Simply so, What is a contour interval on a topographic map example? 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 u2014 lines at 0, 10, 20, 30, 40 and so on. Different maps use different intervals, depending on the topography.
How do you determine the contour interval? The contour interval is inversely proportional to the scale of the map. If the scale is small, the contour interval should be large and vice versa. The general terrain of the area determines the contour interval. For a flat area, the contour interval should be small.
Subsequently, What do you mean 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 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.
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 is the difference between contour interval and horizontal equivalent?
Contour Interval: The constant vertical distance between two consecutive contours is called the contour interval. Horizontal Equivalent: The horizontal distance between any two adjacent contours is called as horizontal equivalent. while the horizontal equivalent is variable and depends upon the slope of the ground.
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 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 the contour interval on your map? A contour interval in surveying is the vertical distance or the difference in the elevation between the two contour lines in a topographical map. Usually there are different contour intervals for the different maps. Considering the size of the area to be mapped, contour intervals are assumed.
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 are the 3 factors that should be considered upon planning and designing of a contour interval to be used for a topographic map? What are the 3 factors that should be considered upon planning and designing of a contour interval to be used for a topographic map?
- 1) Scale of the map. The contour interval is kept inversely proportional to the scale of the map. …
- 2) Purpose of the map. …
- 3) Nature of the ground. …
- 4) Availability of time and funds.
What is the contour interval in Figure 2?
Contour interval is the difference in elevation between two adjacent contour lines. In Figure 2-5, the contour interval is 40 feet.
How do contour lines indicate streamflow on a topographic map?
All rivers flow downhill from higher to the lower elevations, perpendicular to the contour line above it. As a rule of thumb, the V-shaped contour is pointing upstream (the opposite direction from the flow of a stream or river). The “V” shape contours indicate streams and drainage.
What is the elevation between contour lines? The elevation difference between two adjacent contour lines is called the contour interval (CI). Usually the contour interval is noted on the map legend. In most topographic maps every 5th contour line is drawn in bold print or wider than other contours. Such lines are called index contour lines.
What is the difference between contour interval and vertical interval?
So according to your question the difference between contour interval and vertical interval is that that the contour intervals are the difference in elevation between 2 successive contours whereas the vertical intervals is the distance between any two contours.
Is the contour interval constant?
Contour: Line joining points of the same elevation is called contour line. … The elevation difference between two consecutive contours is called contour interval. It is always kept the same or constant for a map.
How must contour lines bend on a topographic map to indicate a stream valley? A contour line that bends to form a V shape indicates a valley. The bend in the V points toward the higher end of the valley; this V points upstream, or in the direction from which the water flows, if there is a stream. Contour lines that form closed loops indicate a hilltop or a depression.
How do you do contour mapping?
The two ways to establish a contour map are the cross-section method and the trace contour method. To use the cross-section method, set a control or reference line at the center of the lot, then lay out and stake a grid; the elevation is determined at each stake in the grid relative to a benchmark.
What is meant by the contour interval on a topographic map quizlet? Contour Interval. The difference between adjacent contour lines. Adjacent means next to. It is usually shown in or near the map’s legend. The difference in elevation between one contour line and the next.
What is a contour line on a topographic map quizlet?
contour line. A line on a topographic map that connects points of equal elevation.
How do you read a groundwater contour map?
What do contour lines on a topographic map represent?
Elevation contours are imaginary lines connecting points having the same elevation on the surface of the land above or below a reference surface, which is usually mean sea level. Contours make it possible to show the height and shape of mountains, the depths of the ocean bottom, and the steepness of slopes.
How contours are drawn during topographical survey? In this method, the contours to be located are directly traced out in the ground by locating and making a number of points on each contour. These points are then surveyed and plotted on plan and the contours drawn through them.
How do you draw topographic contour lines?
Don’t forget to share this post !