You will need
- Topographic map, ruler
Look closely at the map and find the kilometer grid, which is supposed to be affixed. The sides of the squares of the grid correspond to a certain number of kilometers, to know the quantity you can signatures at the outputs of the line stacks on the edge of the card frame. For example, the distance between two adjacent grid lines is 1 km and Measure this distance with a ruler. Let's say you got 2 see So, the scale of maps: 1 cm to 500 m or 1:50000.
The second method of determining the scaleand item cards. Carefully consider the details of the card. The item is a alpha-numeric name of the map sheet. Any scales ' series has its own specific designation under which a specialist can easily determine the scale of the map. For example, the nomenclature designation M-35 means the scale of 1:1,000,000; M-35-XI denotes the scale 1:200000; M-35-18-And-6-1 – scale 1:10000, etc. of Course, to define the scaleand in this way it is necessary to have an understanding of the nomenclature and notation and some experience with topographic maps.
The third method of determining the scaleand maps at a known distance. Find on the map image milepost on the highways. Measure the map distance from one pole to the other. You immediately know the scale of the map (the number of inches of cards will match one kilometer area).
The maps scaleand 1:200000 on the road marked with distances between towns in kilometers. In this case, measure on the map with a ruler the distance in centimeters from one settlement to another, and signed a number of kilometers, divide by the distance, expressed in centimeters. So you got the value scalemaps, i.e. the number of kilometers in one centimeter.
If you are in the area, which is depicted on the map locate the scale on the measured distances. To do this, measure the distance between the mapped objects.
Use knowledge of the length of the arc of the Meridian. One minute of the Meridian is equal to approximately 2 km and more precisely is 1.85 km. On the side of the card frame this signature, degree and minute, and every minute allocated to the checkered. If, for example, the length of one minute is equal to 3.7 cm, the scale of the map is 1:50000 (one centimeter on the map equals 0.5 km on the ground).
Advice 2: How to find the scale
The scale shows how many times the card reduces the real area that it depicts. Only by knowing this value, you can defer on the map or plan of the area real distance. To know the scale can be marked on the map. If not there, calculate it according to the lines of latitude.
You will need
- - various cards;
- - the range;
If the plan or map marked the item sheet, a special table to determine the scale of the map. For example, if a map sheet is labeled M-35-A, its scale is 1:500000. This means that 1 cm on the map, the terrain is 500000 cm or 5 km.
If mark does not exist, note the kilometer grid, which is applied to any topographic map. Side of the square of this grid corresponds to a fixed number of kilometers. Measure with a ruler the side of the square in inches and find the ratio of the distance on the map to real. This will be the scale. For example, if the stack on the map at 4 km and the distance between the lines is 2 cm, then the scale will be equal to 2:4 km=2:400000 cm=1:200000 see
If the map is larger scale with Parallels, then define it by using this grid. To do this, measure the distance between the two caused by a number of Parallels in inches. These adjacent Parallels from the larger numerical values subtract the lesser. Since one degree of parallel corresponds to 111 km, directly on the ground, multiply the difference by that number, and the number 100000 in order to convert this distance to centimeters.
Find the ratio of the measured range of distance to the calculation result. Get the scale of the map. For example, if Parallels are 0?, 10?, 20? etc. find the difference of two nearby lines. She will be 10. Then, multiply this number by 111 and 100000. Get 10•111•100000=111000000. If the distance measured by the ruler is equal to 4.5 cm, will receive a scale of 4.5:111000000 cm?1:25000000, see This means that one centimeter in the map fits 250 km area.
Measure the scale of real distances. For this known distance mark on the map, and correlate with the real. For example, if the distance between the two cities is 400 km, and on the map it is equal to 8 cm, find the ratio of 8:400 miles=8:40000000=1:5000000. This is the scale of the map.