In
geodetic surveying (also called trigonometrical surveying)
it is necessary to take into account of earth, since large distances and area
are covered. Because the shape of the earth is spheroidal (generally we take it
as spherical) the lines connecting any two points on the surface of the earth
is curved or an arc of a great circle.
Scope and Use of Geodetic Surveying
Geodetic surveys are conducted with the highest degree of accuracy to provide widely spaced control points on the earth surface for subsequent plane surveys. Provision of such control points is based on the principle of surveying from the whole to the part and not from the part to the whole, as stated earlier. Geodetic surveys require the use of sophisticated instruments, accurate methods of observations and their computation with accurate adjustment. To eliminate the errors in the observations due to refraction, angular observations are generally restricted to night and arc lamps are used as signals on the survey stations.
Geodetic Surveying
Division of Geodetic Surveying
Geodetic surveying can be divided in the following ways.
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