Reduced Level Reduced level is the vertical difference between the level point and datum line or the mean sea level. Benchmark Benchmark is the point laid above or below the datum line with a known elevation. Bench mark is considered as check for the other level points. There are different types of bench marks are available in the surveying as.. A 'level' is a spot on the building site where a height is taken to determine the slope of the land and its steepness. The image below is a Land Surveyors drawing of a building site. (click image for larger view) The levels on the site plan are the numbers next to the crosses on the site plan. They look like this:
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Reduced level of the line of sight, RL= 0 + h1 =h1 Reduced level of the point B = h1-h2. With a levelling instrument, it is possible to establish only a horizontal line not a level line. However,for the smalldistances involved in ordinary levelling, the distinction between level line and horizontal line is negligible.. Level Surface in Surveying. Level surface is the continuous surface parallel to the mean spheroid of the earth. The line representing the level surface is termed as level line. The level line makes right angles to the vertical line or plumb line at any point. It means the any point on level line is equidistance from the center of earth.
