What Does A Contour Interval Of 100 Feet Mean?

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..

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 does it mean when contour lines are close together?

Contour lines that are relatively close together indicate a slope that is fairly steep. Contour lines that are further apart indicates a slope that is relatively flat.

What is the space between contour lines called?

Contour lines–usually curved, parallel brown lines–show the shape and elevation of the land by connecting points of equal elevation. … The space between the contour lines is called the contour interval and represents a specific (set) distance.

What is the contour interval in feet?

• Contour interval is always the same on a map. is the difference in elevation from one contour line to the next. For example, the contour interval on the map below is 10 feet. This means that the change in elevation between contour lines is always 10 feet.

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.

What is the importance of contour lines?

The purpose of contour lines is to represent the tridimensional shape of the terrestrial surface on a bidimensional map. Contour lines are the intersection of an horizontal plane parallel to the reference level and the topographical surface to describe. Consequently: Contour lines are always closed curves.

What is the other name of contour lines?

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.

What do the numbers on contour lines represent?

The elevation of land is its height above sea level. The numbers written on contour lines indicate the elevation of the lines. Topographic maps would be very cluttered if all contour lines were labeled, so only the heavier lines show labels. … The contour interval tells the vertical distance between neighboring lines.

What does the contour interval mean?

A contour interval is the vertical distance or difference in elevation between contour lines. 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.

What 2 types of lines show elevation differences?

Contour lines are used to show elevation on a topographic map. Lines or isolines on a map that connect points with the same elevation. What does each contour line on a map show? Each contour line shows a different elevation.

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 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.

What is meant by a contour line?

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.

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 a index line?

A contour line accentuated by a heavier line weight to distinguish it from intermediate contour lines. Index contours are usually shown as every fifth contour with their assigned values, to facilitate reading elevations.