本工具提供使用者於地圖上觀察THDL古契書所在位置及分布情形。使用者除可以關鍵字詞，契書種類及契書地點進行檢索外，亦可透過多邊形檢索功能自行框取範圍，並搭配時間軸呈現檢索結果。可供選擇的歷史地圖資料包括1904年臺灣堡圖、地形圖、衛星地圖，以及古今對照。

This tool allows the users to observe the geographic location and distribution of land deeds in the “Taiwan Governors Archive for Transcribed Contract Documents” subcollection of THDL. A user can search by keywords, contract types or location. A novel method allowing the user to draw a polygon to retrieve all the land deeds within is also provided. A timeline feature for refining the query result set according to time is also included. The available historical maps include 1994 Taiwan Township maps, topographical maps, satellite maps, and ancient and modern map comparison.