Regulations on the use of altitude
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In the process of engineering design, a relative elevation is generally defined for the installation location of equipment in the device. In the unified regulations of the project, the altitude of the project location is usually specified, and the altitude is also based on the altitude of a certain place. In the projects I have been involved in, the altitude standard of a certain place is mean sea level. ； It is also based on Wusong sea level (Wusongkou sea level, but the project location is not in Shanghai). Question now: 1. Is the mean sea level measurement point where the project is located, or is it the average data of various measurement points across the country? 2. Is Wusong Sea Level used as a reference point in other places, such as Zhejiang, Anhui, Fujian and other places? The question is very confusing, but the lines are very confusing. Please ask an expert to clarify my doubts. Thank you very much!
The elevation water level includes Wusong elevation and Yellow Sea elevation. The two elevations take different base levels.* * The Yellow Sea datum is uniformly used, while the Wusong datum is used for the Yangtze River system. The lowest tide level at the Wusong tide gauge station at the Huangpu River Estuary in Shanghai from 1871 to 1900 is the zero point of the water gauge. Vertical elevation All buildings and structures must have absolute elevation and relative elevation positioning. In engineering projects, the plane elevation of the first floor of a building is generally set as the positive and negative zero points, and the vertical height compared with it is called the relative vertical elevation. elevation: The vertical distance from the measurement point to the elevation datum. It is a number, both positive and negative. The common reference point in engineering is the Yellow Sea elevation as 0 point. Yellow Sea elevation: 1985 * * The elevation datum is the level origin elevation determined by the average sea level calculated based on the tide gauge data of Qingdao Tide Gauge Station from 1952 to 1979. It was established by the Qingdao Tide Gauge Station in 1987. * * The Bureau of Surveying and Mapping promulgated it as my country's unified measurement elevation benchmark. Wusong elevation: Yangtze River system * The commonly used elevation system is still used because it is troublesome to unify it with the Yellow Sea elevation, which is about 1.8 meters higher than the Yellow Sea elevation. Usually, we set +-0.000 on the indoor floor, the outdoor elevation is -0.45, -0.3, and the bathroom is -0.03. If the indoor floor has several differences, it is difficult to tell. Without looking at the picture and relying on experience, problems may arise.