Important 7 Terminologies used in the Surveying

We are now sharing the 7 terminologies taken from the subject Surveying.

Important 7 Terminologies used in the Surveying

The 7 terminologies are as under

General Notes

  • The purpose of surveying is to create a plan and a map.

  • The plan is a large-scale depiction of a limited region.

  • A map is a small-scale depiction of a limited region.

  • The surveying principle

    • To start with the big picture and work my way down to the details

    • At least two measurements are required to find a new station.

  • Geodetic surveying (area > 250 km2) is when the curvature of the earth is considered.

  • Plane surveying (Area 250 km2) is when the curvature of the earth is not considered.

  • On the surface of the earth, the difference between the long arch of a circle and the subtended chord is 0.1 meters for 18.2 kilometers, 0.3 meters for 54.3 kilometers, and 0.5 meters for 91 kilometers.

  • The sum of the angles on a spherical triangle on the earth's surface and the equivalent plane triangle is 1 second per 195.5 square kilometers of land area.

  • Radians are used to measure plane angles.

  • The size of a spherical triangle is measured in steradians.

Length/links /length of each link of the Chain used for surveying

  • Metric Chain

    • 20m chain - 100 links - each link 0.2m

    • 30m chain - 150 links - each link 0.2m

  • Engineer's Chain

    • 100ft - 100 links - each link 1ft

  • Revenue Chain

    • 33ft - 16 links - each link 2.063ft

  • Gunter's Chain (Surveyor's Chain)

    • 66ft - 100 links - each link 0.66ft

  • Tolerance Limit of Chains

    • 20m chain: - ± 5mm

    • 30m chain: - ± 8mm

Tapes

  • Cloth and linen tape

    • It comes in lengths of 10m, 20m, 25m, and 30m. It isn't correct.

  • Glass fiber tape

    • This tape does not expand or contract due to changes in temperature and moisture content. More accurate than a thousand tapes.

  • Metallic tape

    • This tape is more durable than fiberglass and cloth tapes.

  • Steel tape

    • More accurate than a metal tape

  • Invar tape

    • It consists of steel (64%) and nickel (36%). It is more accurate than all other tapes.

Arrow

  • Used to indicate the position of the end of the chain from the floor.

Peg

  • Used to indicate the location of survey points and endpoints of survey lines.

Ranging Rod

  • This is used to position the midpoint so that the midpoint is on a straight line connecting the end stations.

Ranging

  • Ranging is the process of determining the intermediate positions.

So, these are the 7 terminologies and other information we have shared with you, hope you will like the article.

Thanks for reading.

Thanks,

Kumar Bhanushali



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