Measurements: Trianguliation. Angular measurements.

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Test your knowledge - what you already know about the Struve Geodetic Arc!

Which scientist is considered to be the inventor of the trinagulation measurements method (measuring a length by triangular chain)? *

1 point

Villebrord Snel van Royen

Isaac Newton

Nicolaus Copernicus

What is an essence of the triangulation method? *

1 point

A chain of equilateral triangles is formed along the line to be measured, the angles and astronomical azimuth of the triangles are measured, and the lengths of the sides of the triangles along the line are calculated.

A triangular chain is formed along the line to be measured, one side and all the angles of the triangles are measured, and the lengths of all other sides are calculated from the angular measurement results.

A chain of rectangular triangles is formed along the line to be measured, the angles and diagonals are measured, and the lengths of the sides of the required triangles are calculated.

What are benefits of triangulation chain? *

1 point

There is no need to measure distances - angles and astronomical azimuths are surveyed, while sode lenghts are calculated.

Easier terrain measurements - need to survey only one side and all angles, other side lenghts are calculated.

Higher accuracy is achieved - all sides of the triangles are measured and discrepancies are spreaded.

How the angles between the points of the Struve Geodetic Arc were measured? *

1 point

At night, focusing the instrument to lights in the adjacent points.

On cloudy days, focusing the instrument to the lights in the adjacent points

On sunny days, focusing the instrument to the red flags in the adjacent points

What is the longest arc segment in Struve Geodetic Arc? *

1 point

Over 50 km

Over 60 km

Over 80 km

What instrument Struve used for angular measurement at the arc measurements? *

1 point

Erthel universal instrument (theodolite)

Ramstein tacheometer

Reinbach universal instrument (theodolite)

Which university professor was F. G. W. Struve during the arc measurements? *

1 point

Dorpat (Tartu)

Sankt Peterbourg

Riga

In which city was the temporary Nemėžis Observatory installed during the establishment of Struve Geodetic Arc? *

1 point

Close to Rokiskis

Close to Molėtai

Close to Vilnius

What was determined by astronomical observations of the Struve Geodetic Arc? *

1 point

Earth's curvature vector according to celestial bodies

Astronomical latitude and astronomical azimuth towards next point

Astronomic coordinates

What constrain the accurate measurement of the meridian length by simple linear measuring instruments (strips, rangefinders)? *

1 point

Disparity of terrain, natural and artificial barriers (vegetation, water bodies, structures)

A lack of the methodology of such measurements and it is difficult to obtain permits to enter private property.

Earth's curvature

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