Contour Survey Meaning
Contouring in surveying is the determination of elevation of various points on the land and fixing these points of same horizontal positions in the contour map.
In the land property world, a contour is an outline of a mass of land. Main objective of conducting contour surveys is to identify any noticeable difference in elevation of the existing land. In land surveying a contour map is a map illustrated with contour lines, for example a topographic map, which thus shows valleys and hills, and the steepness or gentleness of slopes. Learn more…
A contour map is very useful since it provide valuable information about the land. Contour survey is carried out at the starting of any engineering project such as a road, a railway, a canal, a dam, a building etc.
Methods of Contouring
There are two methods of Contouring.
- Direct method
- Indirect method
Direct Method of Contouring
In this method, the contours to be located are directly traced out in the ground by locating and making a number of points on each contour. These points are then surveyed and plotted on plan and the contours drawn through them. Direct method of contouring is the most accurate but very slow and tedious as a lot of time is wasted in searching points of the same elevation for a contour. Direct Method of Contouring is suitable for small areas and where great accuracy is required.
Indirect Method of Contouring
In Indirect Method of contouring, levels are taken at some selected points and their levels are reduced. Hereby in this method horizontal control is established first and then the levels of those points found. After tracing the points on the plan, reduced levels are marked and contour lines are interpolated between the selected points.
- It depicture slope and size of different landforms on map.
- It provides complete and clear image of the land and the surrounding area.
- By reading contour interval it is easy to sort out the different elevation of the landscape.
- It provide the basis for coloring method.
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