Contour Line Definition In Surveying

There are two main types of contour surveying. The contour interval for contour line is the constant vertical distance between adjacent contour lines.

Moon Pond Detail Jpg 3707 3716 Contour Map Contour Line Map Pattern

A contour is a line drawn on a map that joins points of equal height above sea level.

Contour line definition in surveying. What is contour surveying. Lines and boundaries that are established for surveying and mapping. Consider a receding water level.

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. A branch of applied mathematics that is concerned with determining the area of any portion of the earths surface the lengths and directions of the bounding lines and the contour of the surface and with accurately delineating the whole on paper Examples of surveying in a Sentence. Such lines are drawn on the plan of an area after establishing reduced levels of several points in the area.

How contour lines show a pair of small hills. A contour maps consists of contour lines which are imaginary lines connecting points of equal elevation. Contour lines must be uniformly spaced unless data to the contrary are available.

The lines are drawn. In the land property world a contour is an outline of a mass of land. A contour line is a imaginary line which connects points of equal elevation.

Surveying or survey levelling is practised to determine the differences in elevation vertical distances between various points in the field to measure distances horizontal distances to set out contour lines etc. Contour An Imaginary line on the ground surface joining the points of equal elevation is known as contour. Types of Contour Lines in Surveying and their Importance.

Such lines are drawn on the plan of an area after establishing reduced levels of several points in the area. In other words contour is a line in which the ground surface is intersected by a level surface obtained by joining points of equal elevation. A contour line also isoline isopleth or isarithm of a function of two variables is a curve along which the function has a constant value so that the curve joins points of equal value.

A contour or a contour line may be defined as the line of intersection of a level surface with the surface of ground. This line on the map represents a contour and is called Contour line. Contour surveying is the determination of various elevated points on the ground and depicting them in the contour map.

For 125 000 scale maps the interval between contours is usually 5 metres although in mountainous regions it may be 10 metres. The contour lines in an area are drawn keeping difference in elevation of between two consecutive lines constant. Contour lines or isohypses connect points of equal elevation.

Contour lines never end meet or cross except in the unusual case of a vertical or overhanging cliff or cave. Major surveying works are done by engineers or qualified surveyors using sophisticated equipment such as the levelling instrument see Fig. It is a plane section of the three-dimensional graph of the function f x y parallel to the x y-plane.

A level plane that intersects the ground surface would show on the map as a contour line. Show Characteristics of Contour Lines in Surveying. In nature you may think of the short lineof a still lake as a contour line.

Thus contour lines on a plan illustrates the topography of the area. A contour line may also be defined as the intersection of a level surface with the surface of the earth. In other words Contour is a line in which the ground surface is intersected by a level surface obtained by joining points of equal elevation.

The contour lines in an area are drawn keeping difference in elevation of between two consecutive lines constant. If theodolites are used both horizontal and vertical lines could be determined easily making things easier during the map preparation. Contour lines join points of equal elevation above the given leve.

Meander lines are run by surveyors for mapping and surveying purposes for a body of water. A contour line is a line passing through points of equal elevation. In cartography contour lines are an imaginary line of a terrain that joins the point of equal elevation above a given level such as mean sea level or benchmark.

Contour Map -A map showing contour lines is known as Contour map. This line on the map represents a contour and is called contour line. Contour Line A contour line may be defined as An imaginary line passing through points of equal reduced levels.

This means every point on a contour line has the same altitude as that of the assumed intersecting surface. In this video I am going to talk about how to plot the topographic Maps contour maps.

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