While he was surveying the route, Cheng collected all the maps he could find from the Qing, Japanese, and Republic of China eras in Taiwan's history. But the maps 'lack of clarity left Cheng pulling out his hair in frustration.
在探勘古道期間，鄭安晞蒐集了所有清代、日據到國民政府時代的地圖，標示不清的結果卻讓找路的鄭安晞吃盡苦頭。