To conclude the massive task of the Complete Charts, the emperor, in the 53rd year of his reign, assigned three French missionaries skilled in cartographic surveying, plus a large team of assistants, to map Taiwan, by then fully under Chinese sovereignty.
「聖祖實錄」的上諭中曾有「朕於地理，從幼留心」的記載，他為了完成規模宏大的皇輿全覽圖，於康熙五十三年派了三名懂得地圖測量技術的法國傳教士﹘﹘雷孝思、馮秉正、德瑪諾，率領大批人員到已列入中國版圖的台灣測繪地圖。