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If the contour interval is not given, find two reference (labeled) contour lines and find the number of lines between them, excluding the reference lines themselves. Then the interval can be found using the following formula:

|(Difference between elevation of reference lines)|

/(Number of contour lines between reference lines +1) = Contour interval

For example, if you find two reference lines labeled 150m and 250m and there is one contour line between them, then

|150m-250m|/(1+1)=100m/2=50m

The contour interval of that map is 50 meters.

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How do you use contour intervals?

Contour intervals are used to represent changes in elevation on a topographic map. The interval is the difference in elevation between adjacent contour lines. By looking at the contour lines, you can visualize the shape of the land, such as steep slopes, valleys, or hills.


What is contour interval of orthophoto map?

An orthophoto map is an aerial photograph that has been geometrically corrected to ensure that the scale is uniform and that it accurately represents the Earth's surface. However, orthophoto maps do not typically have contour intervals, as they are photographic representations rather than topographic maps. Contour intervals are associated with maps that use contour lines to represent elevation changes, like topographic maps, and indicate the vertical distance between successive contour lines. In summary, while orthophoto maps provide detailed visual information of terrain, they do not feature contour intervals.


Is a contour interval for a given topographic map always the same?

No, the contour interval can vary between different topographic maps based on the scale and detail of the map. Smaller scale maps may have larger contour intervals, while larger scale maps may have smaller contour intervals to show more detailed elevation changes.


What is the elevation between two side-by-side contour lines called?

The elevation difference between two side-by-side contour lines is known as the contour interval. It represents the vertical distance in elevation between each contour line on a topographic map.


Why do contour interval on a topographic map of a mountainous area usually large?

Contour intervals on a topographic map of a mountainous area are usually large to effectively represent the significant elevation changes over relatively short horizontal distances. This helps to avoid overcrowding of contour lines, making the map easier to read and interpret. Larger intervals also allow for a clearer depiction of the terrain's steepness and major features, which is particularly important in rugged landscapes. Additionally, using larger intervals can help highlight important elevation differences that are relevant for navigation and understanding the landscape.

Related Questions

How do you use contour intervals?

Contour intervals are used to represent changes in elevation on a topographic map. The interval is the difference in elevation between adjacent contour lines. By looking at the contour lines, you can visualize the shape of the land, such as steep slopes, valleys, or hills.


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Explain contour lines and contour intervals and what they tell you about a topographic map?

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Exact height of a location on a topographic map is called?

Contour intervals


What is contour interval of orthophoto map?

An orthophoto map is an aerial photograph that has been geometrically corrected to ensure that the scale is uniform and that it accurately represents the Earth's surface. However, orthophoto maps do not typically have contour intervals, as they are photographic representations rather than topographic maps. Contour intervals are associated with maps that use contour lines to represent elevation changes, like topographic maps, and indicate the vertical distance between successive contour lines. In summary, while orthophoto maps provide detailed visual information of terrain, they do not feature contour intervals.


Contour intervals are most likely to be smallest on maps of?

Relatively flat terrain.


If the contour intervals doubled how many contour lines are needed to show same elevation?

If the contour intervals doubled, you would need half as many contour lines to represent the same elevation range. For example, if originally the contour interval was 10 meters, and it is increased to 20 meters, each contour line would now represent a larger elevation change. Therefore, to depict the same range of elevation, the total number of contour lines required would be reduced by half.


Is a contour interval for a given topographic map always the same?

No, the contour interval can vary between different topographic maps based on the scale and detail of the map. Smaller scale maps may have larger contour intervals, while larger scale maps may have smaller contour intervals to show more detailed elevation changes.


What are the factors effecting?

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What is the elevation between two side-by-side contour lines called?

The elevation difference between two side-by-side contour lines is known as the contour interval. It represents the vertical distance in elevation between each contour line on a topographic map.


What are contour intervals and contour lines?

Acontour line (also level set, isopleth, isoline, isogram or isarithm) of a function of two variables is a curve along which the function has a constant value.[1] In cartography, a contour line (often just called a "contour") joins points of equal elevation (height) above a given level, such as mean sea level.[2] A contour map is a map illustrated with contour lines, for example a topographic map, which thus shows valleys and hills, and the steepness of slopes.[3] The contour interval of a contour map is the difference in elevation between successive contour lines.[4] A contour interval is basically the same thing.


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