Contour Interval On A Topographic Map
Contour Interval On A Topographic Map
Click to see full answer. Contour Interval on Topographic Map Index contours are prominent or dense lines that bob up at every 5th isometric line. The index contours are a darker or wider brown line in comparison to the regular contour lines. A contour interval in surveying is the vertical distance or the difference in the elevation between the two contour lines in a topographical map.
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If the contour interval is not printed on the map it can be calculated.
Contour Interval On A Topographic Map. Index contours are bold or thicker lines that appear at every fifth contour line. It is common for a professional topographic map of engineer-quality to have a contour interval of 50 cm or about 2 feet in some parts of the world. Thus 100 feet divided by 5 equals 20 feet.
A contour interval is the vertical distance or difference in elevation between contour lines. What three factors are shown on a topographic map. Common Topographic Map Symbols.
On most maps every fifth contour line shown as a heavier or darker line is an index line or index contour. If there are 4 contour lines between the indexes add 1 to reach the number 5. For instance if the map uses a 20-foot interval there are contour lines at zero 20 40 60 80 and 100 feet.
The contour interval is an even space that represents an increase in elevation. Considering the size of the area to be mapped contour intervals are assumed. A contour interval may be a perpendicular distance or dissimilarity in altitude between two adjacent contour lines in a topographic map.
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