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在一般地方简易公路上,测量较小半径曲线时,多习惯于用切线支距法。此法较简而易行,也可达到一定的准确度。但一般切线支距表中,仅列出X为正公尺数,和与之相应的y值(如,2,4,6,8,10及5,10,15,20……X值及相应的y值)。在地形平坦或坡度变化均匀处,是可以满足测量人的要求的,而在地形起伏变化不均匀处,这些起伏点正是需要测设纵横断面点,以利正确计算土方数量。但是这些测点,不一定恰巧在表中能查到X和相应的y值。这样就需要进行复杂的计算,往往形成一人计算数人停工等待,影响整个工作的进度。在此种情况下,计算者多是争取时间很快算完,因而容易产生错误。个人
In general local simple road, the measurement of smaller radius curve, more accustomed to using the tangent offset method. This method is simple and easy, but also can reach a certain degree of accuracy. However, in the general tangent offset table, only X is the number of positive meters and the corresponding y values (eg, 2,4,6,8,10 and 5,10,15,20 ... X values and The corresponding y value). When the terrain is flat or the gradient changes evenly, it is able to meet the requirements of the surveying people. However, in the uneven variation of the terrain, the vertical and horizontal cross-section points need to be measured to facilitate the correct calculation of the amount of earthwork. However, these measuring points do not necessarily happen to be able to find X and corresponding Y values in the table. This will require complicated calculations, often forming one person counting the number of people waiting to stop working, affecting the progress of the entire work. In this case, the calculators are often fighting for time to finish, which is prone to error. personal