Hsia explains that it is a method that works well for a bird's-eye view of Taiwan's western seaboard, lowlands in the foreground against a backdrop of mountains to the east. It also matches the perspective of Ching rulers in the heartlands of China, for whom Taiwan was a distant fringe.
根據夏黎明的研判，此種繪法有利於俯視東高西低的台灣西半部地勢，而且符合統治者自大陸中原透視台灣邊區的心理。