What is a profile in surveying?
Profile leveling: is the process of determining the elevations of a series of points at measured intervals along a line. A profile survey is extremely useful for locating drains, roads, dams, and other earth structures. Each foresight is subtracted from the first height of the instrument until the instrument is moved.
Why profile levelling is done?
The profile levelling is done to determine the undulations of the ground surface. The ground profiles are used for the study of the relationship between the existing ground levels and the levels of the proposed route.
How is profile leveling calculated?
Figure 5.11 Profile leveling. Elevation computation: Elevation of line of sight (LS) = EBM + BS. Elevation of any intermediate point = ELS – FS.
What is profile leveling in surveying?
Profile levelling is the process of levelling along a fixed line to determine the elevations of the ground surface along the line. Profile levelling is also known as longitudinal sectioning.
What do you mean by contour line?
contour line, a line on a map representing an imaginary line on the land surface, all points of which are at the same elevation above a datum plane, usually mean sea level.
What is Profile levelling?
What is profile in profile levelling?
Profile leveling is a method of surveying that has been carried out along the central line of a track of land on which a linear engineering work is to be constructed/ laid. The operations involved in determining the elevation of ground surface at small spatial interval along a line is called profile leveling.
What is the procedure of profile levelling?
Profile leveling is a method of surveying that has been carried out along the central line of a track of land on which a linear engineering work is to be constructed The fixed line is generally the centre line of a highway, railway, canal, sewer or any other such utility.
What is the difference between differential levelling and profile levelling?
In differential leveling, there is only one foresight for each instrument setup, whereas profile leveling may have several foresights per instrument setup. The FS is subtracted from the HI to find the elevation of an unknown point.
How does profile leveling differ from differential leveling?
Which levelling method is suitable for profile levelling?
Cross sectioning levelling Cross sectioning levelling is another method in profile levelling. The term cross-section generally refers to a relatively short profile view of the ground, which is drawn perpendicular to the route centerline of a highway or other types of linear projects.
How many types of leveling are there?
The different types of Levelling are: 1. Differential Levelling 2. Check Levelling 3. Precise Levelling 4.
What is Profile levelling and cross sectioning?
In profile leveling, you determine the elevations of a series of points lengthwise along a highway. In cross-section leveling, you determine the elevations of points on a succession of lines running at right angles to the lengthwise line of the highway.