Elevation Contours
Definition
Elevation Contours are lines drawn on a map that connect points of equal elevation above a given datum, usually mean sea level. These lines help visualize the shape and gradient of the land surface, making them essential in topographic mapping. Contour spacing indicates slope steepness: closely spaced lines represent steep areas, while wider spacing indicates gentle slopes.
Application
Civil engineers use elevation contours for site grading, road design, and drainage planning. Environmental scientists analyze contours to understand watershed boundaries and erosion risks. GIS software such as ArcGIS and QGIS generates contour lines from digital elevation models (DEMs) for analysis and map production.
FAQ
What do elevation contours represent?
They connect points of the same height, revealing terrain shape and slope steepness.
How are contours created in GIS?
By extracting lines of equal value from DEMs using interpolation tools.
Why are elevation contours important?
They support terrain visualization and are crucial for planning and environmental analysis.
Where are they used?
In engineering, topographic maps, hydrology, and land-use planning.
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