Drawing an object on a map along rectangular coordinates with a compass or ruler. OBZhD

BASICS OF SAFE LIFE
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Drawing an object on a map along rectangular coordinates with a compass or ruler. Basics of safe life

Fundamentals of Safe Life Activities (OBZhD)

First of all, according to the coordinates of the object in kilometers and the digitization of kilometer lines, a square is found on the map in which the object should be located.

The square of the location of the object on a map at a scale of 1:50, where kilometer lines are drawn through 000 km, is found directly by the coordinates of the object in kilometers.

Drawing an object on a map using rectangular coordinates with a compass or ruler
Rice. 6.18. Drawing objects on the map by rectangular coordinates

On a 1:100 scale map, kilometer lines are drawn through 000 km and signed with even numbers, therefore, if one or two object coordinates in kilometers are odd numbers, you need to find a square whose sides are signed with numbers one less than the corresponding coordinate in kilometers.

On a 1:200 scale map, kilometer lines are drawn through 000 km, so the sides of the desired square will be signed with multiples of four, less than the corresponding coordinate of the object in kilometers by one, two or three kilometers. For example, if the coordinates of an object are given (in kilometers) X= 6755 and Y = 4613, then the sides of the square will have digits 6752 and 4612. After finding the square in which the object is located, the distance of the object from the lower side of the square is calculated and it is plotted on the map scale from the lower corners of the square upwards. A ruler is laid to the obtained points and from the left side of the square, also on a map scale, a distance equal to the distance of the object from this side is set aside.

On fig. 6.18 shows an example of mapping an object А by coordinates X = 3, Y = 29.

Drawing an object on a map with a coordinator engraved on the commander's ruler

According to the coordinates of the object in kilometers and the digitization of kilometer lines, the square in which the object is located is determined. A coordinate meter is applied to this square in the same way as when determining coordinates (see Fig. 6.17), its vertical scale is aligned with the western side of the square so that against the lower side of the square there is a reading corresponding to the coordinate Xmap scale minus the digitization of that side of the square. Then, without changing the position of the coordinate meter, they find on the horizontal scale a reading corresponding (also on the map scale) to the difference in the coordinate Y object and digitizing the western side of the square. The dot against the stroke of this reference will correspond to the position of the object on the map.

On fig. 6.18 shows an example of mapping object B, located in an incomplete square, by coordinates X = 3; Y = 2.

In this case, the coordinate meter is superimposed so that its horizontal scale is aligned with the northern side of the square, and the reading against its western side corresponds to the difference in the coordinate Y object and digitization of this side (29 km 457 m - 650 km = 29 km 456 m). The reading corresponding to the difference between the digitization of the northern side of the square and the Y coordinate of the object (1 km - 650 km 3766 m) is laid down along the vertical scale. The dot against the dash at the 3765 m reference will indicate the position of the object on the map.

Author: Mikhailov L.A.

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