地面上两点间的高差,也就是地面点的高程是反映地面起伏状态的基本要素,也是工程设计和施工所依据的基本资料,因此在大地测量、国防施工、农田水利、房屋修建、铁路建设、公路桥梁等国民经济建设的各方面都离不开水准测量。在林业建设方面,林区公路、贮木场站测设和施工,水准测量的任务就是利用水准仪测定各点间的高差,用已知点的高程推算各点 The elevation difference between two points on the ground, that is, the elevation of the ground point, is the basic element that reflects the state of ground fluctuations, and is also the basic data on which the engineering design and construction are based. Therefore, the geodetic survey, national defense construction, farmland irrigation, house construction, and railway All aspects of national economic construction such as construction, highways and bridges can not be separated from the standard measurement. In terms of forestry construction, the surveying and construction of roads and stockyards in forest areas is the task of level measurement. The level difference between points is measured using a level meter, and the elevations of known points are used to calculate the points.