《明史·志·卷四十八》
所有天下地理险峻平易远近，边防内地疆域地界，都有地图集，每三年上报一次，与官军车马的数目一并上报。
凡天下地里险易远近，边腹疆界，俱有图本，三岁一报，与官军车骑之数偕上。
Maps are drawn of terrain throughout the empire, showing the ruggedness or ease of access to mountains and passes, the location of passes, local boundaries and terrain, and the boundaries between military regions and internal administrative regions. These maps are submitted every three years, together with detailed accounts of the number of troops and vehicles under the administration of each military jurisdiction.