Surveying
For mapping any country

Primary triangles are broken down into secondary triangles of somewhat lesser accuracy
All listed here
Geodetic triangulation of greatest possible sides and accuracy is carried out
Secondary triangles are further broken into third and fourth order triangles, the points of which are used for detail surveys

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Surveying
Spring tides are caused when

Sun and moon are in line with earth
Solar tidal force and lunar tidal force both coincide
None of these
Solar tidal force acts opposite to lunar tidal force

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