Concetti Chiave
- Polygonals are sequences of segments that form closed or open figures on a reference surface.
- They are typically numbered counterclockwise and usually have no more than ten sides to minimize errors.
- The length of each side should be between 50-70 meters and 250-300 meters.
- Vertex angles are calculated using Bessel’s rule, while side lengths are averaged from two readings.
- Types include closed, open, oriented, and non-oriented polygonals, each serving different surveying purposes.
Polygonals are a series of sides that can generate a closed or open figure. So, they are a sequence of segments drawn on the reference surface.
Polygonals are generally numbered counterclockwise.
Normally, polygonals haven’t got more than ten sides to not increase the errors; the length of each side must not be greater than 250 - 300 meters and less than 50 - 70 meters.
Each vertex angle of the polygonal is calculated with Bessel’s rule while the extent of each side is obtained from the arithmetic mean between the reading-in and reading-out.
There are various types of polygonals:
- closed polygonals: the first point of the polygonal coincides with the last;
- open polygonals: the first point of the polygonal doesn’t coincide with the last;
- oriented polygonals: they are connected to known reference points; these types of polygonal are frequently used for cadaster and road projects;
- non-oriented polygonals: they are primarily used for the relief of land to calculate the area, because it isn’t necessary to direct the polygonal.
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