Tuesday, June 30, 2020

Some important points related to Surveying || Important Points in surveying || #Surveying

 _*๐Ÿ“Œ▪️ _*๐Ÿ“Œ▪️Some important points related to Surveying▪️*_

▪️The *basic principle of surveying* working from whole to part

๐Ÿ‘‰ Prevents accumulation of errors and localised minor errors

▪️An Equilateral triangle is considered to be the best well conditional triangle
 ( 30° to 120° )

▪️The best shape of triangle in triangulation is isosceles with base angle 56°14'

▪️A good draftsman can plot a distance as small as a 0.25mm

▪️ Control survey for fixing the points on the boundary

▪️ land/Cadstral survey to measure the area of land ,
 To Fix the legal boundaries and to locate the reference points

▪️ Astronomical survey
Study about celestial body,
Determination of latitude and longitude.

▪️ Archaeological survey
To Know The civilization of People.

๐Ÿ‘‰The principle involved in chain survey is of triangulation

๐Ÿ‘‰ Compass survey uses the principle of traversing .

๐Ÿ‘‰The principle of plane table survey is parallelism .

๐Ÿ‘‰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 .

*▪️Least Count Of Surveying Instruments*

๐Ÿ‘‰Prismatic Compass = 30'

๐Ÿ‘‰ Surveyor Compass = 15'

๐Ÿ‘‰ Total station= 1sec

๐Ÿ‘‰Theodolite = 20"

๐Ÿ‘‰ levelling Staff = 5mm

๐Ÿ‘‰ Dummy level=5mm


 *▪️Important Points in surveying.*

๐Ÿ‘‰Horizontal plane tangential to the level surface.

๐Ÿ‘‰Level surfaces parallel to the mean spheroidal surface of the earth

๐Ÿ‘‰RL of the line of collimation is known as the height of instrument

๐Ÿ‘‰ Differential levelling also known as compound levelling or continuous levelling

๐Ÿ‘‰Fly levelling is used to connect the benchmark to the starting point of alignment of any  project

๐Ÿ‘‰ Check levelling is the fly levelling done at the end of the days work to connect the point with starting point on that particular day to check the accuracy of the days work.

#Surveying

๐Ÿ‘‰The principle involved in chain survey is of triangulation

๐Ÿ‘‰ Compass survey uses the principle of traversing .

๐Ÿ‘‰The principle of plane table survey is parallelism .

๐Ÿ‘‰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 .

๐ŸŒŸLeast Count Of Surveying Instruments

๐Ÿ‘‰Prismatic Compass = 30'
๐Ÿ‘‰ Surveyor Compass = 15'
๐Ÿ‘‰ Total station= 1sec
๐Ÿ‘‰Theodolite = 20"
๐Ÿ‘‰ levelling Staff = 5mm
๐Ÿ‘‰ Dummy level=5mm

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