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In order to discover the meaning of the term tachymetry, it is necessary that, first, we proceed to know its etymological origin. In this case, we must determine that it is a word that derives from the Greek, since it is the result of the sum of two clearly differentiated parts such as these:
-The adjective "takhys", which can be translated as fast.
-The noun "metron", which is synonymous with measure.

Tachymetry it is the branch of topography centered on the survey of blueprints through the tachymeter (a device that allows the measurement of angles and distances).

Tachymetry is considered as a method to do measurements quickly but without too much precision. It is usually used in situations where, due to its characteristics, it is impossible to use a tape measure.

Tachimetry makes possible the measurement of horizontal or vertical distances indirectly . From the tachymeter, similar to a theodolite, it is possible to make three readings (a lower thread, another medium and a third upper thread) and, taking the value of the vertical angle, reach the measure It is intended to know.

According to system applied, you can distinguish between different types of tachymetry, such as horizontal sight tachymetry , the vertical sight tangential tachymetry and the vertical sight tachymetry .

In addition to the above, we have to establish some more information about these types of tachymetry underlined:
- Inclined tachymetry, which is undertaken in what are terrains that have different kinds of irregularities and which basically consists of using the tachymeters to perform inclined visuals.
- Horizontal tachymetry. This is characterized in that it can use both tachymeters and levels to undertake what the work is, which will be based on horizontal visual calls. Basically, the data related to the horizontal angle of the terrain, the height of the instrument and the readings of the threads, whether the medium or the ends, will be taken.

The autoreductive tachometers On the other hand, they serve to directly measure the distance that exists between two points. For this they appeal to a constant function.

It is possible to find uses of tachymetry in various works from civil Engineering . Tachymetry can be present, for example, when the construction of a highway or route . Suppose you intend to link two cities with a new road: between both points you can draw a huge number of lines. The choice of the layout will be linked to different technical issues that tachymetry can help solve, at least in relation to certain aspects, through its measurements.

No less interesting is to know another series of aspects related to tachymetry, among which we can highlight the following:
- Through it, what you get is the X, Y and Z coordinates through a single operation.
-There is what is known as tachymeter notebooks, which are those media in which professionals proceed to register the data they use and those obtained when undertaking the operation in question.

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