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How to Find Contour Interval on a Topographic Map?

A topographic map, genuinely put, is a two-dimensional illustration of a component of the three-d floor of the earth. Topography is the form of the land surface, and topographic maps exist to characterize the land surface. Topographic maps are equipment used in geologic research due to the fact they exhibit the configuration of the earth’s surface. Cartographers resolve the trouble of representing the third-dimensional land floor on a flat piece of paper through the use of contour lines, as a consequence horizontal distances and vertical elevations can each be measured from a topographic map.

What Is a Contour Interval?

The nice way to familiarize your self with the thinking of contour strains and contour intervals is to find out about the legend of the map, which tells you how a ways aside in vertical ft or meters adjoining contour traces are. This may be a wide variety handy to each math (such as 10 meters, or 20 or forty feet) and the actuality of the nearby terrain. If you seem at the map itself, you will see that some contour strains are darker than others and are regularly labeled with numbers corresponding to the elevation in ft or meters. This permits you to locate a reference elevation pertaining to a spot on the map shut to or inside the region you will explore. After all, understanding how steep or flat a area is offers solely section of the story; you in all likelihood desire to now how "high" or "low" you are in absolute terms, too.

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Advantages of Contour Interval

It indicates the slope and dimension of unique landforms on the map. By searching at the contour intervals it is handy to calculate the a range of elevations of the landscape. It can be utilized in drawing cross-sections of the precise points on the mapped area.

Disadvantages of Contour Interval

Contour fail to characterize a few of the heights due to the hassle of the vertical interval. Some of the landforms can't be represented by way of making use of contours. For instance coral reef, outcrop rock, and craters. The contour approach is now not utilized to signify alleviation on a small-scale map as it may additionally uncertain a few details.

Uses of Contour Intervals in Surveying

When a giant place is to be mapped in small piece of paper contour intervals are used. A greater contour interval is used for a giant location and small contour interval for small area. In a giant map, index contour strains are much less to hold it easy to examine the map easily. In this case, to locate out the intermediate factors elevation, contour intervals are used. Earthwork estimations for any kind of shape like bridges, dams or roads can be discovered out with the assist of contour intervals in a map.

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Topographic Map Example

As an example, seem at a map of the Sulphur-Boundary Creek region alongside the Middle Fork of the Salmon River This map is a geologic map of glacial geology in the area, drawn on a topographic map base. The map has a contour interval of forty feet, which capability that each and every area between the marked 6800 foot line and the subsequent lowest line (which is 6760 feet, and now not marked) has an elevation equal or increased than 6760 feet, however much less than 6800 feet. You can discern out the elevation of any factor through discovering the nearest labeled line, counting the variety of strains above or under it, multiplying with the aid of the contour interval, and including or subtracting the end result from the nearest marked contour line. The greater carefully spaced the contour lines, the steeper the slope. You can discover out precisely how steep the slope of the place you are involved in by using subtracting the lowest elevation from the highest, and dividing the end result via the horizontal distance.

How To Read Contour Lines?

A speedy look at a topographic map will provide you a time-honored concept of the landscape. Is it flat or mountainous? If every line represents an equal factor of elevation, then any exchange in elevation would lead to inconsistent line spacing, right? For example, numerous contour strains spaced shut collectively would point out steep terrain, whilst strains spaced some distance aside would point out a gentler slope.

Factors Affecting Contour Intervals

1. Scale. The large scale is the smaller the contour interval.

2. Importance and motive for which the layout is to be used. for greater details, a small contour interval is used.

3. Accuracy, time, and price of the contour plan. For greater accuracy, a smaller interval is used.

4. Topographic version of the area For steep ground, a massive contour interval is utilized, however for flat ground, a small contour interval is utilized.

5. Size of the area For large areas, a giant contour interval is utilized.

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