- What is the use of contour lines?
- What shape are the contour lines that indicate a hill?
- What are the 5 Rules of contour lines?
- What are the characteristics of contour lines?
- How do contour lines work?
- What information does the slope tell you?
- What do circular contour lines indicate?
- What are the 3 types of contour lines on a map?
- What is meant by contour interval?
- What are Hachure lines?
- How do you calculate slope of land?
- How is grade slope calculated?
- What 2 types of lines show elevation differences?
- Why do contour lines never cross?
- How do you calculate contour lines?
- How can you use contour lines to determine slope?
- What is the space between contour lines called?
What is the use of contour lines?
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.
A contour map is a map illustrated with contour lines, for example a topographic map, which thus shows valleys and hills, and the steepness or gentleness of slopes..
What shape are the contour lines that indicate a hill?
concentric circlesWhat shape are the contour lines that indicate a hill? Hill is shown on a map by contour lines forming concentric circles. The inside of the smallest closed circle is the hilltop.
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 the characteristics of contour lines?
Other characteristics of contour lines are: – Uniform slopes have uniformly spaced lines. – Along plane surfaces, contour lines are straight and parallel. – Contour lines are perpendicular to lines of steepest slopes. – For summits or depressions, contour lines most close upon themselves.
How do contour lines work?
Contour lines are lines drawn on a map connecting points of equal elevation, meaning if you physically followed a contour line, elevation would remain constant. Contour lines show elevation and the shape of the terrain. … In order to keep things simple, topographic maps show lines for certain elevations only.
What information does the slope tell you?
The slope of a line is the change in y, y (read “delta y”), divided by the change in x, x (read “delta x”). That is, slope is , which is a rate of change. Stating the units for y and x will help clarify what the slope tells you about how the y-value changes from one x-value to the next.
What do circular contour lines indicate?
Closed circles indicate the tops of land features. One circle includes the elevation (1427 feet). These index contour lines mark an elevation of 1400 feet. Notice that index lines are darker than the other contour lines.
What are the 3 types of contour lines on a map?
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 is meant by contour interval?
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 are Hachure lines?
Hachures are short lines laid down in a pattern to indicate direction of slope. When it became feasible to map rough terrain in more detail, hachuring developed into an artistic speciality.…
How do you calculate slope of land?
The formula to use for this calculation is: %Slope = Rise Run ! ” # $ % &x100% Where Rise is the change in elevation, and Run is distance. Slope may also be referred to in terms of a ratio of the distance in which the land falls one foot.
How is grade slope calculated?
How do you calculate the percentage grade of a slope? Slope can be calculated as a percentage which is calculated in much the same way as the gradient. Convert the rise and run to the same units and then divide the rise by the run. Multiply this number by 100 and you have the percentage slope.
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 do contour lines never 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.
How do you calculate contour lines?
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.
How can you use contour lines to determine slope?
Measuring slopes on a contour map: – Slope = “rise over run”, or vertical height increase over horizontal distance. – Example: if two contour lines are 300 m apart (use map scale to find the distance between them!) and they represent elevations 50 m apart, then rise = 50 m, run = 300 m. Slope = 50/300.
What is the space between contour lines called?
The space between the contour lines is called the contour interval and represents a specific (set) distance. If the contour interval is 50 feet, the vertical space between the two contour lines is 50 feet.