Horizontal call the curve drawn through the area points having identical marks. To transfer on the card of feature of a relief, it is necessary to carry out not one, and several such lines. They turn out as a result of relief section the parallel planes which are as equals on height distances from each other.
It is required to you
- - GPS navigator;
- - level;
- - compass;
- - card with a coordinate grid;
- - reference points or wooden pegs;
- - geographical object.
Instruction
1. Define a type of an object which relief you should designate. Mountains, ridges, cols, hollows and hollows belong to the main forms of a relief. Find reference points and determine their coordinates. The mountain it will have a top, at the ridge - the highest of tops and the top point of the line of a watershed. For the col it is important to find tops and the lowest point of the deepening which is between them. For a hollow the bottom, and is important for a hollow - the beginning of the line of a spillway. Determine their coordinates by the navigator. Plot points.
2. Determine height above sea level of the highest and lowest points of a relief. It can also be made by means of the navigator. Plot results. Calculate the general height or depth of object H, having taken away from an indicator of the highest point result for the lowest.
3. Calculate h relief section height. It represents H, private from division of height, into equal quantity of parts. It depends on the scale of the card and complexity of a relief. For the large-scale map height of section has to be less, that is it is necessary to divide the general height into bigger quantity of parts. On 1 sq. dm of the card there have to be 5 marks or even more.
4. Begin to take out marks from the longest line. The mountain it will have a bottom, at a hollow - its top part. Bypass with the navigator and the card an object on perimeter. Look for the points having the same height above sea level. Having found such point, plot it, having written down coordinates. The number of measurements depends on complexity of a relief too.
5. Having returned to a starting point, connect all designations by the closed curve. It is also a horizontal. On cards it is usually designated by the line of brown color. Sign a mark. The top part of figures has to be directed towards increase in a relief. In precisely the same way plot also other horizontals.