These lines are evenly spaced apart. We call this spacing the contour interval. For example, if your map uses a 10-foot contour interval, you will see contour lines for every 10 feet (3 meters) of elevation — lines at 0, 10, 20, 30, 40 and so on. Different maps use different intervals, depending on the topography.
What is meant by 1 50000 on a topographical sheet? SCALE : Scale is the ratio between the distance of any two points on the map and the actual distance of the same points on the ground. The scale of the given map extract is 2 cm: 1 km or 1:50,000. 3. CONTOUR: Contours are imaginary lines drawn on maps, joining all places with the same height above sea level. 4.
Similarly, How do you read contours on a topographic map?
How do you label contour lines on a topographic map?
Other than the obvious trails and rivers, these squiggly lines are contour lines. Put simply, contour lines mark points of equal elevation on a map. If you trace the length of a line with your finger, each point you touch is the same height above sea level.
What are the contour lines on a contour map Brainly?
Contour lines are an imaginary lines drawn on a map by joining all the same height points (above the mean sea level) on the earth. It is a plane section representing 3D graph.
What is contour interval of SOI maps?
Contours are drawn at different vertical intervals (VI), like 20, 50, 100 metres above the mean sea level. It is known as contour interval. It is usually constant on a given map. It is generally expressed in metres.
How are contour lines drawn on maps? Contour lines are lines drawn on a map with equal elevation points, so elevation would be constant if you followed the contour line physically. The elevation and terrain shape of the contour lines shows. It is useful because they show the form of the land surface on the map–its topography.
What do the contour lines of a plateau look like? The contour lines representing a plateau are normally close spaced at the margins with the innermost contour showing wide gap between its two sides. A geomorphic feature lying between two hills or ridges and formed as a result of the lateral erosion by a river or a glacier is called a valley. It resembles the letter V.
What do contours on maps indicate?
Contours are imag- inary lines that join points of equal elevation on the surface of the land above or below a reference surface, such as mean sea level. Contours make it possible to measure the height of mountains, depths of the ocean bottom, and steep- ness of slopes. A topographic map shows more than contours.
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. map: contour lines. The diagram illustrates how contour lines show relief by joining points of equal elevation.
Why are contours important in map reading?
These contour lines are an important way of showing the rise and fall of the land on a map. Contour lines show all the places that are the same height above sea level. They also tell us about the slope of the land. On a steep slope, the lines are close together.
Does the contour interval for a map change? Index contour lines: Every fifth contour line is a thicker, “index” line. At some point along that line, its exact elevation is listed. Contour interval: The change in elevation from one contour line to the next is always the same within the same map.
How do you do contour lines?
What are map contour lines?
A contour line is a line drawn on a topographic map to indicate ground elevation or depression. A contour interval is the vertical distance or difference in elevation between contour lines. … If the numbers associated with specific contour lines are increasing, the elevation of the terrain is also increasing.
What is a contour answer? Solution. A contour line is an imaginary line on a map connecting points at the same height above sea level.
What is contouring Class 8?
Contour – Brown continuous curved lines joining the places having the same height or elevation above the mean sea level. It shows elevation, steepness and shape of the land.
What is a contour index?
Contour Index are bold and thicker lines that appear at an interval of every fifth contour line. The increase in the number associated with specific contour lines shows the elevation of the terrain is also increasing and vice versa.
What is the contour interval of the map quizlet? A contour line on a topographic map connects points of equal elevation. The change in elevation from contour line to contour line is called the contour interval.
What is a contour interval and on what factors does it depend?
The contour interval depends upon the general topography of the terrain. In flat ground, contours at small intervals are surveyed to depict the general slope of the ground whereas high hills can only be depicted with contours at larger contour interval.
How do you make contour lines on a topographic map?
How do you read contour lines on a topographic map?
How To Read Contour Lines
- Index lines are the thickest contour lines and are usually labeled with a number at one point along the line. …
- Intermediate lines are the thinner, more common, lines between the index lines. …
- Supplementary lines appear as dotted lines, indicating flatter terrain.
What is contour pattern of mountain? You’re out mountain climbing with your friends. You pull out your map and see two hiking trails. The first route has closely-spaced contour lines. … This is because when contours are close together, it means that the slope is steeper. For a quick definition, a contour line joins points of equal and constant values.
What is the contour interval of the given map extract?
(e) Contour interval means the difference between two consecutive contour lines. Contour interval of the given toposheet is 20 metres.