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Principles of surveying pdf
Method of Surveying in Civil Engineering.
It is carried out if the area exceeds over 250 km2.
B) Compass Surveying Compass survey uses the principle of traversing.
G aerial Survey, in this type of survey data about large tracks of land is collected by taking photographs from an aero-plane.B hydrographic Survey, hydro-graphic survey is carried out to determine.S.L.There is no need for chaining in such survey.No angular measurements are windows 7 professional 32 bit iso full version taken, tie line and check lines control accuracy of the work.Theodolite can be used to measure: Horizontal angles Vertical angles Deflection angle Magnetic bearing Horizontal distance between two points Vertical height between two points Difference in elevation Nowadays theodolite is shadowed and replaced by the use of Total Station which can perform the same task.Angles of triangles must not be less than 30 degree and greater than 120 degree.Equilateral triangles are considered to be ideal triangles.The principle of Tacheometer is based on property of isosceles triangle, where ratio of the distance of the base from the apex and the length of the base is always constant.Advanced embedding details, examples, and help!Reconnaissance Survey, in this type of survey, data is collected by marking physical observation and some measurements using simple survey instruments.1 surveying based on Nature of Survey a topographical Surveys, they are carried out determine the position of natural features of a region such as rivers, streams, hills etc.
There are two type of photographic surveying i).
Surveys may be classified based on the nature of the field of survey, object of survey and instruments used.
They are plotted directly on paper with their relative position.
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This type of survey is carried out to gather information about sites that are important from archeological considerations and for unearthing relics of antiquity.The area to be surveyed is divided into a number of small triangles.The rays are drawn from station to object on ground.Plane surveying is done of the area of survey is less than 250 km2.Critical factors considered in identifying object of shape, sizes, patterns, shadow.