What are the geomantic explanations for the site selection of Qingshuiling?

According to China's traditional academic geomantic omen, the location of Qing Yongling Mausoleum is located in the south of Yun Qi, facing south, running through Shinto, with the sun as the center and the central axis unbiased. In other words, Qing Yongling built the main hall of Baoding in front of Long Mai Cave, where the wind and air were hidden. At the location of Baoding main hall, a straight passage with a length of about 1 km was built from the main cave to the south, which was called "Lu Shen". This sacred road is the central axis of the mausoleum and the sitting line of the mausoleum. Yun Qi Hall, the Enjoying Hall, is built at the northern end of the central axis, which means "in the middle, in the sun". Both Yun Qi Gate and Zhenghongmen are arranged in sequence facing south on the central axis, which not only has the function of arching the main hall layer by layer, but also has the important implication of highlighting the center and strengthening the imperial power. The temples and bedrooms in Yongling are symmetrical, echoing each other, with a balanced layout and distinct levels. The east and west halls of the mausoleum, the fruit room and dining room, the Zhaozu Monument Pavilion and Xingzu Monument Pavilion, the Ban Qi Room, the board rooms and the tea restaurant are all centered on the central axis, and the East Ma Xia Monument and the Ximaxia Monument are symmetrically arranged left and right, with a balanced layout, clear priorities, mutual echo, balance, stability, solemnity and completeness. The combination of longitude and latitude of the Qing Yongling Mausoleum is staggered, rising step by step, contrasting and setting off, and arranged vertically and horizontally from front to back. For example, the lower horse monument is vertical, the front palace gate is horizontal, the east-west wing is vertical, the fourth ancestor monument pavilion is horizontal, the fruit dining room is vertical, the departure door is horizontal, the east-west annex hall is vertical, and the departure hall is horizontal. Face up to the vertical and horizontal, alternating, warp and weft combination, flexible and changeable. This staggered arrangement of warp and weft gives people a vivid, fresh, flexible and profound feeling. The side-view mausoleum building is in the form of low-high-low-high from front to back, and it is wavy. This wave-like building contour line gradually rises with the terrain, and the situation is turbulent. Baocheng Baoding is behind Qiyun Temple, which is the underground palace where the bones of Emperor Feng 'an and Hou are located, and it is called "Hou Bedroom".