What is the distance between each contour line called?
A contour interval is the vertical distance or difference in elevation between contour lines.
What is the contour interval for the map?
Individual contour lines on a topographical map are a fixed interval of elevation apart known as a contour interval. Common contour intervals are 5, 10, 20, 40, 80, or 100 feet. The actual contour interval of a map depends upon the topography being represented as well as the scale of the map.
What are the 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.
What do contour lines show?
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. The diagram illustrates how contour lines show relief by joining points of equal elevation.
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.
How do you calculate the contour interval?
1. How to find contour interval? To find contour interval divide the difference in elevation between the index lines by the number of contour lines from one index line to the next. For example, if the distance 200 is divided by the number of lines, where the number of lines is 5.
What are the 3 types of contour drawing?
There are several different types of contour line drawings:
- Blind Contour. ‘Blind contour drawing’ is when contour drawing is done without looking at the paper AT ALL.
- Continuous Line Contour.
- Modified Contour.
- YOUR ASSIGNMENTS:
What is every 5th contour line called?
To make topographic maps easier to read, every fifth contour line is an index contour. The index contour lines are the only ones labeled. The index contours are a darker or wider line in comparison to the regular contour lines. Elevations are marked on the index contour lines only.
What is a good contour interval?
The commonly used contour interval is 20 feet for a 1:24,000 map scale.
What are the 4 rules of topographic maps?
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.
Who invented contour drawing?
As a method of teaching art, contour drawing was popularized by Kimon Nicolaïdes in The Natural Way to Draw (1941).
What are the 5 Rules of topographic maps?
Topographic Map Rules
- Contour Lines Never Cross.
- Measuring Steepness.
- Stream Flow Direction.
- Contours Close.
- Concentric Circles.
- Elevation Between Lines.
What is a Hachure line?
Definition of hachure (Entry 1 of 2) : a short line used for shading and denoting surfaces in relief (as in map drawing) and drawn in the direction of slope.
How do you read elevation?
Run the detector and / or front rod section up or down until you pick up the “on grade” signal from your detector. Read the number opposite the pointer. That number is your true elevation. If using an optical instrument, just read the number across the horizontal line.