In the six theoretical contents of traditional geomantic omen, namely, "seeking dragons, selecting points, examining sand, finding water, setting directions and choosing dates", it has an unquestionable "core" position. It is still very effective to find dragons on high-altitude maps, at least we can have a preliminary judgment, which saves a lot of suffering from travelling across mountains and rivers. The details are still subject to the on-site investigation, and the high-altitude map is adopted by the Feng Shui master as an aid.