Contour Lines Interpretation
Contour lines on a map connect points of equal elevation. The spacing and pattern of these lines provide information about the steepness and shape of the terrain.
Parallel Contour Lines Explained
When contour lines are parallel, it indicates that the slope is consistent along that section of the map. The specific feature shown depends on the spacing:
- Closely spaced parallel lines: Indicate a steep slope.
- Widely spaced parallel lines: Indicate a gentle slope.
- Evenly spaced parallel lines: Indicate a uniform slope, meaning the steepness is constant.
Feature Analysis
- Flat plains: Represented by contour lines that are very far apart or absent, showing minimal elevation change.
- Hills: Typically shown as closed contour loops, with elevations increasing towards the center.
- Steep slope: Indicated by contour lines that are parallel and very close together.
- Uniform slope: Shown by contour lines that are parallel and evenly spaced. This means the rate of elevation change is constant.
Therefore, parallel contour lines, specifically when implying consistent elevation change, represent a uniform slope.
Important Questions from Contouring
Identify the correct statements.
i. Contour lines form sharp V-shaped curves across valley line, with the convex side of the curve towards the higher ground.
ii. Contour lines form U-shaped curves across valley line, with the convex side of the curve towards the higher ground.
iii. Contour lines form U-shaped curves across ridge line, with the concave side of the curve towards the higher ground.
iv. Contour lines form sharp U-shaped curves across ridge line, with the convex side of the curve towards the higher ground.
Two contour lines of same elevation:
The suitable contour interval for a map with scale 1:50,000 is
Contour lines cross a ridge or valley line at
_______ are lines drawn on a map to locate, in the plan view, points of equal ground elevation.
