作者运用的材料涵盖了对本地资料的搜罗、实地的地形测量考察材料,以及传教士和旅行者搜集的间接见闻等诸多方面。作者评述的时间跨度也很大,初起于文艺复兴时期地图集里零星散见的、基于猜想的错误百出的地图,止于十七、十八世纪描述较为精准的地图『那时出现了两位从科学和哲学层面上解决这一问题的领军人物——卫匡国(Martino Martini)和杜赫德(Jean-Baptiste du Halde),两人同为耶稣会士』,呈现了这一背景下人们对天朝之国的描述。
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