Important 7 Terminologies used in the Surveying
We are now sharing the 7 terminologies taken from the subject 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.
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