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主題說明
MHGIS鐵路專題，在空間上的範圍限縮為「曾為大清領土」的區域，圖資時間始於1865年大清領土出現第一條鐵路，止於1970年。另外，考慮到中國鐵路建設多有外國勢力參與的特點，滇越鐵路等與中國境內路線直接相連的外地路線也一併列入，避免同一系統的鐵路遭國界分割。鐵路圖資的參考資料來源，包括路線圖、地形圖及當代地圖。有確切路線圖可用者，依據路線圖參照當代地圖繪製；沒有確切路線圖可用者，則依據早期地形圖參照當代地圖繪製。除了向量圖資外，另外有各鐵路路線的簡介。由於鐵路站點的增減相當頻繁，目前的資料只能反映特定時期，尚不能呈現出站點增減的全貌。
Description of the Topic
The MHGIS railway project is spatially limited to the area that was "once the territory of the Qing Dynasty", and the first railway in the territory of the Qing Dynasty started in 1865 and ended in 1970. In addition, taking into account the fact that most of the railway construction in China involved the participation of foreign powers, the Yunnan-Vietnam Railway and other foreign lines directly connected to the routes in China are also included to avoid the division of the same system of railways by national borders. Reference sources for rail maps include route maps, topographic maps, and contemporary maps. Where precise route maps were available, they were drawn from route maps with reference to contemporary maps; where precise route maps were not available, they were drawn from early topographic maps with reference to contemporary maps.
In addition to the vector map information, there is a brief description of each rail line. Since rail stations were added and removed frequently, the present data could only reflect certain periods and could not display the full picture of the additions and deletions of stations.
操作說明
1. 檢索功能：在頁面左側功能列的搜尋框輸入關鍵字，即可檢索本主題/地區的地圖、地標、道路等資訊。若要搜尋MHGIS全部資料，請使用頁面正上方的搜尋框。
2. 地圖：每個主題/地區除了基本底圖外，再根據各地區特色，加上定位的地形圖、行政區域、商號資料、交通路線等圖層。各圖層可自由疊加，設定透明度，方便進行比對。
3. 地標、道路等圖資，是從地圖直接擷取或整理相關史料所得，資料來源加註在各地標資訊視窗中。
4. 測繪數化：提供使用者在圖層上直接標註地點或繪製圈選區域，數化後的資料可以匯出geojson檔案，以便在GIS應用程式使用；或可選擇「匯出圖片」，直接擷取網站頁面影像。
Operating Instructions
1. Search function: Enter the key terms in the search box on the left side of the page to search for maps, landmarks, roads and other information of this topic/area. Search all MHGIS information, please use the search box at the top of the page.
2. Map: In addition to the basic base map, each topic/area is also covered with topographic maps, administrative areas, business information, transportation routes and other layers according to the characteristics of each area. Users can freely adjust transparency and superimpose each layer for easier comparison between different maps.
3. Landmarks and roads are directly retrieved or compiled the maps from related historical materials, and the MHDB team annotated the sources in the information window.
4. Vectorization: The service provides users to directly mark locations or draw circled areas on the map layer, the digitized sources can be exported to geojson format for using in GIS applications. Users can either choose "export PNG" to directly capture images of web pages.
