There are 3 kinds of contour lines you’ll see on a map: intermediate, index, and supplementary. Index lines are the thickest contour lines and are usually labeled with a number at one point along the line.
What are contour lines answer?
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. The diagram illustrates how contour lines show relief by joining points of equal elevation.
How many types of contouring are there?
A. Contour lines are of three different kinds. They are the Index lines, Intermediate lines and the Supplementary lines.
What is contour and its types?
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. Characteristics of Contour Lines in Surveying. Types of Contour Lines in Surveying and their Importance. 1. Isopleth.
What is a major contour line?
Index contours are lines of different colors, styles, or widths that appear at a regular frequency. With simple and logarithmic contour levels, this is called Major Contours.
What is a index contour line?
Index contours are bold or thicker lines that appear at every fifth contour line. If the numbers associated with specific contour lines are increasing, the elevation of the terrain is also increasing. If the numbers associated with the contour lines are decreasing, there is a decrease in elevation.
What is every fifth contour line called?
To make topographic maps easier to read, every fifth contour line is an index contour. The index contour lines are the only ones labeled. The index contours are a darker or wider line in comparison to the regular contour lines. Elevations are marked on the index contour lines only.
What is a depression contour line?
A closed contour, inside of which the ground or geologic structure is at a lower elevation than that outside, and distinguished on a map from other contour lines by hachures marked on the downslope or downdip side. Ref: AGI.
What do the V shaped contour lines represent?
The “V” shape contours indicate streams and drainage. As you can see, the “V” points uphill to a higher elevation. Generally, you can connect the apexes of the upward-pointing, “V” shaped contour lines to delineate a stream.
Can one contour line have multiple elevations?
Contour lines are used to represent elevation on a contour map. Each contour line represents a different elevation, and you can’t have two different elevations at the same point. An example would be how 500 meters above sea level will never be equivalent to 1000 meters above sea level.
