How do you find the contour interval on the map?
- Scale of the map. 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.
- Availability of time and funds.
How do you determine the contour interval?
How do you find the contour interval? What Is the Contour Interval Equal To? 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.
Why is the contour interval included on a topographic map?
Why is the contour interval included on a topographic map? It tells you the change in elevation from line to line. The mercator projection map shows Earth’s features on a grid. How do you find 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.
What are the factors which determine contour interval?
What Is Contour Interval?
- Calculation of Contour Intervals. A map legend usually identifies the contour interval on the map, but sometimes only part of a map is available.
- Uses of Contour Intervals in Surveying. ...
- Reading Contour Lines. ...
- Contour Lines. ...
- Land Features. ...
- USGS Maps. ...
- Orienting the Map. ...
How do you find contour interval on a map?
1:082:40Determine Contour Interval and Contour Line Values - YouTubeYouTubeStart of suggested clipEnd of suggested clipBy simply adding 20 feet counting up from the lower elevation of an index line or counting down soMoreBy simply adding 20 feet counting up from the lower elevation of an index line or counting down so for example with this line right here.
What is the contour interval between the two index contours?
5th contour lineThe 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 contour interval of the map quizlet?
What is the contour interval on a map based on? The relief in the area. The difference in elevation between the highest and lowest points in the area on the map.
How do you read contour intervals?
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 — lines at 0, 10, 20, 30, 40 and so on. Different maps use different intervals, depending on the topography.
Contour Interval
A contour interval is a vertical distance or difference in elevation between contour lines. Index contours are bold or thicker lines that appear at...
Contour Lines
Contour lines are lines drawn on a map connecting points of equal elevation, meaning if you physically followed a contour line, elevation would rem...
Contour Interval on Topographic Map
A contour line is a line drawn on a topographic map to indicate ground elevation or depression. A contour interval is a vertical distance or differ...
What is the Contour Interval of the Map?
A contour interval is the vertical distance or difference in elevation between contour lines. Index contours are bold or thicker lines that appear...
Contour Lines and Contour Intervals
A contour line is a line drawn on a topographic map to indicate ground elevation or depression. A contour interval is the vertical distance or diff...
Contour Index
Index contours are bold or thicker lines that appear at every fifth contour line. If the numbers associated with specific contour lines are increas...
Uses of Contour Intervals in Surveying
A higher contour interval is used for a large area and small contour interval for small area. In a large map, index contour lines are less to keep...
What Is the Contour Interval Equal To?
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, th...
What Is the Purpose of Contour Interval?
A contour line is a line drawn on a topographic map to indicate ground elevation or depression. A contour interval is the vertical distance or diff...
What Is the Difference Between Contour Interval and Scale?
Scale and Contour Interval. Contour Interval: The contour interval on a topographic map is the vertical distance between one contour line and the n...
Where is the contour interval?
Before you ever start analyzing contours, you should determine the contour interval which is found in the bottom center of the map. To determine the elevation of a point, you must have a reference line from which to start. This reference line is an index contour.
How many contour lines are there in a map?
Maps generally count five contour lines from one index line to the next, including the next index line. As with counting from one number to the next, like from five to 10, Start with the next line of the index line, Counting each contour line up to and including the next index line.
What is index contour?
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. If the numbers associated with the contour lines are decreasing, there is a decrease in elevation.
Why are index contours labeled?
To make topographic maps easier to read, every fifth contour line is an index contour. Because it’s impractical to mark the elevation of every contour line on the map, the index contour lines are the only ones labeled. The index contours are a darker or wider brown line in comparison to the regular contour lines.
What does a contour line mean?
A single contour line marks an equal elevation line, which means that if the contour line measures an elevation of 1,000 feet above average sea level, all points along that line are 1,000 feet above average sea level.
What is contour map?
A contour map consists of contour lines for a given geographic region. To keep the contour map simple and easy to read, not all contour lines are marked with their elevation reading. These marked or labeled lines are known or called Contour lines of the index.
What is the purpose 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.
Where to find contour intervals?
You can find the contour interval in the map key, usually located underneath the scale of the map at the bottom center. To understand all map symbols, see the US Gov document. Example: The contour interval is 50 feet according to the map key.
What are the three types of contour lines?
There are 3 kinds of contour lines you’ll see on a map: intermediate, index, and supplementary. 1. Index lines are the thickest contour lines and are usually labeled with a number at one point along the line. This tells you the elevation above sea level. 2.
What is the best app to turn topographic view?
Google Maps. You can turn their topographic view (complete with contour lines) by selecting the “Terrain” layer from the options menu. Gaia. iPhone users can use Gaia GPS. It is an elegantly designed map program with topographic maps available for download.
What is topography in geography?
Topography is the study of geographical features on a landscape. A map with contour lines on it is called a topographic map. Topographic maps use a combination of colors, shading and contour lines to represent changes in elevation and terrain shape. Essentially, topographic maps represent the three-dimensional landscape ...
Why are contour lines important?
Contour lines are critical to understanding the elevation profile of your terrain or a particular land formation.
What does a supplement line mean?
Supplementary lines appear as dotted lines, indicating flatter terrain. If you’re looking at an index line, it's easy to read the elevation because it is clearly labeled. However, interval lines are somewhat trickier. To determine their elevation, you’ll need to know the contour intervals.
What is the V shape of a river?
Rivers, of course, are represented by blue lines that will run through the center of the V-shape. Sometimes called draws, the V-shape of this feature always points towards their peak. You can also use a topographic map to determine the direction the river is flowing.
What is contour interval?
In short, contour interval is a vertical distance or difference in height between contour lines whereas index controls are bold or thick lines that appear on each fifth contour line .
How to find the difference between two contour lines?
Step 2: Calculate the difference between the 2 selected index contour lines from a map. To take the difference, subtract the upper elevation line with lower elevation line. Step 3: Now calculate the number of non-index lines contour lines between ...
Why isn't scaling required on contour maps?
Measurement or scaling is not required because contour levels are indicated on contour lines. The distance needs to be measured on the map and multiplied with the dimensions of the map to be transformed to actual distance. The contour interval in a given map is constant.
