(i) Contour lines are isolines of height. (ii)
These are drawn by joining the places of equal altitude
. (iii) These help in identification of land forms and their altitude from sea level.
What are contour lines?
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 difference in elevation between contour lines. Index contours are bold or thicker lines that appear at every fifth contour line.
What is contour lines short answer?
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. … Numbers on the lines give the height in feet. (Sea level is zero.) Lines drawn closely together indicate that a slope is steep.
What is a contour line kid definition?
Contour lines are
curved or straight lines on a map describing the intersection of a real or hypothetical surface with one or more horizontal planes
. The configuration of these contours allows map readers to infer relative gradient of a parameter and estimate that parameter at specific places.
What are the 3 types of contour lines?
Contour lines are of three different kinds. They are
the Index lines, Intermediate lines and the Supplementary lines
.
What are contour lines for Class 8?
Contour lines are
lines drawn on a topographic map connecting points of equal elevation
. They are also called “level- lines”.
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 main types of contour lines?
- 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.
How are contour lines used?
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 is an example of contour?
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 are the characteristics of contour lines?
- Must close on themselves, on or off the map.
- Perpendicular to the direction of max. …
- Slope between them is assumed uniform.
- The distance between them indicates the steepness of the slope, gentle or steep.
- Irregular signify rough, smooth signify gradual slopes.
What are 4 types of contour lines?
- Isopleth. Isopleth on a contour map connects the places having the same value of some measurable quantity of geographical or meteorological phenomena. …
- Isohyet. …
- Isobar. …
- Isobath. …
- Isohaline. …
- Isotherm. …
- Isohel. …
- Isohume.
How do you get contour lines?
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.
How do you measure contour lines?
Lighter contour lines do not have elevations, but can be determined by
counting up or down from the nearest index contour line and multiplying by the contour interval
. The contour interval is stated on every topographic map and is usually located below the scale.
What are contour lines Class 9?
Contour lines are
lines drawn on a map connecting points of equal elevation
. If we walk along contour line we neither gain or lose elevation. The contour line represented by the shoreline separates areas that have elevations above sea level from those that have elevations below sea level.
