Any card is the reduced image of some territory. The coefficient showing as far as the image is reduced in relation to a real object is called scale. Knowing it, it is possible to define a map distance. For real-life cards on a paper basis scale – the size fixed. For virtual, electronic cards this size changes together with change of increase in the image of the card on the monitor screen.
Instruction
1. If your card on a paper basis, then find its description which is called a legend. Most often, it is in marginal registration. In a legend the card scale which will prompt to you, how many distance measured in centimeters according to this card will make in reality, on the area has to be surely specified. So, if scale is equal 1:15000, then it means that 1 cm on the card is equal 150 meters on the area. If the scale of the card is equal to 1:200000, then 1 cm, postponed on it is equal to 2 km in reality
2. the city or from one settlement to another, your route will consist of rectilinear pieces. You will move not on a straight line, and along the route passing along streets and roads.
3. Actually the distance between the initial and final point of your way will be longer, than the distance measured between the initial and final point of a way. That measurements were exact, plot a route of your movement in the form of short and long direct pieces, determine their sum and recognize the valid distance which you need to overcome by it.
4. To determine distance by the electronic card, it is possible to use one of many geoinformation programs which can be found in the Internet. There are specialized programs which transport companies use. Having set initial and the final destination, the settlement, you will be able to receive the card on which the route of your following will be put and its general distance and distance between nodal points of a route is specified.
5. The map distance can be measured by means of the Ruler tool geoinformation Google Earth and Yandex Maps packages, an underlying cause for cards in which are space satellite pictures. Just turn on this tool and click with a mouse the point noting the beginning of your route and that where you plan to finish it. The value of distance can be learned in any set units of measure.