and the fortified area adjustments, next compares with the “1:50,000 topographical maps” made by the same institution in the same period to find out the consistence and difference of the fortified area adjustments. Finally, using the research results to make a contrastive analysis of the cataloging of Taiwan's main map collecting institutions and put forward some improvement suggestions to benefit the future researchers.