Quick Answer: What Does The Contour Interval Mean?

What are 3 types of contour lines?

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.

Intermediate lines are the thinner, more common, lines between the index lines.More items….

What are the basic features of contour lines?

Other characteristics of contour lines are: – Horizontal distance between contour lines is inversely proportional to slope. – Uniform slopes have uniformly spaced lines. – Along plane surfaces, contour lines are straight and parallel. – Contour lines are perpendicular to lines of steepest slopes.

Which information does a thicker contour line provide quizlet?

A darker, heavier contour line that is labeled with an elevation. It is usually every fifth line that indicates a change in elevation.

What are the methods of contouring?

Methods of ContouringDirect Methods. It consists in finding vertical and horizontal controls of the points which lie on the selected contour line. … Method of Cross-section: In this method cross-sectional points are taken at regular interval. By levelling the reduced level of all those points are established. … Drawing Contours.

What is horizontal equivalent in contouring?

The horizontal distance on the earth’s surface between successive contours. The height interval between the successive contours is known as a vertical interval. For a given vertical interval, the smaller the horizontal equivalent, the steeper is the average slope.

What is the contour interval 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. such as 1,600 or 2,000 feet.

What does Hachured contour lines mean?

One other aspect about contour lines requires special attention. A valley always has a lower end, but a DEPRESSION is an area that is COMPLETELY surrounded by higher elevation. … These contours are called HACHURED contour lines. Hachured contour lines have tick marks added to them that point DOWNSLOPE.

What is a contour interval and on what factors does it depend?

Answer. Answer: 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.

What are the uses of contour map?

Uses of contours mapsUses of contours maps. Contours provide valuable information about the nature of terrain. … Nature of Ground. To visualize the nature of ground along a cross section of interest,To Locate Route. … Intervisibility between Stations. … To Determine Catchment Area or Drainage Area. … Storage capacity of a Reservoir.

How do you determine the contour interval?

Divide the difference in elevation between the index lines by the number of contour lines from one index line to the next. In the example above, the distance 200 is divided by the number of lines, 5. The contour interval is equal to 200 / 5 = 40, or 40-unit contour intervals.

What are the 5 Rules of contour lines?

Rule 1 – every point of a contour line has the same elevation. Rule 2 – contour lines separate uphill from downhill. Rule 3 – contour lines do not touch or cross each other except at a cliff. Rule 4 – every 5th contour line is darker in color.

Which of the following is the best definition for contour line?

Rules of Contour Lines In other words, contour lines connect points of equal elevation. By definition, contour lines separate points of higher elevation from points of lower elevation. This means it is always possible to define an “uphill” direction on one side of a contour and a “downhill” direction on the other side.

What is vertical equivalent?

Vertical Interval is the vertical distance between two contour lines. Horizontal Equivalent is the actual distance between two points on two contour lines. Slope of the land is known as the gradient. … Gradient = Vertical Interval/Horizontal Equivalent.

What is the difference between contour interval and horizontal equivalent?

Explain Terms Used in Contouring….What is the Difference Between Contour Interval and Horizontal Equivalent.S.NoContour IntervalHorizontal Equivalent3In a given map the contour interval is a constantThe horizontal equivalent varies with slope. Closer distance indicates steep slope and wider distance gentle slope2 more rows

What is the factors affecting contour interval?

FACTORS FOR DECIDING CONTOUR INTERVAL The contour interval is kept inversely proportional to the scale of the map. Purpose of the map. The contour interval on a map also depends upon the purpose for which the map is to be utilized. Nature of the ground.

Why can’t contour lines cross?

Contour lines can never cross one another. Each line represents a separate elevation, and you can’t have two different elevations at the same point. … Moving from one contour line to another always indicates a change in elevation.

What is contour gradient?

A line marked on the ground surface at a given constant slope.

What information does a thicker contour line provide?

When contour lines are close together on a map, it shows a steeper slope of the terrain. In contrast, when contour lines are far apart, it shows a flatter terrain. The thicker, sometimes darker-brown, contour lines with an elevation number denoted are called index contours.