Surveying
In observations of equal precision, the most probable values of the observed quantities are those that render the sum of the squares of the residual errors a minimum, is the fundamental principle of

Least square method
D'Alembert's method
Legendre's method
Gauss' Mid Latitude formula

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Surveying
The First Point of Aeries

Is usually denoted by the Greek letter ?
Is the point in the celestial sphere where zero meridian crosses the celestial equator
All listed here
Is located near the very conspicuous rectangle of stars in the constellations of Pegasus and Andromeda

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Surveying
Contour interval is

Larger for accurate works
Directly proportional to the flatness of ground
Larger if the time available is more
Inversely proportional to the scale of the map

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Surveying
Systematic errors

All listed here
Can be removed by applying corrections to the observed values
Always follow some definite mathematical law
Are also known as cumulative errors

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