These index strains will be mentioned with their elevation. Discover the elevations of two adjoining index lines. The largest range shows the uphill rise. Locate the distinction between the two elevations.
A contour map includes contour traces of a given geographical region. To keep the contour map convenient and comprehensible to read, now not each contour line is marked with its elevation reading.
These marked or tagged strains are remembered or termed index contour Lines. In the above picture, the darkish traces with analyzing are index contour lines.
Generally, there are a number contour intervals for the a range of maps. Taking the location to be mapped, contour intervals are considered. In each map, on the right-hand backside side, the contour interval is described. The often utilized contour interval is 20 toes for a 1:24,000 map scale.
To calculate contour interval, we want to divide the distinction in elevation between the index contour traces through the range of contour traces from one index contour line to the next.
For example, if the distance 200 is divided via the quantity of lines, the place the range of traces is 5. The contour interval is equal to 200 / 5 = 40, or 40-unit contour intervals.
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There are three kinds of contour traces detected on a map,
The darkish labelled strains are referred to as index contours due to the fact index contour ambitions to inform you an actual elevation at a specific factor in areas between the two contour indexes, permitting you to work outward, and therefore downward or upward, from there. The related elevations peak generally quit in zero for convenience, though on metric maps, they on occasion cease in four or 5.
The last contours are named intermediate contours. These commonly fall in between the index contour lines. The Intermediate contour strains are finer than index contours and do now not have their elevations named on them.
There are primarily 4 intermediate contour lines between any two successive index contour lines.
In some unique areas on a map, the traditional interval is occasionally too huge to characterize a huge alternate in elevation, such as on-level terrain, and therefore, greater half-interval contours are added. These sorts of contours are named supplementary contours or shape lines.
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The primary attribute of the contour can be listed as follows: